Development of High Precision System of Neutron Residual Stress Measurement

1.研制了一套用中子衍射法测量残余应力三维分布的新系统。2.通过测量结构钢在外加应力作用下的应变来确定结构钢的衍射弹性常数。实验结果与Kroner模型的预测结果吻合较好。3.利用该系统成功地测量了氮化硅中弯曲应力的分布。4.碳化硅颗粒增强铝合金各相中由于外加应力引起的相应力随着外加应力的增加而线性增加。用中子法测量了塑性弯曲试件的残余应力分布。6.用中子法测量了承插焊接头和对接焊接头附近的残余应力分布。这些结果为分析残余应力的形成机制提供了有用的信息。

1.A new system for the measurement of the three-dimensional distribution of residual stresses by neutron diffraction was developed in JAERI.2.The diffraction elastic constants of structural steels were determined by measuring the strain due to the applied stress. The experimental results agreed well with the prediction by Kroner model.3.The distribution of the bending stress in Silicon nitride was successfully measured by the system.4.The phase stress in each phase of SiC particulate reinforced aluminum alloy due to the applied stress increased linearly with the applied stress. The measured stresses agree with the prediction based on self consistent model.5.The residual stress distribution in plastically bent specimen was measured by the neutron method.6.The neutron method was applied to measure the residual stress distribution near the socket welded joints and butt welded joints. The results give useful information for analyzing the built-up mechanisms of residual stresses.