增材制造高强铝合金表面形貌重构及其屈服强度影响规律探究  

Investigation on the Influence of Surface Topography Reconstruction and Yield Strength of High-strength Aluminum Alloys in Additive Manufacturing

作　　者：董子良 程正坤 张晓楠 文聘 Ziliang Dong;Zhengkun Cheng;Xiaonan Zhang;Pin Wen(Department of Engineering Structures and Mechanics,School of Science,Wuhan University of Technology,Wuhan,430070;School of Undergraduate Education,Shenzhen Polytechnic University,Shenzhen,518885)

机构地区：[1]武汉理工大学理学院工程结构与力学系,武汉430070 [2]深圳职业技术大学本科教育学院,深圳518885

出　　处：《固体力学学报》2024年第5期638-651,共14页Chinese Journal of Solid Mechanics

基　　金：国家自然科学基金项目(11902232);广东省基础与应用基础研究基金海上风电联合项目(2022A1515240057);深圳市科技计划项目(20231128093312001)资助。

摘　　要：为了研究表面形貌对增材制造材料力学性能的影响,本文通过选择性激光熔化方法制备了高强度铝合金试样,研究了扫描速度、热处理、沉积方向、表面粗糙度等对拉伸力学性能的影响,并基于傅里叶级数和MATLABA软件对光学显微镜测量的表面形貌进行了重构,使用Airy应力函数推导获得了表面形貌应力集中系数的解析解.采用ABAQUS软件进行了有限元分析,对解析结果进行了验证.通过正态拟合得到应力集中系数的概率密度函数,提出了一种基于屈服强度评估材料可靠性的方法.本文所提出方法流程为增材制造其他材料及试样表面粗糙度定量化及其对屈服强度影响具有参考意义.To investigate the impact of surface topography on the mechanical properties of additive manufacturing materials,in this paper,high-strength aluminum alloy specimens were fabricated by the selective laser melting method.The influences of scanning speed,heat treatment,deposition direction,and surface roughness on tensile mechanical properties were examined.The surface topography measured by an optical microscope was reconstructed based on the Fourier series and MATLAB software,and the analytical solution of the stress concentration coefficient of the surface topography was derived using the Airy stress function.Finite element analysis was conducted using ABAQUS software to validate the analytical results.The probability density function of the stress concentration coefficient was obtained through normal fitting,and a method for evaluating the reliability of the material based on yield strength was proposed.The proposed methodology in this paper is of reference significance for the quantification of surface roughness and its effect on yield strength of other additive manufacturing materials and specimens.

关 键 词：增材制造 应力集中系数 可靠性分析 表面形貌 仿真模拟 

分 类 号：TG146.21[一般工业技术—材料科学与工程]