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Different between pressure and stress tensor plot in solid mechanics

Posted Mar 30, 2012, 4:18 a.m. EDT Modeling Tools & Definitions, Parameters, Variables, & Functions, Structural Mechanics Version 4.2a 1 Reply

Andrew Tan
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Hi, Dear all,

Currently study solid mechanics in comsol, may i know what is difference when i plot the structure in terms pressure and stress tensor? i thought both of them are the same.

Is the stress tensor in comsol refer to Cauchy stress?

Thank you.
1 Reply Last Post Mar 30, 2012, 8:59 a.m. EDT
Nagi Elabbasi Facebook Reality Labs
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Posted: 1 decade ago Mar 30, 2012, 8:59 a.m. EDT
Pressure is a scalar can be calculated from the stress tensor as P= -(S11+S22+S33)/3. The stress tensor may be Cauchy, first Piola-Kirchhoff or second Piola-Kirchhoff stress tensor. In geometrically nonlinear problems COMSOL outputs all of them I believe.

Nagi Elabbasi
Veryst Engineering
Pressure is a scalar can be calculated from the stress tensor as P= -(S11+S22+S33)/3. The stress tensor may be Cauchy, first Piola-Kirchhoff or second Piola-Kirchhoff stress tensor. In geometrically nonlinear problems COMSOL outputs all of them I believe. Nagi Elabbasi Veryst Engineering

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