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Development of high precision measurement system of residual stress in engineering materials by time-of-flight neutron method

飞行时间中子法高精度工程材料残余应力测量系统研制

基本信息

批准号：
13555024
负责人：
AKINIWA Yoshiaki
金额：
$ 8.83万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13555024/
关键词：
Residual stress Neutron Phase stress Time-of-flight Angle dispersion method Diffraction elastic constant 残留応力

项目摘要

Tensile testing machine was installed at the Sirius in the High Energy Accelerator Research Organization (KEK). By using the tensile testing machine, in-situ strain measurement can be carried out during tensile loading. The methods of stress measurement for single crystals and multi-phase polycrystalline materials were proposed. The effect of porosity on the elastic constants was investigated by the proposed method. Evaluation method of elastic constant of single crystals on the basis of a number of diffraction constants measured with poly-crystals was proposed. Further more, a simplified method to predict the diffraction elastic constant for arbitrary diffraction plane by using the elastic constant of single crystals was proposed. For the engineering materials, residual stress and loading stress of quenched steels, metal matrix composites, ceramics matrix composites and shape memory alloys were measured. For the composites, the loading stress and the residual stress can be evaluated by the micro mechanics models by considering that the one of the constituent phase is inclusion. To determine the lattice strain with sufficient accuracy, the diffraction intensity must be larger than 300 counts. The lattice strain can be evaluated by a single peak analysis and the Rietveld analysis by using full diffraction patterns.

拉伸试验机安装在高能加速器研究组织（KEK）的Sirius。通过使用拉伸试验机，可以在拉伸加载期间进行原位应变测量。提出了单晶和多相多晶材料应力测量的方法。用该方法研究了孔隙率对弹性常数的影响。提出了一种基于多晶衍射常数的单晶弹性常数估算方法。提出了一种利用单晶体弹性常数预测任意衍射面衍射弹性常数的简化方法。对于工程材料，测量了淬火钢、金属基复合材料、陶瓷基复合材料和形状记忆合金的残余应力和加载应力。对于复合材料，加载应力和残余应力可以通过细观力学模型来计算，考虑到组成相之一是夹杂物。为了以足够的精度确定晶格应变，衍射强度必须大于300计数。晶格应变可以通过使用全衍射图案的单峰分析和Rietveld分析来评估。