湿式多片离合器翘曲特性模拟与试验

Simulation and experiment for warp characteristic of wet multiple disc clutches

根据湿式离合器摩擦片实际几何尺寸和约束情况,建立摩擦副温度场、应力场耦合模型和对流换热系数模型。应用ANSYS/LS-DYNA软件对摩擦副进行瞬态热结构耦合分析,对过载试验中产生的对偶钢盘热弹性失稳现象进行数值模拟。揭示了热点在对偶钢盘周向和2个摩擦表面上的分布情况,分析了热弹性失稳现象中对偶钢盘应力应变的分布,并对其应力分布规律进行测试。结果表明,局部热点和接触压力有相互促进作用,温度梯度产生的热膨胀和应力集中引起对偶钢盘的翘曲,热弹性失稳导致的热衰退使对偶钢盘破坏失效。

Based on the real size and constrain of the wet clutch, the friction pair of temperature, stress fields coupling model, and the heat convection coefficient model are established. The transient thermal-structural coupling and the thermoelastic instability of the phenomenon of friction discs generated in overload tests are numerically simulated and analyzed with ANSYS/LS-DYNA. Additionally, the distribution of the hot spots in the circle direction and surface of the friction discs are revealed, the distribution of the stress and strain caused by the thermoelastic instability is analyzed and tested. The results show that hot spots and contact pressure are mutual promotion. The thermal expansion and stress concentration caused by temperature gradient lead to steel disc warp. The heat fading caused by the thermoelastic instability leads to steel disc failure.