基于有限元的制动模架静强度与疲劳强度分析

Analysis of static strength and fatigue strength of brake frame based on finite element method

以某动车组车下悬挂式制动模架为研究对象,对4种超常载荷组合工况以及4种运营载荷组合工况进行仿真分析。依据EN12663标准和相关设计要求,进行制动模架的静强度分析;依据EN12663和BS7608等相关疲劳设计标准,进行制动模架的疲劳强度分析。结果表明,在4种超常载荷组合工况下,工况2的Mises峰值应力最大,应力值为233.6 MPa,节点位于制动模架横梁与中间板连接焊缝处,该值小于模架基于安全系数S修正后的许用应力300 MPa,因此该模架的静强度满足要求;在4种运营载荷组合工况下,工况2的最大主应力峰值最大,应力值为29.65 MPa,节点位于制动模架横梁与中间板连接焊缝处,该值小于BS7608标准中F级焊接接头疲劳许用应力40 MPa,由此可以评定该模架的疲劳强度符合标准。

Taking the suspension brake frame of a motor vehicle group as the research object,4 kinds of combinations of exceptional load cases and 4 kinds of combinations of operational load cases were analyzed by finite element analysis. According to EN12663,the static strength of brake frame was analyzed. Based on WN12663 and BS7608,the fatigue strength was analyzed. The results showed that： under 4 kinds of combinations of exceptional load cases,the Von. Mises stress 233.6 MPa in the second. Kind of condition was maximum and did not appear to exceed the allowable stress 300 MPa are corrected by assurance factors. So ,the static strength was qualified. Under 4 kinds of combinations of operational load cases,the maximum principal stress 29.65 MPa in the second kind of condition was maximum and did not exceed allowable fatigue stress 40 MPa of class F weld joints,is proposed in BST608. So,the fatigue strength of brake frame was qualified.