泵体母材的疲劳裂纹扩展  

Fatigue crack propagation of pump body base material

作　　者：彭可 武小娟[1] 文明月 PENG Ke;WU Xiaojuan;WEN Mingyue(School of Materials Science and Engineering,Shenyang Ligong University,Shenyang 110159,China)

机构地区：[1]沈阳理工大学材料科学与工程学院,沈阳110159

出　　处：《沈阳师范大学学报(自然科学版)》2025年第1期18-23,共6页Journal of Shenyang Normal University:Natural Science Edition

基　　金：国家自然科学基金资助项目(52301098)。

摘　　要：研究CF8A钢疲劳性能及裂纹扩展规律,预防机械材料因应力集中导致的裂纹扩展与相关事故及经济损失。首先,采用试验与数值模拟结合的方法,通过声发射检测,判断壳体内部无超标缺陷,选取泵体母材CF8A钢进行疲劳裂纹扩展试验,获得其裂纹扩展规律,并基于Paris公式拟合疲劳裂纹扩展速率;其次采用有限元方法模拟裂纹扩展,结果显示裂纹尖端出现应力集中。对比裂纹扩展速率的试验与仿真结果,发现仿真值略小于试验值且误差较小,表明数值模拟可为评估材料寿命提供参考。In order to investigate the fatigue performance and crack propagation behavior of CF8A steel,and to prevent crack propagation and the associated accidents and economic losses caused by stress concentration in mechanical materials,a method combining experimental and numerical simulations was employed.Acoustic emission detection confirmed that there were no significant defects within the shell.A fatigue crack propagation test was conducted on the CF8A steel used in the pump body to determine its crack propagation characteristics,and the fatigue crack propagation rate was fitted using the Paris formula.Additionally,the finite element method was utilized to simulate crack propagation,revealing that stress concentration occurred at the crack tip.By comparing the experimental and simulation results of the crack propagation rate,it was observed that the simulation value was slightly lower than the experimental value,with a small margin of error.This indicates that numerical simulation can serve as a valuable reference for evaluating material lifespan.

关 键 词：CF8A钢 疲劳 裂纹扩展 有限元 

分 类 号：V231.95[航空宇航科学与技术—航空宇航推进理论与工程] O242.21[理学—计算数学]