The influence of material properties on the $\bm Q $-stress value near the crack tip for elastic-plastic materials

In the paper, the values of the $ Q$-stress determined for various elastic-plastic materials for single edge notched specimens in bending (SEN(B)) are presented. The influence of the yield strength, the work-hardening exponent and the crack length on the $ Q$-parameter is tested. The numerical results are approximated by closed form formulas.