Relatório rESISTENCIA DOS MATERIAIS

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UNIVERSIDADE de SÃO PAULO FACULDADE DE ZOOTECNIA E ENG. DE ALIMENTOS Departamento de engenharia de alimentos Resistência dos Materiais Aula Prática 3 e 4: Relatório Condensado Grupo 9 Diurno: Anelisa de Andrade (7653784) Érika Borges(7129312) Milena Ferrini(7653485) Mônica Higa (7653662) Raissa Gripp (7653505) 1

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RESISTENCIA DOS MATERIAIS

Transcript of Relatório rESISTENCIA DOS MATERIAIS

UNIVERSIDADE de SO PAULO

FACULDADE DE ZOOTECNIA E ENG. DE ALIMENTOS

Departamento de engenharia de alimentos

Resistncia dos Materiais

Aula Prtica 3 e 4:

Relatrio Condensado

Grupo 9 Diurno:

Anelisa de Andrade (7653784)

rika Borges(7129312)

Milena Ferrini(7653485)

Mnica Higa (7653662)

Raissa Gripp (7653505)

Julho, 2014

Sumrio1Ensaio 1 Determinao de Fluncia de embalagens alimentcias41.1Objetivo41.2Fundamentao terica e conceitos41.2.1Embalagens41.2.2Fluncia51.3Materiais e mtodos61.4Resultados e discusso71.5Concluso101.6Referncias112Ensaio 2 Determinao da tenso e da energia de cisalhamento de embutidos112.1Objetivo122.2Fundamentao terica e conceitos122.3Materiais e mtodos142.4Resultados e discusso142.5Concluso162.6Referncias173Ensaio 3 Determinao de tenso na ruptura em embalagens pelo teste de perfurao.173.1Objetivo173.2Fundamentao terica e conceitos173.3Materiais e mtodos183.4Resultados e discusso183.5Concluso203.6Referncias214Ensaio 4 Determinao de relaxao em queijos.214.1Objetivo214.2Fundamentao terica e conceitos214.2.1Queijos214.2.2Relaxao224.3Materiais e mtodos234.4Resultados e discusso244.5Concluso254.6Referncias26

Ensaio 1 Determinao de Fluncia de embalagens alimentcias

Objetivo

O objetivo dessa aula foi comparar o comportamento viscoelstico de fluncia entre as embalagens avaliadas e entre as posies de ensaio. Correlacionar a microestrutura e o comportamento de fluncia delas, alm de discutir os modelos tericos de viscoelasticidade que melhor descrevem o comportamento das embalagens e discutir a importncia do teste de fluncia para embalagens alimentcias.

Fundamentao terica e conceitosEmbalagens

As embalagens plsticas atendem principalmente aos setores alimentcio,

de higiene e limpeza, cosmticos, farmacutico e industrial, e so divididas em flexveis, rgidas e sacaria de rfia. Allm de embalar, estes tm as funes de atrair a ateno, descrever as caractersticas do produto, criar confiana do consumidor e produzir uma impresso global favorvel. Alguns clientes priorizam o design, a funcionalidade e a qualidade, como no caso das indstrias alimentcias, de cosmticos, e farmacutica. Portanto, embalagens bem desenhadas podem criar valor de convenincia para o consumidor, e valor promocional para o fabricante dos bens de consumo.(PADILHA e BOMTEMPO, 1999).

As empresas ao perceberem que as embalagens podem representar a diferena entre os produtos, investem fortemente no design como cores e formas, procurando criar uma identidade prpria para seus produtos, atravs das embalagens. (NARAYANAN, 1991)

No setor alimentcio, h uma demanda muito grande por embalagens prticas, com funes de facilidade de abertura e fechamento, e com capacidade de permitir a preparao do produto na prpria embalagem, por exemplo, por cozimento ou por aquecimento em forno de microondas. Estes conceitos demandam designs de embalagens muito particulares e especficos para cada aplicao, que tambm necessitam de materiais com caractersticas especficas, como de resistncia ao calor e propriedades mecnicas apropriadas (LANGE e WYSER, 2003).

Para obteno dos produtos petroqumicos bsicos, a cadeia produtiva de produtos plsticos tem incio na utilizao das matrias primas nafta ou gs natural. Os produtos petroqumicos bsicos, provenientes da primeira gerao, so transferidos para as empresas da segunda gerao, as quais iro transform-los em resinas plsticas. Estas resinas so transformadas em plsticos, em geral, atravs de processos de extruso, injeo, sopro, e outros, resultando numa grande diversidade de produtos, que atendem aos mais diversos setores da economia (PADILHA e BOMTEMPO, 1999).

