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新设计的某型号装载机后车架,在做台架试验过程中出现了断裂,针对这一情况,用美国大型有限元分析软件NASTRAN对该结构进行了强度分析。阐述了用有限元法对后车架进行强度分析的建模过程,并对分析结果进行了分析。结果表明,由于后车架设计存在缺陷,从而导致某应力集中处应力过高,而且应力过高点是在焊缝部位,这就更加增大了断裂的可能性,说明后车架存在设计缺陷是导致其断裂的主要原因。针对这一情况,设计了一种新型结构,新结构一方面避免了在关键部位存在焊缝,同时降低了最大应力值。经再一次分析表明,新结构强度比原结构有了很大提高,理论上满足设计要求。在其投入市场以来,新型后车架并未发生断裂现象,从而表明查找出的断裂原因正确,对原结构的修改合理。同时也表明所建立的有限元模型适用,分析结果可靠。
In the newly designed rear loader of a model loader, a fracture occurred during the bench test. In view of this situation, the strength of the structure was analyzed by NASTRAN, a large-scale US finite element analysis software. The modeling process of the strength analysis of the rear frame with the finite element method is expounded, and the analysis results are analyzed. The results show that due to the rear frame design defects, resulting in a stress concentration stress is too high, and the stress is too high point in the weld site, which further increases the possibility of fracture, indicating that there are design flaws rear frame Is the main reason leading to its fracture. In response to this situation, a new type of structure has been designed. On the one hand, the new structure avoids the existence of weld in the key part and at the same time reduces the maximum stress value. After another analysis shows that the strength of the new structure has been greatly improved than the original structure, in theory, to meet the design requirements. Since its introduction into the market, the new rear frame did not break, indicating that the cause of the fracture was found correctly and that the modification of the original structure was reasonable. At the same time, it also shows that the established finite element model is suitable and the analysis result is reliable.