Stress Deviator Tensor
The stress tensor can be expressed as the sum of two other stress tensors:
- a mean hydrostatic stress tensor or volumetric stress tensor or mean normal stress tensor, which tends to change the volume of the stressed body; and
- a deviatoric component called the stress deviator tensor, which tends to distort it.
So:
where is the mean stress given by
Note that convention in solid mechanics differs slightly from what is listed above. In solid mechanics, pressure is generally defined as negative one-third the trace of the stress tensor.
The deviatoric stress tensor can be obtained by subtracting the hydrostatic stress tensor from the stress tensor:
Read more about this topic: Stress (mechanics)
Famous quotes containing the word stress:
“Like all weak men he laid an exaggerated stress on not changing ones mind.”
—W. Somerset Maugham (18741966)