1. Guangdong Special Equipment Testing and Research Institute for Lifting Machinery and
Vehicle Inspection, Guangzhou 510000, China;2. School of Materials and Energy,
Guangdong University of Technology, Guangzhou 510006, China
Abstract：Aiming at the fatigue issues of steel girder structure of crane, three groups of samples made of steel used for crane were selected for testing. Three positions were marked in middle scale distance part of each group of samples. The specimens were then subjected to tensile tests. Coercivity tests were performed before and after stretching. The tensile test process was simulated, and the simulated stress cloud map was compared with the coercivity cloud map. The test and simulation results showed that the value of coercive force (Hc) of the material increased gradually with the increase of external stress. The value of coercive force showed the trend of periodic change, which was possibly related to the pinning effect of residual stress due to the dislocation inside the material. The coercive force cloud map showed that the internal crystal structure of sample was destroyed with varying degrees of damage, and meanwhile, the coercive force increased accordingly. The coercivity and strain data were analyzed theoretically to obtain the fitting curve and fitting equation between the coercivity and strain.
2022, Vol. 40 
