塔式起重机耳板件疲劳断裂行为研究
发布时间：2019-07-21 09:54
【摘要】：塔式起重机在受载过程中,其耳板发生断裂.为明确其断裂机制,对耳板件进行了显微组织和断口形貌观察、材料力学性能测试和有限元数值分析.结果表明:耳板材料性能满足设计要求,耳板的断裂形式为疲劳断裂,裂纹萌生于耳板内侧转折处;有限元分析得到了耳板与主弦杆的焊接构件在耳板内侧转折处存在明显的应力集中.改进主弦杆端部与耳板间的焊接方式,可以改善其应力分布状况,减小应力集中,从而有效降低构件的断裂风险.
[Abstract]:In the process of loading, the ear plate of tower crane breaks. In order to clarify the fracture mechanism, the microstructure and fracture morphology of the ear plate were observed, the mechanical properties of the material were tested and the finite element numerical analysis was carried out. The results show that the properties of the ear plate meet the design requirements, and the fracture form of the ear plate is fatigue fracture, and the crack originates from the inner turning point of the ear plate. The finite element analysis shows that the welded components of the ear plate and the main chord have obvious stress concentration at the inner turning point of the ear plate. By improving the welding mode between the end of the main chord and the ear plate, the stress distribution can be improved and the stress concentration can be reduced, thus the fracture risk of the component can be effectively reduced.
【作者单位】： 浙江工业大学材料科学与工程学院;首都航天机械公司;浙江工业大学机械工程学院;
【分类号】：TH213.3
本文编号：2517093
[Abstract]:In the process of loading, the ear plate of tower crane breaks. In order to clarify the fracture mechanism, the microstructure and fracture morphology of the ear plate were observed, the mechanical properties of the material were tested and the finite element numerical analysis was carried out. The results show that the properties of the ear plate meet the design requirements, and the fracture form of the ear plate is fatigue fracture, and the crack originates from the inner turning point of the ear plate. The finite element analysis shows that the welded components of the ear plate and the main chord have obvious stress concentration at the inner turning point of the ear plate. By improving the welding mode between the end of the main chord and the ear plate, the stress distribution can be improved and the stress concentration can be reduced, thus the fracture risk of the component can be effectively reduced.
【作者单位】： 浙江工业大学材料科学与工程学院;首都航天机械公司;浙江工业大学机械工程学院;
【分类号】：TH213.3
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