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本文选择车轮轮辐疲劳试验装置为力学模型,应用SAP5结构分析程序对EQ140汽车车轮进行了有限元分析,给出了轮辐在弯矩载荷作用下的应力分布规律。我们首次提出应变辐值法,根据两次有限元计算结果,可以方便地求出轮辐在旋转弯矩载荷作用下,其通风孔边缘处切向的最大应变值,该计算结果与车轮轮辐疲劳试验装置上的试验结果相符合,证明计算结果精确可靠,应变幅值法是正确的。应用应变幅值法可以代替车轮轮幅疲劳试验进行应力分析,为轮辐的优化设计提供依据。
In this paper, the wheel spoke fatigue test device is selected as the mechanical model. The SAP5 structural analysis program is used to analyze the wheel of EQ140 with finite element method. The stress distribution law of the spokes under the moment load is given. For the first time, we put forward the strain radiation method. According to the results of two finite element calculations, the maximum strain at the edge of the vents of the spokes under the rotating moment load can be easily obtained. The calculation results are in good agreement with the wheel spoke fatigue test The test results on the device are consistent, proving that the calculation result is accurate and reliable and the strain amplitude method is correct. The application of strain amplitude method can replace the fatigue test of wheel spokes for stress analysis and provide the basis for the optimal design of spokes.