Rheological Deformation Properties of AB Materials

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FINAL EXAMINATION 593273279

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Grace Balahay

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Rheological Deformation Properties of AB Materials


Rheological Deformation Properties of AB MaterialsOnline version FINAL EXAMINATION 593273279 by Grace Balahay 1 Most of the materials that experienced deformation in the presence of stress in considered to follow the a Hookean behavior b law of elasticity c viscoplastic properties d viscoelastic 2 occurs when a material is held between two parallel plates, one of which is moving with respect to the other. a Shearing b stretching c stressing 3 is defined as the force applied perpendicular to the plane per unit area. a Normal stress b Shear stress c Torsion stress d True stress 4 is the stress component tangential to the plane on which the forces act, the force is parallel to the sample surface. A good example to this is the spreading of butter over a slice of toast bread, brushing of barbecue sauce on chicken, or stirring of a hot cup of cocoa. a Shear stress b True stress c Torsion stress d Normal stress 5 is the shear stress on a traverse cross section resulting from a twisting action. a Torsion stress b Normal stress c Torsion stress d True stress 6 is the axial stress in a tension or compression test, calculated on the basis of the instantaneous cross sectional area instead of the original area. a True stress b Torsion stress c Shear stress d Normal stress 7 is the unit change in size or shape of a material referred to its original size or shape when a force is applied. It is expressed as a Strain b stress c deformation d shear strain 8 is the change in length per unit length in the direction of the applied normal stress: a Normal strain b shear strain c dilatational stress or strain d deviatoric stress or strain 9 is defined as the change in the angle formed between two planes that are orthogonal prior to deformation as a result of the application of stress a Shear strain b normal strain c dilatational stress or strain d deviatoric stress or strain 10 causes change in volume. a dilatational stress or strain b deviatoric stress or strain c Plastic strain d Degree of elasticity 11 is the one that results in change in shape. a deviatoric stress or strain b dilatational stress or strain c Degree of plasticity d Degree of elasticity 12 The normal stresses and strains that usually cause volume changes are called a dilatational b Degree of elasticity c deviatoric d Dilatation 13 while pure shear stresses, which tend to distort the shape of a sample while causing negligible changes in volume a deviatoric b Dilatation c dilatational d Plastic strain 14 is a strain that is not recovered during unloading a Plastic strain b Elastic strain c Degree of elasticity d Degree of plasticity 15 is a strain that recovered during unloading a Elastic strain b dedgw c d 16 is the ratio of plastic strain to total strain when a material is loaded to a certain load and then unloaded a Degree of plasticity b cdcew c d 17 is the ratio of elastic strain to total strain a Degree of elasticity b vfwefet c d 18 is a material showing elastic behavior, that is, when the stress is applied to this material, it will deform finitely but then return to its original position after the stress is removed. Foods that follow Hookeans law are dry pasta, egg shells, and hard candies when subjected to small strains a Hookean solid b nrtgerg c d 19 is a material showing brittle factures or nonlinear behavior when the stress is applied to it and will not return back to its original position after the stress is removed. a Non-Hookean solid b vefwe c d 20 is an extremely important graphical measure of a material's mechanical properties . It explains and visualizes how a material undergoes. a Stress-strain curve b fgrfere c d 21 is used to describe the relationship between the shear stress and shear strain. a Shear modulus or modulus of rigidity b vdcd c d 22 is the term used if the force is applied from all directions which results in a volume change. It is expressed as (K) a Bulk modulus (K) b vewd c d 23 is defined as the ratio of the strain in the direction perpendicular to the applied force to the strain in the direction of the applied force a poisson's ratio b becwd c d 24 is defined as the point at which an increase in deformation is observed with a decrease or no change of force. In some agricultural products, the presence of this bioyield point is an indication of initial cell rupture. a bioyield point b ceww c d 25 is a point on the stress strain or force-deformation curve at which the axially loaded specimen ruptures under a load. Rupture point corresponds to a failure in the macrostructure of the specimen while bioyield point corresponds to a failure in the microstructure of the sample. a rupture point b sdwe c d 26 are materials that show both viscous and elastic properties. a Viscoelastic materials b wrwrw c d 27 The typical food example for viscoelastic fluids a wheat flour dough b bfefe c d 28 When a viscous fluid is agitated, the circular motion causes a vortex. If a viscoelastic fluid is stirred by a rotating rod it tends to climb the rod, which is known as the a Weissenberg effect b bfver c d 29 Another phenomenon observed in the viscoelastic material is called a recoil phenomenon b nrtgre c d 30 If food materials are deformed to a fixed strain and the strain is held constant, the stress required to maintain this strain decreases with time. a Stress Relaxation Test b Creep Test c Dynamic Test (Oscillatory Test) d Elastic (Spring) Model 31 If a constant load is applied to biological materials and if stresses are relatively large, the material will continue to deform with time a Creep Test b Elastic (Spring) Model c Stress Relaxation Test d Dynamic Test (Oscillatory Test) 32 either rate is controlled (stress is measured at a constant strain) or stress is controlled (deformation is measured at a constant stress amplitude) a Dynamic Test (Oscillatory Test) b Creep Test c Stress Relaxation Test d Viscous (Dashpot) Model

