EVALUATION OF RESIDUAL STRESS IN A THICK-WALLED TUBE FOR FUNCTIONALLY GRADIENT MATERIAL

功能梯度材料厚壁管残余应力的评估

• 批准号: 04650091
• 负责人: TOYA Masayuki
• 金额: $ 1.34万
• 依托单位: KAGOSHIMA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04650091/
• 关键词: Functionally Gradient Material; Residual Stress; Thermal Stress; Numerical Analysis; Bending; Inverse Problem

A study has been done for examining the residual stress in a thick-walled tube of a functionally gradient material manufactured by a centrifugal method. Duralcan F3D.20S composites that were AL/20vol%SiC were adopted as a master composites. The effectiveness of the curved beam theory considering the gradation of properties was first to eamine by a ring compression test. The circumferential strain generated by residual stress were measured based on the cutting test and the observed strain were in the range of - 750mu strain to 500mu strain. Based on this results, the distribution of residual stress were analyzed as an inverse problem and a numerical analysis was also adopted to solve the thermal deformation of axial symmetry. When the test pieces were cooled uniformly, the yielded stress and strain were changed from compression to tension toward the outside of the tube accompanied with a decrease in a coefficient of thermal expansion., It was concluded that the residual stress were generated by a cooling from a reference temperature of half the melting point to ambient temperature that was about 140K.The residual stress were found to enlarged corresponding to the increase of thermal epansion mismatch and radial thickness.

已经进行了一项研究，以检查通过离心方法生产的功能梯度材料的厚壁管中的残留应力。 Duralcan F3D.20S的复合材料Al/20vol％SIC被用作主复合材料。考虑性质级别的弯曲梁理论的有效性首先是通过环压缩测试到Eamine的。根据切割试验测量了由残留应力产生的圆周应变，观察到的应变在-750mU应变范围内，至500mU菌株。基于此结果，将残余应力的分布分析为一个反问题，还采用了数值分析来求解轴向对称性的热变形。当测试片均匀冷却时，屈服的应力和应变从压缩变为张力向管外部的张力变化，伴随着热膨胀系数的降低。 厚度。