Pressure 07
Pressure 07 :
General. If a material element has zero "shear stress", then the principal stresses all share the same value; this value is the negative pressure. Any rotation of the coordinate system produces the same value for the normal stresses, hence a stress state with zero shear stress is isotropic and the stress tensor can be written as the product of the scalar quantity "pressure" and the identity matrix. Even if shear stresses are present, the isotropic component of the stress state can be extracted from the general stress tensor. The pressure is simply the average value of the three normal stresses regardless of the coordinate system orientation. See Ruff (2002)
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