TY - JOUR

T1 - Strain Dependence of the Uniaxial Compression Response of Vegetable Shortening

AU - Gonzalez-Gutierrez, Joamin

AU - Scanlon, Martin G.

PY - 2013/6/25

Y1 - 2013/6/25

N2 - Many soft food materials, including vegetableshortening, exhibit complex rheological behavior. For short-ening, a precise determination of rheological behavior isnecessary to understand its functionality as a food ingredient.Commercial vegetable shortening was subjected to mono-tonic and cyclic uniaxial compression tests at a wide range ofloading rates. The elastic modulus determined from unloadingwas a function of strain, varying between 740 kPa in theshortening’s strain hardening region to 220 kPa at large strainwhere perfect plasticity had developed. Visual analysis ofshortening specimens during the compression process showedthat a rate-dependent stress overshoot was attributable to thedevelopment of a shear band following strain hardening. Anelastoviscoplastic constitutive model was developed to definethe complex rate-dependent compression response of vege-table shortening. Using the fundamental parameters obtainedfrom the different types of compression tests, the proposedmodel accurately predicted the uniaxial compression responseof vegetable shortening over a wide range (three decades) ofcompression rates. A model with predictive capabilities oflarge strain properties is desirable because shortening is sub-ject to large strain in essentially all applications.

AB - Many soft food materials, including vegetableshortening, exhibit complex rheological behavior. For short-ening, a precise determination of rheological behavior isnecessary to understand its functionality as a food ingredient.Commercial vegetable shortening was subjected to mono-tonic and cyclic uniaxial compression tests at a wide range ofloading rates. The elastic modulus determined from unloadingwas a function of strain, varying between 740 kPa in theshortening’s strain hardening region to 220 kPa at large strainwhere perfect plasticity had developed. Visual analysis ofshortening specimens during the compression process showedthat a rate-dependent stress overshoot was attributable to thedevelopment of a shear band following strain hardening. Anelastoviscoplastic constitutive model was developed to definethe complex rate-dependent compression response of vege-table shortening. Using the fundamental parameters obtainedfrom the different types of compression tests, the proposedmodel accurately predicted the uniaxial compression responseof vegetable shortening over a wide range (three decades) ofcompression rates. A model with predictive capabilities oflarge strain properties is desirable because shortening is sub-ject to large strain in essentially all applications.

KW - Vegetable shortening

KW - Mechanical properties

KW - Elastoviscoplastic material

KW - Elastic modulus

KW - Microstructure

KW - Rheological properties

U2 - 10.1007/s11746-013-2285-1

DO - 10.1007/s11746-013-2285-1

M3 - Article

VL - 90.2013

SP - 1319

EP - 1326

JO - The journal of the American Oil Chemists' Society

JF - The journal of the American Oil Chemists' Society

SN - 0003-021X

IS - 9

ER -