用于核级石墨断裂分析的相位测量技术研究  

Research of Phase Measurement Techniques for Fracture Analysis of Nuclear Graphite

作　　者：王琳霖 曹国强 王亚杰 李正强 王路平 吴燕燕 Wang Linlin, Cao Guoqiang, Wang Yajie, Li Zhengqiang, Wang Luping, Wu Yanyan(Engineering Training Center, Shenyang Aerospace University, Shenyang , Liaoning 110136, Chin)

机构地区：[1]沈阳航空航天大学工程训练中心,辽宁沈阳110136

出　　处：《激光与光电子学进展》2018年第3期315-321,共7页Laser & Optoelectronics Progress

基　　金：辽宁省自然科学基金(20170540701);辽宁省教育厅项目(L2015411)

摘　　要：核级石墨是高温气冷反应堆堆芯的主要构件材料,石墨材料的断裂性能研究和裂纹扩展过程分析对石墨构件的结构完整性分析具有重要意义。基于径向基函数(RBF)的滤波方法适合于低密度电子散斑干涉(ESPI)图的滤波,提出基于径向基函数滤波与质量图引导的解包裹算法结合的相位测量方法,通过模拟相位图对该方法进行验证,同时将其与传统的均值滤波方法进行定量比较。采用ESPI技术和三点弯曲方法对核级石墨试件的断裂行为进行测量,实验样本带有预制裂纹,记录裂纹演化过程中不同载荷下的ESPI包裹相位图,利用基于径向基函数滤波与质量图引导的解包裹算法获得各个时刻的相位等值线,给出了试件裂纹演化过程曲线图。结果表明,该方法可对核级石墨的裂纹演化进行有效的测量。Nuclear graphite is the primary structural material of reactor core in the high temperature gas-cooled reactor. It is of great significance for the research of the graphite＇s fracture property and the analysis of the crack propagation process to analyze the structural integrity of graphite component. The filtering method based on radial basis function （RBF） is suitable for electronic speckle pattern interferometry （ESPI） speckle patterns with low density. A kind of phase measuring method base on RBF filtering and quality-guided phase-unwrapping algorithm is proposed, then this method is tested via application to computer-simulated ESPI phase pattern and compared with the average filtering quantitatively. ESPI technique and three-point bending tests are employed to measure the fracture property of nuclear graphite specimen with pre-cracking. The ESPI wrapping phase patterns are recorded with different loads in the evolutionary process of crack, and the phase contours are extracted by the use of RBF filtering method and quality-guided phase-unwrapping algorithm, then the evolutionary process sketch map of the specimen is given. The experimental results demonstrate that this method is effective to measure the crack evolutionary process of nuclear graphite.

关 键 词：测量 散斑干涉 核级石墨 径向基函数滤波 相位解包裹 

分 类 号：TN247[电子电信—物理电子学]