中文摘要：

提出了用“残余应变不平衡法”来检测SiCf／Ti基复合材料的残余热应力。即在复合材料中单边多加入基体合金而形成层状材料，冷却中因残余热应变不平衡而产生弯曲，测量弯曲变形量，计算复合层间的热应力和应变，得出产生残余热应力的起始温度为704℃。采用Schapery模型计算不同温度下SiCf体积分数为35％的SiCf／Ti6A14V复合材料热膨胀系数，获得了SiCf／Ti6A14V复合材料中Ti6A14V基体和SiC纤维中的平均残余热应力分别为349 MPa和648 MPa。

英文摘要：

A method of imbalanced residual strain was supposed in order to measue the thermal residual stresses in SiCf/Ti-matrix composites. In the method, a laminated material composed of SiCf/Ti6A14V composite and matrix titanium at one side of the composite was fabricated and the laminated sample is bent at room temperature due to the imbalance of the thermal residual strain. The magnitude of the bending deformation was measured and the thermal residual stresses were calculated. It is found that the starting temperature for producing the residual stresses is 704℃. The Schapery model was adopted to calculate the coefficients of thermal expansion （CTE） of the SiCf/Ti6A14V composites with volume fraction of 35%. The average thermal residual stress in Ti6A14V matrix and in SiC fiber was determined to be 349 MPa and 648 MPa, respectively, in the SiCf/Ti6A14V composite.