Fluncia

A fluncia, conhecida na literatura por sua terminologia inglesa (creep), consiste de um ensaio onde uma tenso de intensidade constante aplicada ao material e a deformao resultante registrada em funo do tempo.(GUNASEKARAN & AK, 2003). Conforme o tempo avana, a deformao plstica (tenso) pode exceder a limitao estrutural e ocorre a ruptura.

Figura 1.2.2.1: Frmula para fluncia (STEFFE, 1996)

Para Tabilo-Munizaga (2005), o ensaio de fluncia pode ser usado para comparar ou prever o comportamento do material. Ao realizar uma srie de ensaios de fluncia em diferentes nveis de tenso, e plotando um grfico de viscosidade x tenso, o campo de tenso aparente representado pelo ponto de mudana abrupta da viscosidade.

Figura 1.2.2.2: O campo de equilbrio da tenso pelo ensaio de fluncia em diversos alimentos (Tabilo-Munizaga, 2005)

A fluncia em termoplsticos um fenmeno que depende tanto das propriedades do material (molecular orientao, cristalinidade) quanto de parmetros externos (tenso, temperatura e umidade). Uma anlise de fluncia essencial se os compsitos termoplsticos da fibra polipropileno precisam ter aplicaes de carga de longo prazo. (HOUSHYAR, 2005)

Materiais e mtodos

Com o auxlio de um micrmetro, mediu-se a espessura da embalagem de estudo, assim como, com uma rgua mediu-se o comprimento til da tira que foi alocada entre as garras do dispositivo de trao.

Fazendo-se uso de um texturmetroTA XT2i, como dispositivo de trao, aplicou-se uma fora constante de 10N por 5 minutos de modo a se obter como resultado a plotagem do grfico Fora x Deformao, possibilitando , a posteriori, aferies a respeito da embalagem de estudo.

Resultados e discusso

Com os valores obtidos do deslocamento do dispositivo de trao e a medio do tempo (de 0 a 300s) aps a realizao do experimento, construiram-se os grficos abaixo, para os dois tipos de embalagem (BB 2800 e BB 494) em ambas as direes (Pr e Contra).

Grfico 1. Deslocamento por tempo para embalagem BB2800

Grfico 2. Deslocamento por tempo para embalagem BB494

Para obteno dos grficos Deformao x Tempo, foi realizado o clculo atravs da seguinte frmula, no qual divide-se o deslocamento pela espessura :

E foram plotados os grficos 3 e 4.

Grfico 3. Deformao por tempo para embalagem BB2800

Grfico 4. Deformao por tempo para embalagem BB494

Ao analisar o comportamento do material, pode-se concluir que ele apresenta comportamento de um slido visco-elstico, no qual h uma continuidade do aumento da deformao, enquanto a taxa de variao de deformao decresce com o tempo. Esse tipo de caracterstica ocorre no modelo reolgico de Kelvin, no qual a tenso constante e h um aumento na deformao, que registrada em funo do tempo.

Ao fazer uma anlise de ambas as embalagens nas diferentes orientaes, foi possvel visualizar maiores valores de deslocamento e deformao na orientao PRO (sentido das nervuras da embalagem) em relao orientao CONTRA (sentido oposto s nervuras da embalagem) ao longo do tempo.

E especificamente para a embalagem BB 2800, observou-se uma diferena significativa no comportamento das orientaes PRO e CONTRA. J a embalagem BB 494, apresenta maior deslocamento e deformao na orientao PRO, porm so diferenas muito ligeiras.

A embalagem com maior fluncia a BB 494 com orientao a favor de suas nervuras. Isso significa que h maior deformao com o tempo, portanto, um material mais suscetvel a danos. Visto que nosso material uma embalagem de alimento, isso se torna um fator negativo, pois podem ocorrer danos nos alimentos, se a embalagem no estiver de acordo com a legislao, segura e apresentando uma boa resistncia contra impactos e foras externas.

A embalagem mais eficiente, isto , com menor fluncia, a embalagem BB 2800 com orientao contra suas nervuras.

