Al-SiC傾斜機能材料厚肉リングにおける残留応力解析

概要

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A study has been conducted on the residual stress distribution in a thick-walled tube for an Al-SiC functionally gradient material manufactured by the centrifugal method. An ingot of Duralcan F 3 D. 20S of Al-20vol%SiC composite was adopted as a master composite. The applicability of a curved beam theory with a consideration of a gradation of elastic properties was first examined by a ring compression test. The circumferential strains generated by the residual stress were measured based on a cutting test and were in a range from-750 to 500μ strain. The distribution of the residual stress was analyzed as an inverse problem and a numerical analysis was also adopted to solve the thermal deformation of an axial symmetry. When the specimens were cooled uniformly, the yileded stress and strain were changed from compression to tension toward the outside of the ring accompanied by a decrease in the coefficient of thermal expansion. It was concluded that the residual stresses were generated by a cooling of 140 K which was from half the melting point to an ambient temperature. The residual stresses were found to increase with the increase of thermal expansion mismatch and radial thickness of the ring.
一般社団法人日本機械学会の論文
1994-06-25