长纤维局部增强铝合金中的宏观残余应力  

Study on macroscopic residual stresses in long fibre reinforced aluminum alloy

作　　者：孙少纯[1] 张辉[1] 马德新[2] 赵玉涛[1] 陈刚[1] 

机构地区：[1]江苏大学材料科学与工程学院,江苏镇江212013 [2]德国亚琛工业大学铸造研究所,德国亚琛52072

出　　处：《江苏大学学报（自然科学版）》2011年第1期43-46,55,共5页Journal of Jiangsu University：Natural Science Edition

基　　金：江苏省高技术研究项目(BG2007030);江苏省高校自然科学重大基础研究项目(07KJA43008)

摘　　要：采用钻孔法测定了长纤维局部增强的铝合金试样中增强区与非增强区之间的宏观残余应力,利用有限元法对此进行了模拟计算.结果表明:增强区与非增强区之间存在着明显的宏观残余应力,但分布很不均匀.在增强区和非增强区大部分区域,残余应力并不大,而宏观边界附近的非增强区以及增强区的局部存在高残余拉应力微区.在50%纤维局部增强的试样中,这些微区残余拉应力可达120～140 MPa.通过数据比较,分析了增强区内增强纤维体积分数对宏观残余应力的影响,即随着纤维体积分数的增加,试样内宏观残余应力水平随之增大,且试样内最大残余拉应力的增加更加明显;当纤维体积分数大于65%时,试样内会出现大于200 MPa的高残余拉应力.The macroscopic residual stresses between reinforced and unreinforced zones in long fibre reinforced aluminum samples were measured with the borehole method and simulated with FEM.The results indicate that there exist obvious macroscopic residual stresses in the samples,which are distributed very unequal.It was found that the macroscopic residual stresses at most locations in both the reinforced and unreinforced zones were not harmfully high.However,there were some small region with large tensile residual stresses in the unreinforced zone very close to the boundary.These high tensile residual stresses could reach 120 ～140 MPa in the samples locally reinforced with 50% long fibre.The influence of fibre volumetric contents in the reinforced zone on the macroscopic residual stresses was analyzed with data comparisons.With increase of fibre volumetric contents the macroscopic residual stresses in the sample increase.The fibre volumetric contents have much greater effects on the maximal residual tensile stress in the sample.If the fibre volumetric contents exceed 65%,the maximal residual tensile stress appearing in the sample will reach more than 200 MPa.

关 键 词：铝合金 复合材料 长纤维 残余应力 数值模拟 

分 类 号：TB333[一般工业技术—材料科学与工程]