A avaliao adequada e um controle de qualidade eficiente das embalagens na indstria alimentcia se tornam extremamente importantes, pois apesar da embalagem apresentar baixa deformao ao ser aplicado nela uma fora, os alimentos, que estaro dentro dela podem sofrer danos e se deterioraram, dependendo da intensidade da fora.

Concluso

Conclui-se que as embalagens BB494 E BB2800 possuem propriedades viscoelsticas, como foi possvel observar atravs dos grficos e fez-se uma observao final de que o material mais resistente fluncia foi o BB 2800 na orientao contra as nervuras.

Referncias

CABRAL, Antonio Carlos Dantas et al. Apostila de embalagem para alimentos. Campinas, 1984. 335 p.

DOZDROV, A.D. Finite eleasticity and viscoeleasticity: a course in the nonlinear mechanics of solids. Massachusettes, Word scientific publishing Co. Pte.Ltd, 1996, 150p.

HOUSHYAR, S., SHANKS, R.A., Hodzic, A.: "Tensile creep behaviour of polypropylene fibre reinforced polypropylene composites", Polym Test., Vol. 24, n 2 (2005), pp. 257-264.

NARAYANAN, P. V. Packing advertising marketing. Packing India. p.13 -7, 1991

PADILHA, G.M. A; BOMTEMPO, J.V; A Insero dos Transformadores de Plsticos na Cadeia Produtiva de Produtos Plsticos, Polmeros v.9 n.4 So Carlos, 1999

SANTOS, J.P.L. Anlise de modelos reolgicos viscoelsticos atravs de formulaes mistas em elementos finitos. Rio de Janeiro, 2008. 135p. Dissertao (Mestre em Cincias em Engenharia Civil) Coordenao dos Programas de Ps-Graduao de Engenharia Universidade Federal do Rio de Janeiro, Rio de Janeiro. 2008.

Ensaio 2 Determinao da tenso e da energia de cisalhamento de embutidos

Objetivo

Medir e comparar as foras de cisalhamento para dois tipos de embutidos: salsicha e presunto.

Fundamentao terica e conceitos

A textura e a maciez so termos relacionados percepo sensorial e esto ligados impresso subjetiva. Os estmulos envolvidos na percepo da textura so predominantemente mecnicos, podendo ento, empregar anlises objetivas da textura fazendo uso de equipamentos capazes de avaliar diversos parmetros reolgicos. Essas anlises fornecem grficos de fora em razo do tempo ou distncia, conhecido como perfis de textura ou curvas de deformao (RAMOS, GOMIDE, 2007).

Para medir propriedades mecnicas de um alimento e correlacionar com aspectos sensoriais, necessrio ter conhecimento das bases da formao da mecnica (RAMOS, GOMIDE, 2007).

Quando um corpo de prova submetido foras externas, diferentes tipos de foras internas podem ser distinguidas. Dentre essas foras tem-se, o cisalhamento, que a fora que tende a deformar ou distorcer o material. A tenso de cisalhamento expressa em fora por unidade de rea, sendo essa rea aquela paralela direo das foras de atuao (RAMOS, GOMIDE, 2007).

As tcnicas instrumentais so amplamente empregadas para tentar medir a resistncia de produtos crneos aos efeitos mecnicos durante a mastigao, em que a fora de cisalhamento atuante. Os equipamentos denominados texturmetros so utilizados para avalias os parmetros reolgicos e relacion-los com a textura do alimento (RAMOS, GOMIDE, 2007).

Figura 2.2.1: Ilustrao e esquematizao de um texturmetro.

O teste de cisalhamento realizado no texturmetro mede a fora necessria para se cortar um alimento com uma lmina. A fora mxima ou a energia (rea sob a curva de deformao) necessria para cisalhar a amostra so avaliadas e tomadas como a medida de maciez do produto (RAMOS, GOMIDE, 2007).

Figura 2.2.2: Curva tpica de deformao

Materiais e mtodos

Com o auxlio de um paqumetro, mediu-se o dimetro e o comprimento do corpo-de-prova, o qual consistia de uma amostra cilndrica de presunto. Em seguida, colocou-se a amostra com a seo circular na mesma direo de aplicao da fora, na base do dispositivo do texturmetro.

A posteriori, fazendo-se uso do TexturmetroTA XT2i, dotado de guilhotina, realizou-se o teste de cisalhamento. Para a realizao correta deste ensaio ajustou-se o dispositivo e calibrou-se a clula de carga do equipamento.

