Yield Stress

Yield Stress


Hi this is Joseph Hodges for the Rheology Lab. In the context of semisolids, what we rheologists describe as
structured liquids, yield stress is the stress at which material significantly
begins to flow. From pump specification, comparisons of spread ability or
assessing the capability of the product to suspend large particles, yield stress
is a highly important metric for predicting handling behaviour of
structured materials. You can think of yield stress as how hard would I need to
push the material before it stops bouncing back. There are multiple ways of
measuring yield stress. The modulus crossover point, the stress at a phase
angle of 45 degrees and the onset point are three common methods our lab uses
depending on the situation. In this real-world example, our high-powered
realtors show that under very low stresses, orange juices and smoothies
possess an incredibly delicate elastic structure and do undergo a yielding
behavior on application of sufficient stress.

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