摘要
基于弹塑性弯曲基本原理,以板材进入矫直机后经历的第2次弯曲为例,建立考虑包辛格效应影响程度(KBa)的辊式矫直复杂弯曲力学模型。采用该模型计算KBa对第2次弯曲时M-C关系和ξ-C关系及残余应力的影响,证明辊式矫直过程中经历多次弹塑性弯曲的截面反弯特性受材料包辛格效应的影响,而且随着材料强化系数的增大,截面弯曲特性所受影响越显著。最后计算相同矫直工况下,KBa不同的材料的残余曲率,得到材料KBa对于残余曲率的影响。研究结果表明:强化系数较大(η>0.01)的材料进行矫直仿真时应考虑包辛格效应,在实际生产中确定工艺参数时需要首先确定材料的KBa。
Based on the basic theory of elastic-plastic bending, a mechanical model of complicated bending process of the section under different degrees of Bauschinger effect （KBa） was built by taking the second bend of the plate bears after bited into the leveler as an example. The effect of KBa on the M？C and ξ？C relation and residual stress distribution could be gotten through the model calculation, which could prove that the reverse bending behavior of the elastic-plastic bending section, after experiencing several times of deformation during roller leveling process, was affected by the Bauschinger effect of the material. And more pronounced was gotten with the increase of the strength coefficient of the material. Finally, the residual curvatures of materials with different KBa under the same process conditions were calculated and the effect of KBa on it were gotten. The results show that the Bauschinger effect should be considered when roller leveling with the coefficient of the material is big（η〉0.01） and KBa of the material needs to be firstly determined when process parameters in actual production are determined.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2018年第1期87-94,共8页
Journal of Central South University:Science and Technology
基金
国家"十二五"科技支撑计划项目(2015BAF30B01)~~
关键词
包辛格效应
辊式矫直
强化系数
弯矩-曲率
残余应力
Bauschinger effect
roller leveling
strength coefficient
moment-curvature
residual stress