Resultados e discusso

A tabela abaixo mostra os valores de dimetro e de rea de seo transversal medidos:

Dimetro (mm)

rea (mm2)

Presunto

15,13

179,79

Salsicha

23,00

415,48

Tabela 2.4.1: Valores de dimetro e rea de cada amostra

Com os dados obtidos durante o procedimento experimental, foi possvel plotar o seguinte grfico de fora x deslocamento para cada amsotra:

Grfico 2.4.1: Fora x deslocamento para o presunto

Analisando o Grfico 2.4.1 de fora x deslocamento para o presunto, pode-se notar que inicialmente h um aumento da fora, o qual resultado da resistncia ao cisalhamento que a parte externa da amostra oferece, uma vez que a parte externa mais dura do que a parte interna.

A fora mxima atingida, que pode ser vista pelo grfico, foi de 14,35N.

O clculo da tenso mxima de cisalhamento foi feito pela seguinte equao:

Dessa forma, a tenso mxima de cisalhamento do presunto foi de 79,81KPa.

A energia de cisalhamento foi obtida calculando a rea sob a curva no grfico de fora x deslocamento, e dividindo esse resultado pela rea cisalhada da amostra. A energia de cisalhamento calculada foi de 873,15J/m2.

Grfico 2.4.2: Fora x deslocamento para a salsicha

Analisando o Grfico 2.4.2 de fora x deslocamento da salsicha, pode-se perceber o mesmo comportamento observado para o presunto, ou seja, inicialmente h um aumento da fora, que resultado da resistncia ao cisalhamento que a parte externa da amostra oferece.

A fora mxima atingida, que pode ser vista pelo grfico, foi de 18,12N.

O clculo da tenso mxima de cisalhamento forneceu um valor de 43,62KPa.

A energia de cisalhamento calculada foi de 515,95J/m2.

Fazendo-se uma correlao entre a energia de cisalhamento e tenso de cisalhamento com a mastigao, pode-se dizer que quanto maiores os valores de energia de cisalhamento e tenso, maiores sero a energia e a fora empregada durante a mastigao. Assim, pelos ensaios realizados, pode-se dizer que o presunto consome mais energia para mastigar, uma vez que ele possui a maior energia de cisalhamento.

Concluso

Pode-se concluir que os ensaios para determinao da tenso de cisalhamento em embutidos so de grande importncia na indstria de alimentos, pois atravs desses ensaios possvel fazer uma correlao entre parmetros mecnicos com propriedades sensoriais, e assim, avaliar caractersticas intrnsecas dos produtos.

Referncias

RAMOS, E. M., GOMIDE, L. A. M. Avaliao da Qualidade de carnes Fundamentos e metodologias. Viosa, MG: Editora UFV, 2007.

Ensaio 3 Determinao de tenso na ruptura em embalagens pelo teste de perfurao.

Objetivo

Determinar a tenso de ruptura em embalagens atravs do teste de perfurao.

Fundamentao terica e conceitos

As propriedades mecnicas de filmes so caractersticas bastante importantes para manter a integridade da estrutura do produto, bem como promover a sua proteo fsica. Assim, de grande valia realizar testes de perfurao, que permitem conhecer as propriedades mecnicas dos filmes (FONSECA, 2012).

Os ensaios de perfurao so realizados em equipamentos denominados texturmetros. O teste de perfurao mede a fora necessria para penetrar uma sonda cilndrica ou agulha, de dimetro conhecido, no corpo de prova a uma determinada profundidade (RAMOS, GOMIDE, 2007).

O teste de perfurao fornece dados da fora exercida em funo da distncia e do tempo, permitindo assim, calcular a fora na ruptura e a deformao na ruptura. A deformao da ruptura pode ser calculada pela seguinte equao:

Materiais e mtodos

Para a determinao da tenso de ruptura em embalagens foi utilizado o texturmetro TA XT2i, com uma sonda cilndrica de 3mm de dimetro. As amostras de filmes BB494 e BB2800 foram cortadas em discos de 60 mm de dimetro.

Os discos foram fixados no suporte vazado e em seguida foram medidos trs vezes o dimetro utilizando o paqumetro. Mediu-se tambm a espessura dos filmes em 5 pontos diferentes atravs do micrmetro digital. Colocou-se a amostra no suporte e iniciou-se o teste de perfurao.

