Hi,

The following code is used in example linear_elasticity/material_nonlinearity.py to evaluate the Cauchy strain during post processing:

strain = problem.evaluate('ev_cauchy_strain.i.Omega(u)', mode='el_avg')
out['cauchy_strain'] = Struct(name='output_data', mode='cell', data=strain, dofs=None)

Using ParaView to visualize the result on a tetrahedral mesh from VTK output, I find the strain to have 8 decomposition components with arbitrary names 1 through 8.
Is it possible to obtain the strain as a vector in Cartesian components?

Regards,
Radko