基于nCode design-life的某钢结构吊车梁疲劳可靠性

Based on nCode design-life in fatigue reliability analysis of a steel structure crane beam

近年来对吊车梁的调查显示,由于吊车梁的受力复杂,钢吊车梁在往复载荷作用下会提前出现不同程度的疲劳裂缝,危害生产安全与降低经济效益,疲劳寿命的研究可以有效的预防和减小破坏等问题的概率并可对于寿命进行延长.本文采用S-N方法,运用ANSYS有限元软件与nCode Design-life疲劳软件相结合的方式,通过对目标吊车梁的实际受力状态进行模拟并对其进行疲劳可靠性分析,找出最易破坏的节点及最不利位置.取吊车梁一端为基准,设置电葫芦在吊车三个不同位置的工况进行分析,得出三组此破坏点的循环数据,其最小循环值则为吊车梁往复载荷后的最易损坏处.

In recent years, according to a survey of crane beam, the complexity of the stress of the crane beam which under reciprocating load will appear different degree of fatigue cracks, which endangers the safety of production and reduces the economic benefits. The fatigue life of the study can effectively prevent, reduce the damage probability and can be extended for life. With the By S-N method and by combining ANSYS finite element software and nCode Design-software combination of fatigue life, this paper simulated the real stress state of the crane beam, and analyzed the fatigue reliability, and then obtained the most easily damaged node and position. By taking one end of the beam as a benchmark, the working conditions at three different positions of the crane are analyzed. Through three groups of the breakdown point circulation data, the minimum cycle value is the most easily damaged area after loading crane beam.