Resultados e discusso

O teste de perfurao foi realizado nas embalagens BB494 e BB2800, cujas espessuras medidas foram de 0,03mm e 0,04mm, respectivamente.

Sabendo que o dimetro mdio de 39,56mm, possvel calcular a deformao de ruptura, com a seguinte relao: , sendo d: profundidade de penetrao; rm: raio mdio; Dm: dimetro mdio. Os valores obtidos foram enunciados na Tabela 1 abaixo.

rm (mm)

Dm (mm)

Espessura (mm)

%

BB494

19,78

39,56

0,03

3,96

BB2800

19,78

39,56

0,04

3,95

Tabela 3.4. 1: Dados da deformao de ruptura

Com os dados acima pode-se concluir que a embalagem BB2800 sofreu uma menor deformao na ruptura, sendo mais resistente em comparao embalagem BB494.

Atravs dos dados obtidos pelo equipamento possvel obter curvas de forca (N) x deslocamento de perfurao (mm) para as embalagens analisadas, evidenciando a fora mxima de ruptura, representadas nos grficos 2 e 3 abaixo.

Grfico 3.4.1: Perfurao BB494 (Fora x Deslocamento de perfurao)

Grfico3.4. 2: Perfurao BB2800 (Fora x Deslocamento de perfurao)

A partir dos grficos foi possvel identificar a fora mxima de ruptura para as embalagens BB494 e BB2800, sendo Fmx BB494 = 18,779798 n E Fmx BB2800 = 28,11536 N.

Atravs da fora mxima possvel calcular a tenso de ruptura (resistncia perfurao), utilizando a seguinte frmula : , sendo que a rea da sonda cilndrica com 3mm de dimetro 7,065 x 10-6 m. Com isso, obtm-se os valores de BB494 = 2,66 MPa e BB2800 = 3,98 MPa.

Visto que a rea da sonda cilndrica a mesma para as duas embalagens, quanto maior a fora, maior a tenso de ruptura. Com isso, a embalagem BB2800 suporta uma fora aplicada de maior intensidade, sendo mais resistente.

A funo primordial da embalagem visa a proteo do produto contra danos fsico-mecnicos que ocorrem durante seu transporte e distribuio e tambm desempenha papel fundamental na segurana do produto. Sua danificao em possveis contaminaes, perda da integridade do produto, perda de caractersticas sensoriais, que podem diminuir sua vida til ou contaminar o alimento.

Assim, a embalagem no pode sofrer nenhum tipo de alteraes fsicas, tais como ruptura, por possuir papel fundamental na manuteno da integridade do alimento, garantindo sua qualidade. Sendo assim, o teste de perfurao se mostra muito til para a determinao de embalagens adequadas.

Concluso

Para determinao da fora de ruptura em embalagens o teste de perfurao se tornou eficiente, visto que possvel calcular a fora mxima atravs dos grficos construdos. Comparando a anlise das embalagens BB494 e BB2800 a que se mostrou mais eficiente foi a BB2800 por suportar uma maior fora, ou seja, foi mais resistente quando comparada a BB494.

Referncias

FONSECA, J.P.C.G.Q. Revestimentos comestveis base de quitosano e cera de abelha: aplicao na conservao da uva de mesa. Lisboa, 2012 Dissertao para a obteno do Grau de Mestre em Engenharia Alimentar Instituto Superior de Agronomia, Universidade Tcnica de Lisboa, Lisboa. 2012. Disponvel em : .

Ensaio 4 Determinao de relaxao em queijos.

Objetivo

O objetivo dessa aula foi discutir o comportamento mecnico atravs da anlise da curva tenso x tempo entre os queijos e descrever o modelo reolgico mais apropriado para avaliar o comportamento dos queijos. Alm disso, correlacionar a relaxao e a consistncia do queijo e compreender a importncia deste ensaio para o controle de qualidade de alimentos semelhantes ao queijo.

Fundamentao terica e conceitos

Queijos

O estudo da deformao e o escoamento de materiais slidos e fluidos, em resposta a ao de uma fora denominado reologia. Para materiais slidos, o termo deformao, como o caso dos queijos semiduros, e para materiais lquidos, utiliza-se o termo escoamento, como o caso do requeijo cremoso (ANJO, 2000).

