Unsymmetrical Crack-Tip Stress-Strain Field and Its Engineering Treatment Method of Mixity Parameters of Welded Joint

Considering the stress-strain field distribution rules of welded joint containing a crack on fusion line,the calculation procedures of mixity parameter M^P is discussed on unsymmetrical strain-stress yield.And furthermore,the fracture parameter COD is decomposed into two parts of modeⅠand ModeⅡ components.By the finite element method,the mixity angle φ of mixed-mode is calculated and the result is analyzed on the condition of different lording levels.In the end,for the engineering treatment,the calculating method of the mixity angle φ,which can be used for the mixed mode of the asymmetric cracked stress-strain field of welded joints,are given also.