基于受力分析的制动鼓耦合分析

Brake drum coupling analysis based on stress analysis

针对制动鼓在使用过程中出现的因温度上升而引起的摩擦系数非稳定性下降、制动力矩降低以及因热应力导致的制动鼓表面出现径向裂纹,致使制动鼓断裂失效等问题,基于对制动鼓的受力分析,将结构和受力情况比较复杂的制动鼓模型进行了有效地简化,并建立了模型,采用有限元分析法得出了在150℃时制动鼓的位移分布图和热应力分布图,以及在不考虑热效应下的位移和应力分布图。通过对制动鼓外侧、内壁及摩擦片接触区域的耦合分析,检验了在机械载荷和热载荷共同作用下,制动鼓的最大应力与材料强度极限之间的关系。研究结果表明,尽管温度对制动鼓的变形和强度有很大影响,制动鼓的强度要求仍然能够被满足,研究结果为制动鼓的结构优化及进一步的系统动力分析奠定了基础。

Aiming at the temperature rising in the working process of the brake drum, the friction coefficient drops unsteady, braking torque reduces, and the fracture failure of the brake drum happens for the surface radial crack of the brake drum caused by thermal stress, based on the results of stress analysis, the brake drum model with complex structure and stress was simplified and established. By analyzing the finite element（FE） model, displacement distribution nephogram and thermal stress nephogram were obtained at 150 ~C ,as well as the displacement distribution and stress nephograms, with the regardless of thermal effect. By coupling analysis of the contact area on the outer side and the inner wall of the brake drum and the friction plate, on the interaction of mechanical load and thermal load, the relationship between the maximum stress and the material strength limit of the brake drum. The results indicate that, though the thermal load has a significant impact on the displacement and strength of the brake drum was inspected, the strength requirements of the brake drum can still be met. The research findings lay a foundation for the structure optimization and further dynamic analysis.