作者：薛河, 王双, 赵有俊, 苟思育, 倪陈强

作者单位：西安科技大学机械工程学院，陕西 西安 710054

关键词：直流电位降法;有限元法;主电位接线点;几何尺寸;标定曲线

摘要：

为保证核电结构裂纹扩展监测结果的准确性，建立有效的标定方法至关重要。该文根据直流电位降(DCPD)法的原理和有限元分析软件建立电位场模型，直观、定量地获得电位场变化数据，分析紧凑拉伸(CT)试样在不同裂纹长度下的电位降，并从监测环节考虑多种因素对标定曲线的影响，最后结合裂纹监测平台进行实验验证。结果表明，裂纹主电位接线点的位置、不同材料和几何尺寸对标定曲线产生微伏级的影响，仿真与实验数据分析结果的最大误差为4.9%。该标定曲线具有一定的可行性，可为后续动态裂纹扩展监测实验及验证工作提供参考。

Calibration method for numerical simulation of crack growth of CT specimens based on DCPD
XUE He, WANG Shuang, ZHAO Youjun, GOU Siyu, NI Chenqiang
School of Mechanical Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
Abstract: To ensure the accuracy of crack extension monitoring results in nuclear power structures, it is crucial to establish an effective calibration method. This paper establishes an electric potential field model based on the principle of the direct current potential drop (DCPD) method and finite element analysis software to obtain the electric potential field variation data intuitively and quantitatively, analyzes the potential drop of compact tensile (CT) specimens at different crack lengths, and considers the influence of various factors on the calibration curve from the monitoring link, and finally combines the crack monitoring platform for experimental verification. The results show that the location of the crack’s main potential connection point, different materials, and geometric dimensions have microvolt-level effects on the calibration curve, and the maximum error between the simulation and experimental data analysis results is 4.9%. Therefore, the calibration curve has certain feasibility, which provides support for the subsequent dynamic crack extension monitoring experiments and validation work.
Keywords: direct current potential drop method;finite element method;main potential connection point;geometric dimensions;calibration curve
2023, 49(1):36-42  收稿日期: 2021-05-08;收到修改稿日期: 2021-08-21
基金项目: 国家自然科学基金资助项目(52075434)；陕西省国际科技合作计划项目(2021KW-36)；陕西省自然科学基础研究计划项目(2021JM-389)
作者简介: 薛河(1961-),男,江苏扬州市人,教授,博士生导师,主要从事重要机械结构完整性评价方面的工作
参考文献
[1] GIUSEPPE S, PETER C, PETER B N. An approximate model for three-dimensional alternating current potential drop analyses using a commercial finite element code[J]. NDT and E International, 2010, 43(2): 134-140
[2] 王勇勇, 孙全德, 王恪典, 等. 角焊缝表面裂纹的涡流热成像检测研究[J]. 中国测试, 2021, 47(5): 11-15
[3] 康达, 孔庆茹, 马啸啸, 等. 超声全聚焦成像的裂纹类缺陷定量误差分析[J/OL]. 中国测试:1-11[2021-08-15]. http://kns.cnki.net/kcms/detail/51.1714.TB.20210712.1601.008.html.
[4] CAMPAGNOLO A, BAR J, MENEGHETTI G. Analysis of crack geometry and location in notched bars by means of a three-probe potential drop technique[J]. International Journal of Fatigue, 2019, 124: 167-187
[5] LAMBOURG A, HENAFF G, NADOT Y, et al. Optimization of the DCPD technique for monitoring the crack propagation from notch root in localized plasticity[J]. International Journal of Fatigue, 2020: 130
[6] SI Y, ROUSE J P, HYDE C J. Potential difference methods for measuring crack growth: A review[J]. International Journal of Fatigue, 2020: 136
[7] CHEN D, GILBERT C J, RITCHIE R O. In situ measurement of fatigue crack growth rates in a silicon carbide ceramic at elevated temperatures using a DC potential system[J]. Journal of testing and evaluation, 2000, 28(4): 236-241
[8] TARNOWSKI K M, DEAN D W, NIKBIN K M, et al. Predicting the influence of strain on crack length measurements performed using the potential drop method[J]. Engineering Fracture Mechanics, 2017, 182: 635-657
[9] MENEGHETTI G, VECCHIATO L, CAMPAGNOLO A, et al. Numerical calibration of the direct current potential drop (DCPD) method in fracture mechanics fatigue tests[J]. Procedia Structural Integrity, 2020, 28: 1536-1550
[10] CHEPUTEH N, MANEERATANA K, KASITVITAMNUAY J. A finite volume simulation of electrical potential drop in 2D cracked plates[C]. International Conference on Science and Technology (TICST), IEEE, 2015: 20-26.
[11] 胡梦, 陈凯, 张乐福. 基于直流电压降法的三点弯曲试样疲劳裂纹扩展速率测量方法[J]. 上海交通大学学报, 2015, 49(12): 1778-1784
[12] CHOPRA O K, RAO A S. A review of irradiation effects on LWR core internal materials-IASCC susceptibility and crack growth rates of austenitic stainless steels[J]. Journal of Nuclear Materials, 2011, 409(3): 235-256