Chapter 15: Problem 6

(a) Contrast the manner in which stress relaxation and viscoelastic creep tests are conducted. (b) For each of these tests, cite the experimental parameter of interest and how it is determined.

Short Answer

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In conclusion, stress relaxation and viscoelastic creep tests are two different methods used to study the viscoelastic behavior of materials. Stress relaxation tests involve maintaining a constant strain or deformation while monitoring the change in stress required over time, while viscoelastic creep tests involve applying a constant stress or force and observing the resulting deformation over time. The key experimental parameters are the stress in stress relaxation tests and the deformation in viscoelastic creep tests.

Step by step solution

1. Stress Relaxation and Viscoelastic Creep Tests

Stress relaxation and viscoelastic creep tests are two common methods used to study the viscoelastic behavior of materials. Stress relaxation tests involve applying a constant strain or deformation to a material and observing how the stress or force required to maintain the deformation changes with respect to time. In viscoelastic creep tests, a constant stress or force is applied to the material and the resulting strain or deformation is measured over time as the material deforms under the constant load.

2. Experimental Parameter for Stress Relaxation Tests

The experimental parameter of interest in stress relaxation tests is the stress (or force) that is needed to maintain the constant strain or deformation over time. This value is determined by monitoring the change in stress (or force) required to maintain the constant deformation, and it can be plotted against time to generate a stress relaxation curve.

3. Experimental Parameter for Viscoelastic Creep Tests

For viscoelastic creep tests, the parameter of interest is the strain (or deformation) that the material undergoes as a result of the constant stress or force applied to it. This value is determined by measuring the deformation of the material and plotting it against time, producing a creep curve. To summarize, stress relaxation tests focus on how the stress (or force) required to maintain a constant deformation changes over time, while viscoelastic creep tests concentrate on the deformation of a material subjected to a constant stress (or force), and how it evolves over time.

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(a) Contrast the manner in which stress relaxation and viscoelastic creep tests are conducted. (b) For each of these tests, cite the experimental parameter of interest and how it is determined.

Short Answer

Step by step solution

1. Stress Relaxation and Viscoelastic Creep Tests

2. Experimental Parameter for Stress Relaxation Tests

3. Experimental Parameter for Viscoelastic Creep Tests

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