电弧喷涂修复曲轴多轴疲劳寿命计算

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In order to quantitatively study crankshaft fatigue life repaired by arc spraying, the tensile test of the 48MnV with 3Crl3 coatings is conducted, the method proposed by Baumel Jr. and Seeger is used to estimate fatigue parameters of the material. And the fatigue life of crankshaft repaired arc spraying is calculated and assessed. The loads in each link neck are obtained through dynamic simulation, among which spring units are used to simulate the actual elastic support status in the spindle neck and the boundary conditions are adjacent cranks interaction. Then, the Crankshaft fatigue life is calculated using multiaxial damage model, respectively using the normal strain law, the SWT-Bannantine approaches, shear strain method and Fatemi-Socie method. Finally, the engine bench strengthen tests of the new axis, respectively 500 h, 1 000 h and 3 000 h are conducted. And the crankshaft after the engine bench strengthen test is cut into cranks on which the fatigue tests are carried out. The test results match the calculation results.为了定量研究电弧喷涂修复后曲轴的疲劳寿命，对具有3Crl3涂层的48MnV材料进行了拉伸实验，利用BaumelJr．和Seeger提出的方法估算了该材料的循环疲劳特性参数，并将其应用到电弧喷涂后修复曲轴的疲劳寿命评估计算中。通过动态仿真获取各连杆颈上的载荷，将其作为曲轴的载荷，同时利用弹簧单元对主轴颈处的弹性支撑实际状况进行了模拟，相邻拐影响作为边界条件，进行了有限元分析模拟。利用多轴损伤模型并分别采用正应变法、SWT―Bannantine、剪应变法、Fatemi―Socie法对曲轴的寿命进行了计算。对新的曲轴分别进行500h、1000h、3000h发动机台架强化实验，然后将强化实验后的曲轴截成单拐并进行了单拐疲劳实验。实验结果与计算结果吻合。