As propriedades reolgicas de queijo so importantes para identificar um queijo e determinar sua qualidade, pois a textura usada para diferenciar a grande variedade de queijos que existem, bem como um meio de estudar a sua estrutura de acordo com a sua composio e as tcnicas de processamento utilizadas. (MAGENIS, 2014)

Do ponto de vista fsico, o queijo denominado um alimento viscoelstico, pois durante uma deformao, parte da energia mecnica fornecida para a ele armazenada (parte elstica) e parte dissipada (parte viscosa) (LUCEY et al., 2003).

De acordo com Shoemakeret al. (1992), a avaliao das propriedades reolgicas dos queijos to importante quanto avaliao do sabor e aroma. Sua composio, microestrutura (arranjo estrutural dos componentes), estado fsico-qumico e interao de seus componentes e sua macroestrutura (presena de olhaduras e fissuras) determinam as propriedades reolgicas dos queijos, portanto a variao nestes parmetros pode promover alteraes significativas no comportamento reolgico do queijo (FOX et al.,2000).

Relaxao

Existem, em reologia, dois ensaios bsicos para medir o comportamento viscoelstico de materiais: relaxao (relaxation) e fluncia (creep). Dozdrov (1996) afirma que para um material ser considerado viscoelstico, necessrio que este experimente o fenmeno de fluncia ou de relaxao.

No ensaio de relaxao de tenso, a amostra submetida instantaneamente a uma deformao que mantida constante durante todo o tempo de ensaio. A amostra responde com uma tenso que registrada com o tempo. (Steffe, 1996)

Figura 3: Frmula para relaxao (STEFFE, 2006)

Em uma curva de relaxao tpica ocorre uma queda exponencial da tenso at um valor constante, diferente de zero. No caso de alimentos importante que a deformao aplicada seja pequena para minimizar a ocorrncia de alteraes estruturais no material (CUNHA, 2002).

Del Nobile, Chillo, Mentana, e Baiano (2007) utilizaram o modelo de Maxwell generalizado para descrever o comportamento de relaxao de tenso de alimentos slidos como carne, queijo curado e queijo mussarela.

Materiais e mtodos

Os materiais utilizados no experimento foram: sonda cilndrica com 20 mm de dimetro, texturmetro TA XT2i, corpos-de-prova cilndricos de queijo e paqumetro.

Inicialmente, atravs de um paqumetro, foram medidos em 3 direes diferentes a altura e o dimetro dos corpos-de-prova, calculando-se uma mdia referente cada quesito de medidas.

Logo aps, o corpo-de-prova foi comprimido at atingir 25% de deformao por meio do teste de relaxamento, com uma velocidade de 5 mm/s. Manteve-se nesta posio por aproximadamente 5 minutos. Terminado o ensaio, mediu-se novamente as dimenses dos corpos-de-prova, como ilustrado na figura 1.

Figura 4.3.1: Ensaio de relaxamento

Resultados e discusso

Para o teste de relaxao em queijos foram medidos os dimetros das amostras de provolone e mussarela, obtendo os valores de 2,2 cm e 2,1 cm, respectivamente.

Para uma analise mais detalhada, os grficos 3 e 4 de tenso x tempo foram construdos atravs dos dados fornecidos pelo equipamento utilizado, cuja rea de seo transversal foi de 0,00037994 para o provolone e de 0,000346 para a mussarela.

Grfico 4.4.1: Relaxao em provolone (tenso x tempo)

Grfico 4.4.2 : Relaxao em mussarela (tenso x tempo)

Em laticnios, estudos reolgicos so realizados como mtodo de controle de qualidade e estudo da estrutura do produto. A compresso do comportamento reolgico de qualquer alimento importante durante sua fabricao, como controle de qualidade, caracterizao e desenvolvimento de produtos e relao entre estrutura e propriedade de textura (NETO, 2006)

O ensaio de relaxao mais comumente utilizado em estudos de queijo a compresso.

Quando uma deformao instantnea constante aplicada em um material viscoelstico, como queijo, a tenso necessria para manter essa deformao diminui com o tempo. Uma curva de relaxao tpica ocorre com uma queda exponencial da tenso at um valor constante, diferente de zero.

No teste de relaxao, a amostra submetida a uma deformao instantnea, sendo mantida ao longo do experimento. Isso mostra a maneira como a amostra reage em relao tenso aplicada. Assim, quanto menor a resistncia deformao, maior a maciez do queijo.