Rheological Deformation Properties of AB Materials

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Rheological Deformation Properties of AB MaterialsOnline version

by Grace Balahay

Most of the materials that experienced deformation in the presence of stress in considered to follow the

occurs when a material is held between two parallel plates, one of which is moving with respect to the other.

is defined as the force applied perpendicular to the plane per unit area.

is the stress component tangential to the plane on which the forces act, the force is parallel to the sample surface. A good example to this is the spreading of butter over a slice of toast bread, brushing of barbecue sauce on chicken, or stirring of a hot cup of cocoa.

is the shear stress on a traverse cross section resulting from a twisting action.

is the axial stress in a tension or compression test, calculated on the basis of the instantaneous cross sectional area instead of the original area.

is the unit change in size or shape of a material referred to its original size or shape when a force is applied. It is expressed as

is the change in length per unit length in the direction of the applied normal stress:

is defined as the change in the angle formed between two planes that are orthogonal prior to deformation as a result of the application of stress

causes change in volume.

is the one that results in change in shape.

The normal stresses and strains that usually cause volume changes are called

while pure shear stresses, which tend to distort the shape of a sample while causing negligible changes in volume

is a strain that is not recovered during unloading

is a strain that recovered during unloading

is the ratio of plastic strain to total strain when a material is loaded to a certain load and then unloaded

is the ratio of elastic strain to total strain

is a material showing elastic behavior, that is, when the stress is applied to this material, it will deform finitely but then return to its original position after the stress is removed. Foods that follow Hookeans law are dry pasta, egg shells, and hard candies when subjected to small strains

is a material showing brittle factures or nonlinear behavior when the stress is applied to it and will not return back to its original position after the stress is removed.

is an extremely important graphical measure of a material's mechanical properties . It explains and visualizes how a material undergoes.

is used to describe the relationship between the shear stress and shear strain.

is the term used if the force is applied from all directions which results in a volume change. It is expressed as (K)

is defined as the ratio of the strain in the direction perpendicular to the applied force to the strain in the direction of the applied force

is defined as the point at which an increase in deformation is observed with a decrease or no change of force. In some agricultural products, the presence of this bioyield point is an indication of initial cell rupture.

is a point on the stress strain or force-deformation curve at which the axially loaded specimen ruptures under a load. Rupture point corresponds to a failure in the macrostructure of the specimen while bioyield point corresponds to a failure in the microstructure of the sample.

are materials that show both viscous and elastic properties.

The typical food example for viscoelastic fluids

When a viscous fluid is agitated, the circular motion causes a vortex. If a viscoelastic fluid is stirred by a rotating rod it tends to climb the rod, which is known as the

Another phenomenon observed in the viscoelastic material is called

If food materials are deformed to a fixed strain and the strain is held constant, the stress required to maintain this strain decreases with time.

If a constant load is applied to biological materials and if stresses are relatively large, the material will continue to deform with time

either rate is controlled (stress is measured at a constant strain) or stress is controlled (deformation is measured at a constant stress amplitude)