Hello,
My work is related to creep in ceramics. Often I find the relation between the creep strain rate and stress as:
creep_strain_rate = constant x stress x other_factors (1)
"stress" is a general term here. Sometimes this relation (1) is applied along the principal stress direction; stress then refers to principal stress. In other cases stress is used to represent the effective stress which is expressed as following (not sure if this is complete/correct definition):
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