弹-塑性圆管受纯弯载荷作用的实验研究  

An Experimental Research on Elasto-Plastic Circular Pipe under Bending Loads

作　　者：薛嘉行[1] 姜开厚[2] 杨嘉陵[2] 苏先樾[1] 

机构地区：[1]北京大学,北京100871 [2]北京航空航天大学,北京100083

出　　处：《应用力学学报》2000年第4期50-57,共8页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金资助项目

摘　　要：报导了长圆管的四点弯曲实验，并对圆管在纯弯曲载荷作用下的弹塑性屈曲特性进行了分析。目的是了解在弯曲过程中出现的截面扁化和较薄壳体在其受压面沿长度方向出现的小波纹等不同的失稳现象，以及这些现象对圆管抗弯能力的影响。另外，探讨圆管直径与壁厚比D／t和壳体材料对圆管失稳模态，以及弯矩与曲率关系的影响。实验对象为四种不同径厚比D/t(20，25，34，42)，并且分属三种不同材料(LY11M，LY12M，LF2M)的铝制圆管。A quasi-static four-point bending test were carried out on circular aluminum pipes with 4 different diameter-to-thickness ratios ranging from 20 to 42, and with 3 different materials (LY11M, LY12M, LF2M). We obtained the relationship between bending moment and curvature in the purely bent pipes, and recorded the ovalizat ion of the shell cross-section caused by bending. For pipes whose diameter-to-thickness ratio is 42, short wavelength ripples developed on the compressed side of shell were observed and recorded. Also, the influences of diameter-to-thickness ratio and material on the mode of collapse and moment-curve relationship were discusses.

关 键 词：弹-塑性圆管 稳定性 扁化 小波纹 

分 类 号：TB12[理学—工程力学]