PA049_橡胶悬置疲劳寿命的有限元分析及实验验证-赵建才_审稿.pdfVIP

橡胶悬置疲劳寿命的有限元分析及实验验证 赵建才 吴定凯 马力红 建新赵氏集团有限公司研发中心 摘要：为了解决橡胶悬置在汽车运行时出现的疲劳断裂问题，提高其疲劳寿命，应用MSC.MARC 软件 对橡胶悬置的结构进行了分析。计算结果表明疲劳断裂最容易出现在橡胶层与内、外金属的交界面上， 较大改变内衬套形状和使用硬度较高NR60A 橡胶材料能有效减少应变集中现象，提高悬置的疲劳寿命。 在 MTS 振动实验台分别对改进前后的橡胶悬置进行疲劳实验和在 MTS 弹性体试验机上测试改进后的 橡胶悬置的静、动态性能特性。通过对比改进前后橡胶悬置的疲劳寿命，验证了改进后的悬置结构的疲 劳寿命是原有悬置的5.6 倍，同时，改进后悬置的静、动态性能特性也符合设计要求。 关键词：悬置元件,疲劳断裂，有限元分析,静、动态性能特性，疲劳寿命 中图分类号：U463;TP391; 文献标识码：A Finite Element Analysis and Experimental Validation of the fatigue life of the rubber mount Zhao Jiancai （RD Center , Jianxin Zhao’s Group Co. Ltd, Zhejiang 315615 ） Abstract: In order to solve the fatigue fracture problem of rubber mount during test drive, MSC.MARC Software is used to analyze the structure of rubber mount. The results imply that the fatigue fracture usually appears in the interfaces of rubber layer and metal layer. Changing the shape of the bush and use of NR60A rubber material can decrease the convergence of strain and increase the fatigue life of the rubber mount. Experiments include fatigue test conducted in MTS vibration test-bed and static and dynamic performance tests conducted in MTS elastomer test system. Through the comparison of the fatigue life between the existing mount and the improved mount, the fatigue life of the improved mount is 5.6 times of that of the existing mount. Moreover, the static and dynamic performance of the improved mount accords with the requirements of the design. KEY WORDS: rubber mount, fatigue fracture, finite element analysis, static and dynamic performance, fatigue life 1.引言 轿车橡胶悬置元件安装于发动机固定支架与车架之间，这些悬置元件由于长期承受来自发动机的 循环载荷，容易产生疲劳裂纹进而断裂。如果这类悬置元件失效，则无法吸收车辆行驶中的颠簸，发动 机运转时将发生整车振抖，严重影响汽车的正常行驶。