干片式制动器加压机构塑性变形有限元模拟

Finite element simulation of plastic deformation for dry disc brake pressurized structure

为了揭示高温和材料类型对制动器机构塑性变形的影响,采用有限元方法对38CrSi和GCr15等典型材料和高温条件下的加压机构塑性变形规律进行研究。建立了弹子加压机构的显式动力学有限元模型,给出了典型材料力学性能随温度的变化曲线。研究了典型载荷下的弹子等结构应力应变随时间的演化规律。对高温高压情况下的加压机构塑性变形规律进行研究,对比了1Cr13、40Cr、30CrMnSiA和38CrSi材料的加压机构弹塑性变形性能。结果表明,最大等效应力随着挤压载荷的增加而增加。当载荷从240 kN增加到480 kN时,转动盘由弹性变形转变到塑性变形状态。480 kN载荷情况下,转动盘在200和300℃时的塑性应变分别为100℃时的1.49倍和3.10倍。高温情况下,38CrSi在480 kN时出现了0.002的塑性应变,而1Cr13则在高达720 kN时才会产生塑性应变。

To reveal the influence of high temperature and materials type on the plastic deformation of the brake structure,the plastic deformation rules of the pressurized structure were investigated with typical materials including 38 CrSi and GCr15 at high temperature using the finite element method. The explicit dynamics finite element model of marble pressurized structure was established,and the evloution curves of mechanical properties with temperature of typical materials were given. The evolution of stress and strain of marbles under typical loads with time was studied. The plastic deformation rules of pressurized structure under high temperature and high pressure were studied,and the elastic-plastic deformation performances of 1 Cr13,40 Cr,30 CrMnSiA and 38 CrSi pressurized structure were compared. The results show that the maximum equivalent stress increases with the increase of extrusion load. The deformation type for the rotary disc changes from elastic deformation to plastic deformation when the load increases from 240 k N to 480 k N. When the load is 480 k N,the plastic strain of the rotary disc at 200 and 300 ℃ is 1. 49 and 3. 10 times more than that at 100 ℃,respectively. At high temperature,the plastic strain of 0. 002 appears at 480 k N for 38 CrSi,while for 1 Cr13,the plastic strain appears at 720 k N.