Characterization of Crack Tip Mechanical Field of Inhomogeneous Materials in Welded Joints by USDFLD Subroutine

Table 1

Elastic-plastic material property with yield strength changing in the x-direction.

Yield strength distribution	Group	Mismatch coefficient Mx	Yield strength gradient in transition zone Gx (MPa/mm)	Yield strength of base metal σBM (MPa)	Yield strength of weld metal σWM (MPa)
x-direction	Sandwich structure model	1	—	400	400
		0.25	—	533	267
		0.5	—	640	160
	USDFLD subroutine model	—	0	400	400
		—	133	533	267
		—	240	640	160