疲劳裂纹扩展门槛值测试技术  

Measuring and testing techniques of fatigue crack growth threshold

作　　者：刘青峰[1] 张治国[2] 邹骅[3] 李晓阳[4] 

机构地区：[1]92117部队 [2]中国铁道科学研究院标准计量研究所 [3]北京交通大学机械与电子控制工程学院 [4]北京工业大学机械工程与应用电子技术学院

出　　处：《北京交通大学学报》2017年第3期109-113,119,共6页JOURNAL OF BEIJING JIAOTONG UNIVERSITY

摘　　要：针对裂纹扩展门槛值测量技术中存在的不足,应用数字化测量技术采集试样测点位移与试验载荷,采用柔度法计算裂纹长度,由测点位移波形的峰值记录循环次数,多线程软件设计实现试验控制和数据采集、监视与处理一体化,从而保证测试结果的准确性.根据不同载荷比下40CrNiMo钢疲劳裂纹扩展门槛值成组试验的结果,验证了上述测试技术的可靠性与可行性.In view of insufficiency in crack growth threshold measurement technology, the survey- point displacement of specimen and test-load are collected through digital measurement technolo- gy, and the crack size is calculated through the compliance method, the cycle index is recorded according to the wave crest of survey-point displacement. Besides, the integrated objective Of test control, data collection, monitoring and processing are implemented by the multi-thread software. The results of the fatigue crack growth thresholds of steel 40CrNiMo, which are obtained from group test method under different load-ratio, prove the reliability and feasibility of measuring and testing techniques.

关 键 词：裂纹测试技术 柔度法 应力强度因子 疲劳裂纹扩展门槛值 

分 类 号：U270.12[机械工程—车辆工程]