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Understanding Yield Stress Measurements

Published 03 November 2015 | By Malvern Panalytical

Many complex fluids, such as network forming polymers, surfactant mesophases, emulsions etc do not flow until the applied stress exceeds a certain critical value, known as the yield stress. Materials exhibiting this behavior are said to be exhibiting yield flow behavior. The yield stress is therefore defined as the stress that must be applied to the sample before it starts to flow. Below the yield stress the sample will deform elastically (like stretching a spring), above the yield stress the sample will flow like a liquid.

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Understanding Yield Stress Measurements