基于电液压伺服系统的连杆疲劳寿命试验分析研究  

Experimental Analysis of Connecting Rod Fatigue Life Based on Electro-Hydraulic Servo System

作　　者：何昌德[1,2] 吴锋[1] 

机构地区：[1]浙江大学动力机械及车辆工程研究所,杭州310027 [2]台州科技职业学院机电工程系,台州318020

出　　处：《内燃机工程》2013年第2期30-34,共5页Chinese Internal Combustion Engine Engineering

基　　金：国家自然科学基金重点资助项目(50235030);国家自然科学基金资助项目(50776078)

摘　　要：利用德国INSTRON的电液压伺服系统对国产4G15系列发动机连杆进行疲劳寿命试验研究,对连杆疲劳极限的载荷分级和初次试验载荷的确定提出了一种新的优化方法。研究结果表明:按材料的有限循环应力所对应载荷级的高一级载荷开始测试,将试验样本由30根减至24根,就能准确测试出连杆的S-N曲线,并通过试验结果的推算,确定了在90%置信度下,存活率为90%和99.9%时的连杆疲劳极限分别为33 kN和29.7 kN,拉伸和压缩安全系数分别为1.65和1.35。A new optimization method for determination of connecting rod fatigue limit load classification and the initial test load, based on Germany INSTRON Electro-Hydraulic Servo System was proposed in fatigue life test of Series 4G15 Engine connecting rod. The results show that beginning the test from limited cyclic stress load, a grade higher than corresponding material finite cyclic stresses, the connecting rod S-N curve can be exactly measured, and sample number is reduced from 30 to 24. Based on these data, the results are calculated that under livabilities of 90G and 99.9G respectively, connecting rod fatigue limits are 33 kN and 29.7 kN, and tension and compression safety coefficients 1. 65 and 1. 35, while confidence degree of 9oX

关 键 词：内燃机 疲劳寿命 存活率 S—N曲线 

分 类 号：TK413[动力工程及工程热物理—动力机械及工程]