Assim, de grande importncia que a deformao seja pequena para minimizar a ocorrncia de alteraes estruturais no alimento (SILVA, 2013).

Concluso

Com isso, o teste de relaxao de grande importncia na fabricao de queijos, pois est relacionado com sua consistncia, sendo que, quanto menor a resistncia deformao, maior a maciez do queijo.

Assim, pode-se minimizar a ocorrncia de alteraes sensoriais no alimento, aumentando sua qualidade e consequentemente, a aceitabilidade pelo consumidor.

Referncias

ANJO,V.D.A. Reologia de requeijo cremoso e outros queijos fundidos. In: VAN DENDER, A. G. F. et al. Requeijo Cremoso e Outros Queijos Fundidos: Aspectos de Qualidade, Processamento, Rotulagem, Legislao e Mercado. Seminrio ITAL/TECNOLAT, Campinas, cap.12, 2000.

CUNHA, C.R. Efeito do uso de retentados de baixo fator de concentrao no rendimento, protelise e propriedades viscoelsticas de queijo Minas Frescal de reduzido teor de gordura. Campinas, 2002. 118p. Dissertao (Mestrado em Engenharia de Alimentos) Faculdade de Engenharia de Alimentos, Universidade Estadual de Campinas, Campinas. 2002.

Del Nobile, M. A., Chillo, S., Mentana, A., & Baiano, A. (2007). Use of the generalized Maxwell model for describing the stress relaxation behavior of solid-like foods. Journal of Food Engineering, 78, 978983.

FOX, P.F.; GUINEE, T.P.; COGAN, T.M.; McSWEENEY, P.L.H. Fundamentals of Cheese Science. Maryland: Ed. Aspen Publication, 2000, 587 p

GUNASEKARAN, S.; AK, M.M. Cheese Rheology and Texture. CRC Press LLC, Florida, 2003, 637p.

LUCEY, J.A.; JOHNSON, M.E.; HORNE, D.S. Invited review: Perspectives on the basis of the rheology and texture properties of cheese. Journal of Dairy Science, v.86, n.9, p.2725-2743, 2003.

Magenis, R.B.; Prudncio, E.S.; Fritzen-Freire, C.B.; Stephan, M.P.; Silvio do Egito, A.; Daguer, H. Rheological, physicochemical and authenticity assessment of Minas Frescal cheese. Food Control 2014, 45, 22.

SHOEMAKER, C.F.; NANTZ, J.; BONNANS, S.; NOBLE, A.C. Rheological

characterization of dairy products. Food Technology, v. 46, n. 1, p. 98-104. 1992.

Steffe, J.F. 1996. Rheological Methods in Food Process Engineering, Second Edition. Freeman Press, East Lansing, Michigan.

TABILO-MUNIZAGA, G.; BARBOSA-CNOVAS, G. V. Rheology for the food industry. Journal of Food Engineering,v. 67, p. 147-156, 2005.

Distncia x Tempo (BB2800)

