Development of nondestructive evaluation system of fatigue damage by neutron diffraction

中子衍射疲劳损伤无损评价系统的研制

• 批准号: 09555029
• 负责人: TANAKA Keisuke
• 金额: $ 7.94万
• 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: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09555029/
• 关键词: Neutron stress measurement; Residual stress; Fatigue damage; X-ray stress measurement; Elastic constant; Composite; Welding; Plastic deformation; 疲労

1. A method to estimate the diffraction elastic constants of engineering materials was proposed on the basis of Eshelby's inclusion mechanics combined with the self-consistent model.2. The residual stress analyzer (RESA) was developed at the guide tube of T2-1 of the reactor, JRR-3M, at Japan Atomic Energy Research Institute (JAERI). To determine the distribution of the residual stress, an automatic devise for positioning and a bent crystal system for focusing were newly developed.3. The stress partioning of aluminum reinforced by SiC particles agrees very well with the prediction by micromechanics. The measured values of thermal residual stresses in alumina mixed with zirconia or with silicon carbide agreed with the prediction from the mismatch of the thermal expansion coefficient by micromechanics.4. The developed system for neutron stress measurements was successfully applied to measure the residual stress distribution in aluminum shrink fit, jacket material for ITER superconducting coil, and welded pipes.5. The change of the residual stress was detected by neutron diffraction at the time of crack initiation in fatigue of notched carbon steel bars. The redistribution of the residual stress due to crack propagation was detected by neutron diffraction near the weld joint of stainless pipes.6. A method was proposed toward standardization of neutron stress measurements.

1.基于Eshelby夹杂力学和自洽模型，提出了一种估算工程材料衍射弹性常数的方法.日本原子能研究所（JAERI）在反应堆JRR-3 M的T2-1导向管处开发了残余应力分析仪（RESA）。为确定残余应力的分布，研制了自动定位装置和弯晶聚焦系统. SiC颗粒增强铝合金的应力分布与细观力学的预测结果吻合得很好。实验测得的氧化铝与氧化锆或碳化硅混合材料的热残余应力值与微观力学根据材料热膨胀系数失配的预测值相吻合.所开发的中子应力测量系统成功地应用于铝热套、ITER超导线圈护套材料和焊接管道的残余应力分布测量.用中子衍射法测定了缺口碳钢棒疲劳裂纹萌生时残余应力的变化。用中子衍射法检测了不锈钢管道焊接接头附近裂纹扩展引起的残余应力重分布.提出了一种中子应力测量标准化的方法。

项目成果

K. Tanaka: "Effect of Secondary Phase on Elastic onstants for Stress Measurement of Multi-Phase Materials by X-Ray and Neutron Diffraction Methods"JSME International Journal, Series A. 41・2. 280-286 (1998)

K. Tanaka：“二次相对弹性蚂蚁的影响，用于通过 X 射线和中子衍射方法测量多相材料的应力”JSME 国际期刊，系列 A. 41・2 (1998)。

Makoto Hayashi: "Residual Stress Distribution Measurement in Plastically Bent Carbon Steel by Neutron Diffraction" The 5th inter. Conf. Residual Stresses. C-Po24 (1997)

Makoto Hayashi：“通过中子衍射测量塑性弯曲碳钢的残余应力分布”第五期中间。

林眞琴: "ステンレス鋼配管溶接部近傍のき裂進展に伴う残留応力の再分布測定"日本材料学会,第35回材料強度に関するシンポジウム講演論文集,. 14-17 (1999)

Makoto Hayashi：“不锈钢管道焊缝附近裂纹扩展引起的残余应力再分布的测量”，日本材料学会，第 35 届材料强度研讨会论文集，14-17 (1999)

秋庭 義明: "中性子およびX線法によるSiC粒子強化アルミニウム合金の相応力測定" 材料. 47・7. 755-761 (1998)

秋叶义明：“用中子和 X 射线方法测量 SiC 颗粒强化铝合金中的相应力”材料 47・7（1998）。

皆川宣明: "中性子イメージングプレートを用いた炭素鋼内部残留応力測定の試み" 第33回X線材料強度に関するシンポジウム講演論文集. 179-182 (1997)

Noriaki Minakawa：“尝试使用中子成像板测量碳钢中的内部残余应力”第 33 届 X 射线材料强度研讨会论文集 179-182 (1997)。