冲击载荷下铸造起重机主梁疲劳裂纹扩展寿命研究

RESEARCH ON FATIGUE CRACK PROPAGATION LIFE OF CASTING CRANE GIRDER UNDER IMPACT LOAD

铸造起重机是冶金工业中常用起重运输装备,其工况环境恶劣,出现故障引发的事故危害较大,对该类装备进行准确的力学性能及疲劳分析显得非常重要。针对200/63 t四梁四轨双小车铸造起重机,建立其合理的桥架三维模型与动力学模型,基于实际载荷特性及动态参数分析,通过合理的结构简化与边界条件设置,运用Ansys软件对起重机桥架进行瞬态动力学分析。在获取准确的主梁结构危险单元应力动态响应的基础上,结合线弹性断裂力学理论,开展冲击载荷下主梁疲劳裂纹扩展寿命研究,为起重机结构优化与可靠性设计提供理论依据。

Casting crane is widely used as hoisting and conveying equipment in the metallurgical industry. The bad and failure working environment caused remarkable accident harm,so mechanical properties and fatigue analysis accurately on this equipment seem very important. Establishing bridge＇s 3D model and dynamic model reasonably for the 200 /63 t crane which made up by four beams,runways and double trolley. Base on the actual load characteristics and dynamic parameter analysis,and finishing the transient dynamic analysis in the ANSYS software for the bridge crane through structure simplify reasonably and boundary conditions. On the basis of obtaining accurate stress dynamic response with the dangerous girder structure,and then combine with the theory of linear elastic fracture mechanics theory,addressing the fatigue crack propagation life of beans under impact load. This study provide the theory basis for the structure optimization and reliability design of crane.