Multiaxial Fatigue Analysis of Casting Crane Considering Wheel Pressure Loads
The metal structure of casting crane is a typical complex welding structure.Under the combined action of moving wheel pressure load and complex weld geometry,fatigue cracks often appear in several unconventional locations.In view of the intensive fatigue damage problem in the connection area of T-shaped steel and small rib plate under the main beam track of an in-service casting crane,the Soild-Shell mixed element and sub-model technology were used to establish the fine finite element model for crack area.The complete stress change process of the whole metal structure under the action of moving wheel pressure load was simulated,and the obvious multiaxial characteristics of the crack area were analyzed.The multiaxial fatigue model based on the critical plane method were used to calculate and discuss the fatigue performance of the crack area.The results show that the multiaxial stress is the main reason for the initiation of cracks at the crack area,and the F-S multiaxial fatigue model can effectively evaluate the fatigue performance of the crack area.
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