基于数字图像相关方法的核石墨力学参数测量

Parameters Measurement of Nuclear Graphite Based on Digital Image Correlation

开发了基于数字图像相关(DIC)方法的核石墨力学参数测量方法,给出了具体的数据处理方法和测量流程,并用IG-11型核石墨对该方法进行了验证试验,结果表明,DIC方法测得的杨氏模量和泊松比与电阻应变片法的测量结果具有很好的一致性,验证了DIC方法的可行性和准确性;通过DIC方法获取了完整的应力-应变曲线,证明了DIC方法在测量具有大变形特性的材料力学参数方面的优越性;此外,用DIC方法测量核石墨力学参数的试验具有操作简便且易于发现加载偏心等特点,为脆性材料的大样本试验及保证测试数据可靠性等方面提供了方便和保障。

This paper develops a method for measuring the mechanical parameters of nuclear graphite based on digital image correlation(DIC)method,and gives detailed data processing method and measurement procedure.The experimental results show that the Young’s modulus and Poisson’s ratio extracted from DIC data are in good agreement with those from the strain-gauge-based method,which verifies the feasibility and accuracy of the DIC method.In addition,the complete stress-strain relationship was obtained from DIC method,confirming the superiority of DIC method in measuring the mechanical parameters of materials with large deformation.Furthermore,the DIC method is easy to operate and efficient in identify the loading misalignment,making it convenient in large number of tests and reliable for the data acquisition for brittle materials testing.