Abstract
Aiming to solve the crack problem at the connection between the metal diaphragm of the casting crane and the lower cover plate and web, a three-dimensional model of solid-shell coupling of a single main beam is established according to the design drawing of the casting crane, and the crack propagation was simulated using the expansion finite element method (XFEM). The results show that during the crack propagation process at the joint between the diaphragm and the web, the magnitude of the equivalent stress intensity factor ΔKeff is not much different from the magnitude of the type I crack stress intensity factor ΔKI during crack growth at the junction of diaphragm and web weld. The amplitudes of Type II and Type III stress intensity are smaller than those of Type I and equivalent stress intensity factors. In the process of fatigue cracking of the weld between the diaphragm and the web, the type I cracks dominate the role, and the type II and III cracking models have little effect on the connection between the diaphragm and the web.
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