卡车底盘有限元应力分析以及预测疲劳寿命

Stress Analysis of Heavy Duty Truck Chassis as a Preliminary Data for Its Fatigue Life Prediction Using FEM

应力分析在重型卡车底盘疲劳研究和确定最高应力临界点组的寿命预测中很重要.利用有限元软件ABAQUS对卡车模型进行应力分析.该模型长12.35米、宽2.45米,材料为低合金钢,屈服强度552 MPa,拉伸强度620MPa,临界点的应力大小为386.9 MPa.结果表明,应力的临界点发生在底盘上螺栓口的位置,这个临界点是疲劳开始的最高压力点.

The stress analysis is important in fatigue study and life prediction of components to determine the critical point which has the highest stress. The analysis done for a truck model by using a commercial finite element packaged ABAQUS. The model has a length of 12. 35 m and width of 2.45 m. The material of chassis is Low Alloy Steel with 552 MPa of yield strength and 620 MPa of tensile strength. The result shows that the critical point of stress occurred at the opening of chassis which is in contact with the bolt. The stress magnitude of critical point is 386.9 MPa. This critical point is an initial to probable failure since fatigue failure start from the highest stress point.