Effective stress and strain in finite deformation

Abstract

Whether the concept of effective stress and strain in elastic-plastic theory is still valid under the condition of finite deformation was mainly discussed. The uni-axial compression experiments in plane stress and plane strain states were chosen for study. In the two kinds of stress states, the stress-strain curve described by logarithm strain and rotated Kirchhoff stress matches the experiments data better than the curves defined by other stressstrain description

Quantitative full-field strain measurements by SAOED (SrAl2O4:Eu2+,Dy3+) mechanoluminescent materials

“…Analogously, a certain state under multiaxial strains yields an effective strain to be matched with a ML light intensity. The effective strain is a scalar value defined as follows [25] where e eff is the effective strain, e , 11 e 22 , and e 33 are the normal strain components, and g , 12 g , 23 and g 13 are the engineering shear strain components. For the first reference test under a uniaxial tensile stress state, the effective stress becomes…”