桥梁结构用钢16Mn棘轮效应的塑性流动特性分析  

Analysis of plastic flow characteristics based on bridge steel 16Mn ratcheting

作　　者：向阳开[1] 马艳兵[1] 郑怡 周志祥[1] 

机构地区：[1]重庆交通大学土木建筑学院,重庆400074 [2]辽宁省建筑材料监督检验院,辽宁沈阳110032

出　　处：《重庆大学学报（自然科学版）》2010年第8期109-113,共5页Journal of Chongqing University

基　　金：教育部科学技术研究重点项目(地方02132)

摘　　要：结合桥梁结构中用钢16Mn钢在应力控制下的棘轮效应实验,针对塑性模量H、背应力率偏量与塑性流动方向之间夹角θ等开展了塑性流动特征分析,指出了单轴和多轴棘轮效应的不同影响机制,即单轴棘轮效应的产生和演化决定于相对平均应力对称的正、反向加载点处的塑性模量的变化,塑性模量在正向加载和反向加载时分别遵循着不同演化规律;而多轴棘轮效应的产生和演化是H和θ共同作用的结果,棘轮效应的先前较大加载历史效应是先前较大加载历史对背应力率偏量与塑性流动方向之间夹角θ的影响结果。The analysis of the plastic flow characteristics on the basis of the ratcheting experimental results for the bridge steel 16Mn are carried out by calculatig the plastic modulus H and the angle θ between the backstress rate deviator and the plastic flow direction. The different mechanisms causing uniaxial and multiaxial non-proportional ratchetting are illustrated, that is, the starting and evolution of uniaxial ratchetting is due to the different values of the plastic modulus H at the symmetric loading points with respect to the mean stress. On the other hand, the staring and evolution of multiaxial non-proportional ratcheting is driven by H and θ variations. The influence of loading history on ratchetting is the result of the influence of loading history on the angle θ.

关 键 词：循环加载 棘轮效应 塑性流动特性 

分 类 号：O341[理学—固体力学]