Stress Rates in Continuum Mechanics and Computer Codes.
Technical rept. 1 Nov 84-1 Apr 86,
S-CUBED LA JOLLA CA
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The concept of an objective frame indifferent stress rate is introduced. The behavior of several objective stress rates in a material undergoing simple extension is discussed. The response of a hypoelastic material in simple shear, in both the elastic and elaticplastic regimes, is evaluated, and it is concluded that for materials with low yield strength, such as metals and geologic materials, use of the Jaumann stress rate is justified. Keywords Stress Rates Objectivity Constitutive Relations Frame Indifference Plasticity.