纳米压痕和反演分析法确定Al_(18)B_(4)O_(33)w/2024Al复合材料基体力学性能  

Determination of mechanical properties of matrix in Al_(18)B_(4)O_(33)w/2024Al composites by nanoindentation and reverse analysis method

作　　者：石文超 汪吉赛 曹洪 许锋 张辉 王成国[4] SHI Wen-chao;WANG Ji-sai;CAO Hong;XU Feng;ZHANG Hui;WANG Cheng-guo(Institute of Industry and Equipment Technology,Hefei University of Technology,Hefei 230009,China;Anhui Province Key Lab of Aerospace Structural Parts Forming Technology and Equipment,Hefei 230009,China;School of Mechanical and Vehicle Engineering,West Anhui University,Lu^n 237012,China;The 38,h Research Institute of China Electronics Technology Group Corporation,Hefei 230009,China)

机构地区：[1]合肥工业大学工业与装备技术研究院,安徽合肥230009 [2]航空结构件成形制造与装备安徽省重点实验室,安徽合肥230009 [3]皖西学院机械与车辆工程学院,安徽六安237012 [4]中国电子科技集团公司第三十八研究所,安徽合肥230088

出　　处：《塑性工程学报》2021年第7期169-174,共6页Journal of Plasticity Engineering

基　　金：国家自然科学基金资助项目(51805134);中央高校基本科研业务费专项资金资助项目(JZ2020HGTB0039);安徽省重点研究与开发计划项目(1804b06020369)。

摘　　要：为探明铝基体强化对铝基复合材料强度的贡献值并确定铝基体力学性能参数,实现性能导向的铝基复合材料可控设计,针对Al_(18)B_(4)O_(33)w/2024Al复合材料铝基体开展纳米压痕试验,获取铝基体载荷-位移曲线,利用量纲法确定铝基体应变强化指数和初始特征应力,利用有限元迭代的反演分析法确定铝基体特征应力和特征应变。基于幂强化模型,确定铝基体屈服强度和幂函数型弹塑性应力-应变关系。基于获得的基体力学性能参数开展有限元模拟。结果表明:Al_(18)B_(4)O_(33)w/2024Al复合材料中铝基体弹性模量和纳米硬度分别为84.09和0.927 GPa。量纲法确定铝基体应变强化指数为0.224。反演分析法确定铝基体特征应力为396.51 MPa、特征应变为0.0301、名义屈服强度为226.47 MPa。有限元模拟获得的载荷-位移曲线与纳米压痕试验获得的载荷-位移曲线相关系数R2为0.9972,验证了量纲法及反演分析法确定Al_(18)B_(4)O_(33)w/2024Al复合材料基体力学性能参数具有高可靠性。To ascertain the strength contribution of aluminum matrix strengthening to aluminum matrix composites,and determine the mechanical properties parameters of aluminum matrix and realize the controllable design of performance-oriented aluminum matrix composites,nanoindentation tests of aluminum matrix in Al_(18)B_(4)O_(33)w/2024Al composites were carried out.The load-displacement curves of aluminum matrix were obtained.The strain strengthening index and initial representative stress of aluminum matrix were determined by dimension method.The representative stress and strain of aluminum matrix were determined by finite element iterative reverse analysis method.Based on the power strengthening model,the yield strength of aluminum matrix and the power function elastic-plastic stress-strain relationship were determined.The finite element simulation was carried out based on the obtained mechanical properties parameters of the matrix.The results show that elastic modulus and nano-hardness of aluminum matrix in Al_(18)B_(4)O_(33)w/2024Al composites are 84.09 and 0.927GPa,respectively.The strain strengthening index of aluminum matrix obtained by dimension method is 0.224.The representative stress of396.51 MPa,the representative stress of 0.0301 and the yield strength of 226.47 MPa were obtained by reverse analysis method.The correlation coefficient R2of load-displacement curves obtained by finite element simulation and nanoindentation test is 0.9972,which verifies the high reliability of mechanical properties parameters of matrix in Al_(18)B_(4)O_(33)w/2024Al composites obtained by dimension method and reverse analysis.

关 键 词：纳米压痕 基体强化 金属基复合材料 力学性能 反演分析法 

分 类 号：TG301[金属学及工艺—金属压力加工]