5A03铝合金管轴向压缩失稳形式及影响因素分析  

Analysis on Instability Forms of 5A03 Aluminum Alloy Tube under Axial Compression and Its Influencing Factors

作　　者：李翀[1] 鄂大辛[1] 佘彩凤[1] 

机构地区：[1]北京理工大学材料学院,北京100081

出　　处：《精密成形工程》2014年第2期36-40,50,共6页Journal of Netshape Forming Engineering

基　　金：国家自然科学基金(51175044)

摘　　要：目的研究管材在承受轴向压缩时的力学行为、失稳形式及其影响因素。方法在航空航天用5A03铝合金管准静态轴向拉伸和压缩实验的基础上,进行了管压缩过程的有限元分析。结果5A03圆管拉伸与压缩力学性能有较大差异,具有拉、压双模量倾向,拉伸屈服强度略低于压缩屈服强度,抗拉强度略低于抗压强度,且拉伸与压缩均呈现锯齿波屈服特性;高径比影响管压缩失稳形式,小于1时管试样形成单鼓,大于1时将出现双鼓,且鼓凸在管材端面摩擦较大一端优先出现。结论管材失稳鼓凸后表现为一种具有一定规律性的非轴对称屈曲压溃。Objective To investigate the mechanical behavior, the buckling form and influencing factors of the pipes under axially compressive load. Methods Based on a series of experiments on quasi-static tensile and compression test of 5A03 aluminum alloy tube, finite element analysis of axial compression for this tube was carried out. Results The results showed that there were differences between tensile and compressive mechanical properties of 5A03 tube, such as tendency of tensile-compressive bi-modulous, the tensile yield strength was slightly higher than the compressive yield strength, the tensile strength was slightly lower than the compressive strength, and both the tensile and compression tests exhibited cer- tain yield characteristics of saw tooth wave. Height-diameter ratio affected the form of compression instability： when the ra- tio was lower than one, the test specimen developed into a figure of single bulge, while it turned into a figure of double bulge as the ratio became larger than one. The bulge preferred to occur at the end where the friction was larger. Conclusion The tube exhibited a certain regular non-axisymmetric buckling crushing after compression instability.

关 键 词：5A03管 轴向压缩 失稳 准静态实验 

分 类 号：TG115.53[金属学及工艺—物理冶金]