2800 CONTRA04.0000000000000022E-28.0000000000000043E-20.120000000000000020.160.20.240000000000000160.280000000000000080.32000000000000040.360000000000000320.40.440.480000000000000320.520.560000000000000050.600000000000000640.640000000000000790.680.720000000000000640.760000000000000790.80.840000000000000640.880.920.9600000000000006311.041.081.12000000000000011.15999999999999861.21.241.281.321.361.41.441.481.521.561.61.64000000000000011.68000000000000131.721.761.81.841.88000000000000011.92000000000000131.960000000000001322.042.082.122.162.20000000000000022.24000000000000022.27999999999999982.31999999999999722.362.42.442.482.522.562.62.642.682.722.76000000000000022.82.842.882.922.9633.043.083.123.163.23.243.28000000000000023.323.363.43.443.483.523.563.63.643.683.723.76000000000000023.83.843.883.923.9644.044.084.11999999999999664.15999999999999754.24.244.284.31999999999999854.35999999999999854.40000000000000044.44000000000000044.48000000000000044.51999999999999964.55999999999999964.59999999999999964.63999999999999974.684.724.764.84.844.884.924.9655.045.085.11999999999999665.15999999999999755.25.245.285.31999999999999855.35999999999999855.45.445.485.525.565.65.645.685.725.765.85.845.885.925.9666.046.086.11999999999999666.15999999999999756.26.246.286.31999999999999856.35999999999999856.46.446.486.526.566.66.646.686.726.766.86.846.886.926.9677.047.087.11999999999999667.15999999999999757.27.247.287.31999999999999857.35999999999999857.47.447.487.527.567.67.647.687.727.767.87.847.887.927.9688.04000000000000098.088.1200000000000018.168.20000000000000118.248.28000000000000118.328.36000000000000488.48.448.488.528.568.68.648.688.72000000000000068.768.80000000000000078.848.88000000000000088.928.960000000000002699.04000000000000099.089.1200000000000019.169.20000000000000119.249.28000000000000119.329.36000000000000489.49.449.489.529.569.69.649.689.72000000000000069.769.80000000000000079.849.88000000000000089.929.96000000000000261010.04000000000000110.0810.12000000000000110.1610.20000000000000110.2410.2810.3210.3600000000000110.410.4410.4810.5210.5610.610.6410.6810.7210.7610.810.8410.8810.9210.961111.0411.0811.1211.1611.211.2411.2811.3211.3600000000000111.411.4411.4811.5211.5611.611.6411.6811.7211.7611.811.8411.8811.9211.961212.0412.0812.1212.1612.212.2412.2812.3212.3600000000000112.412.4412.4812.5212.5612.612.6412.6812.7212.7612.812.8412.8812.9212.961313.0413.0813.1213.1613.213.2413.2813.3213.3600000000000113.413.4413.4813.5213.5613.613.6413.6813.7213.7613.813.8413.8813.9213.961414.0414.0814.1214.1614.214.2414.2814.3214.3600000000000114.414.4414.4814.5214.5614.614.6414.6814.7214.7614.814.8414.8814.9214.961515.0415.0815.1215.1615.215.2415.2815.3215.3600000000000115.415.4415.4815.5215.5615.615.6415.6815.7215.7615.815.8415.8815.9215.961616.0416.07999999999998816.1216.1616.216.23999999999998816.27999999999998716.3216.3616.39999999999999916.43999999999998716.47999999999998616.5216.55999999999999916.60000000000000116.6416.6816.7216.76000000000000216.816.8416.8816.92000000000000216.9599999999999871717.0417.07999999999998817.1217.1617.217.23999999999998817.27999999999998717.3217.3617.39999999999999917.43999999999998717.47999999999998617.5217.55999999999999917.60000000000000117.6417.6817.7217.76000000000000217.817.8417.8817.92000000000000217.9599999999999871818.0418.07999999999998818.1218.1618.218.23999999999998818.27999999999998718.3218.3618.39999999999999918.43999999999998718.47999999999998618.5218.55999999999999918.60000000000000118.6418.6818.7218.76000000000000218.818.8418.8818.92000000000000218.9599999999999871919.0419.07999999999998819.1219.1619.219.23999999999998819.27999999999998719.3219.3619.39999999999999919.43999999999998719.47999999999998619.5219.55999999999999919.60000000000000119.6419.6819.7219.76000000000000219.819.8419.8819.92000000000000219.9599999999999872020.0420.07999999999998820.1220.1620.220.23999999999998820.27999999999998720.3220.3620.39999999999999920.43999999999998720.47999999999998620.5220.5620.620.6420.6820.7220.75999999999998720.820.8420.8820.91999999999998720.9599999999999872121.0421.0821.1221.1621.221.2421.27999999999998721.3221.3621.421.43999999999998721.47999999999998621.5221.5621.621.6421.6821.7221.75999999999998721.821.8421.8821.91999999999998721.9599999999999872222.0422.0822.1222.1622.222.2422.27999999999998722.3222.3622.422.43999999999998722.47999999999998622.5222.5622.622.6422.6822.7222.75999999999998722.822.8422.8822.91999999999998722.9599999999999872323.0423.0823.1223.1623.223.2423.27999999999998723.3223.3623.423.43999999999998723.47999999999998623.5223.5623.623.6423.6823.7223.75999999999998723.823.8423.8823.91999999999998723.9599999999999872424.0424.0824.1224.1624.224.2424.27999999999998724.3224.3624.424.43999999999998724.47999999999998624.5224.5624.624.6424.6824.7224.75999999999998724.824.8424.8824.91999999999998724.9599999999999872525.0425.0825.1225.1625.225.2425.27999999999998725.3225.3625.425.43999999999998725.47999999999998625.5225.5625.625.6425.6825.7225.75999999999998725.825.8425.8825.91999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