套孔工艺对深孔法测量残余应力精度的影响  

Influence of Trepanning Technology on the Accuracy of Residual Stress Measurement Using the Deep-hole Drilling Method

作　　者：赵美娟 陈静[1,3] 陈怀宁[1,3] ZHAO Meijuan;CHEN Jing;CHEN Huaining(Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016;School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016;Key Laboratory of Nuclear Materials and Safety Assessment,Chinese Academy of Sciences,Shenyang 110016)

机构地区：[1]中国科学院金属研究所,沈阳110016 [2]中国科学技术大学材料科学与工程学院,沈阳110016 [3]中国科学院核用材料与安全评价重点实验室,沈阳110016

出　　处：《机械工程学报》2020年第22期38-45,共8页Journal of Mechanical Engineering

摘　　要：深孔法是目前三维残余应力测量方法中精度较高、破坏性较小、易于操作的一种技术,相比于中子衍射法,测量成本相对较低,正受到越来越多的关注。针对轴向套孔工艺能准确测量应力范围有限的问题,为提高该方法在高应力与复杂应力场中的测量精度、优化测量工艺,提出环向套孔工艺。以Q345低合金钢为研究对象,采用有限元分析方法分别建立两种套孔工艺计算模型,对比分析两种套孔工艺在不同应力状态下模拟计算值与实际值的误差分布情况。结果表明,两种套孔工艺均适用于弹性应力场的精确测量,但在应力较大时(超过屈服强度50%),采用环向套孔工艺得到的应力计算结果精度更高、且深度方向应力分布的一致性更好。The deep-hole drilling method is a high accuracy,low destruction and easy operation technology in three-dimensional residual stress measurements.Compared with neutron diffraction method,the cost of measurement is lower,and it is attracting more and more attention.In order to improve the measurement accuracy of this method in high and complex stress field,and also optimize the measurement process,a circumferential hole-trepanning technology is investigated since the stress range can be accurately measured using the axial hole-trepanning technology is limited.Taking the low alloy steel Q345 as the research object,two different calculation models of hole-trepanning technologies are established using finite element method,and then the error distributions between simulated and actual values of two kinds of hole-trepanning technologies under different stress states are compared and analyzed.The investigated results show that both methods are suitable for the accurate measurement of elastic stress field,but when the stress is large(over 50%yield strength),the stress calculation result obtained by using the circumferential hole-trepanning technology is more accurate and the stress distribution in depth direction is better.

关 键 词：深孔法 残余应力 数值模拟 套孔工艺 测量精度 

分 类 号：TG404[金属学及工艺—焊接]