Extension of Applicable Range of Measuring Residual Stress by Ring-Core Method
摘 要
传统的采用环芯法测定残余应力公式中的应变释放系数公式是通过数值标定或试验标定得到的,而且现有标准中释放系数的确定只是针对特定泊松比的材料。为了拓展环芯法测定残余应力的适用范围,采用理论分析及有限元模拟的方法评估了不同材料的泊松比对释放系数的影响,建立了标定应变释放系数的有限元模型及其释放系数与泊松比、槽深的函数关系。结果表明:泊松比偏离0.3较大时,传统环芯残余应力测定方法会有明显的误差,而此误差本质上是系统误差;得到了考虑泊松比的残余应力修正公式,并用试验验证了该公式的正确性;修正公式不受泊松比的限制。
Abstract
The strain release coefficients in classical ring-core residual stress measurement formula were obtained by numerical calibration or experimental calibration, and these release coefficients in the existing standard were determined only at a specific Poisson′s ratio. To expand the applicable range of measuring residual stress by ring-core method, the effects of Poisson′s ratio of different materials on release coefficients were evaluated by theoretical analysis and finite element simulation. Finite element model was established to calibrate the strain release coefficients, and a functional relationship between the release coefficients and Poisson′s ratio and groove depth was established. It is found that Poisson′s ratio with a relatively big deviation from 0.3 could cause significant error in the measured residual stress, and the error was systematic in nature. A modified residual stress formula including Poisson′s ratio was obtained, and the formula was verified through an experiment. The modified formula was not limited by Poisson′s ratio.
中图分类号 O348 TB121 DOI 10.11973/jxgccl201512011
所属栏目 物理模拟与数值模拟
基金项目 西南交通大学牵引动力国家重点实验室开放课题基金资助项目(TPL1301);国家自然科学基金资助项目(51275338)
收稿日期 2014/8/31
修改稿日期 2015/6/21
网络出版日期
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备注陈忠安(1955-),男,江苏徐州人,教授,硕士。
引用该论文: CHEN Zhong-an,SUN Guo-chao,ZHAO Yu-jin,JIN Xue-song. Extension of Applicable Range of Measuring Residual Stress by Ring-Core Method[J]. Materials for mechancial engineering, 2015, 39(12): 47~50
陈忠安,孙国超,赵玉津,金学松. 环芯法测定残余应力适用范围的拓展[J]. 机械工程材料, 2015, 39(12): 47~50
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【2】刘金娜, 徐滨士, 王海斗,等. 材料残余应力测定方法的发展趋势[J]. 理化检验-物理分册,2013,49(10):677-682.
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【4】KEIL S. Experimental determination of residual stresses with the ring-core method and an on-line measuring system[J]. Experimental Techniques,1992,9/10:17-24.
【5】陈惠南.大型汽轮机、发电机转子残余应力测量新方法-环芯法及国外应用实例[J].大型铸锻件,1997(1):40-45.
【6】王桂芳, 陈惠南. 环芯法测量深度方向上的残余应力分布[J]. 机械强度,1997,19(1):22-26.
【7】王桂芳, 陈惠南. 环芯法A、B释放系数的有限元计算[J]. 机械强度,1992,14(4):24-28.
【8】张景忠, 商成海, 于克江,等. 用环芯法测定残余应力的基本原理和潜在的应用范围[J].一重技术,2001(2):135-138.
【9】张景忠, 吕洪岱, 郁红,等. 环芯法测定残余应力的基本原理及其应用[J].一重技术,1997(3):56-59.
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【11】CIVN A, VLK M. Ring-core residual stress measurement: analysis of calibration coefficients for incremental strain method[J].Bulletin of Applied Mechanics,2010,6(24):77-83.
【12】CIVN A, VLK M. Determination of principal residual stresses′ directions by incremental strain method[J]. Applied and Computational Mechanics, 2011,5:5-14.
【13】陈惠南. 环芯法检测汽轮机、发电机转子锻件残余应力误差分析[J].大型铸锻件,1997(2):15-18.
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