Choose the best option: - Viscoelastic stress relaxation - Viscoelastic creep Although the viscoelastic response of a polymer...

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Mechanical Engineering

Choose the best option:
- Viscoelastic stress relaxation
- Viscoelastic creep
Although the viscoelastic response of a polymer can be verycomplex (time-dependent stress cycling for instance), two specialloading scenarios are fairly simple to describe mathematically.
1. _ refers to scenarios for which the stress applied to apolymer must decay over time in order to maintain a constantstrain. Otherwise, over time, the polymer chains will slip andslide past one another in response to a constant applied load andthe strain will increase (in magnitude).
2. __ refers to scenarios for which a polymer willpermanently flow over time in response a constant appliedstress.

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4.2 Ratings (589 Votes)

1. Viscoelastic stress relaxation refers to scenarios for which the stress applied to a polymer must decay over time in order to maintain a constant strain. Otherwise, over time, the polymer chains will slip and slide past one another in response to a constant applied load and the strain will increase (in magnitude).

2. Viscoelastic creep refers to scenarios for which a polymer will permanently flow over time in response a constant applied stress.

1) When Viscoelastic stress relaxation occurs - step constant strain causes decreasing stress

2) When Viscoelastic creep occurs - step constant stress causes increasing strain

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