Analysis of the neutral layer offset of bimetal composite plate in the straightening process using boundary element subfield method
Analysis of the neutral layer offset of bimetal composite plate in the straightening process using boundary element subfield method
复制标题
边界元子场法分析双金属复合板矫直过程中性层偏移
DOI：
10.1016/j.apm.2017.04.038
复制
发表时间：
2017-10-01
影响因子：
5
通讯作者：
Li, Q.
中科院分区：
文献类型：
--
作者：
Gui, H. L.;Ma, L. F.;Li, Q.
在经典矫直理论中，假定几何中心层与应力中性层是重合的。然而，实际上有一些抵消。这是矫直过程中矫直力不准确的原因之一。本文采用边界元子场法分析了双金属复合材料板在矫直过程中的三维弹塑性变形。首先采用边界元子场法建立了双金属复合板的边界积分方程。然后，通过分析轧件矫直过程中的变形，得出几何中心层与中性层不重合的结论。建立了中性层偏移量的计算公式，并讨论了其变化规律。同时，研究了中性层偏移量对矫直力精度的影响。数值分析表明，在不考虑中性层偏移的情况下，矫直力的误差可达5%。这表明中性层偏移量是造成矫直力不准确的重要因素之一。在建立矫直力模型时，应考虑中性层偏移量。(C) 2017爱思唯尔公司版权所有。
In the classical straightening theory, it supposes that the geometric central layer and stress neutral layer are a coincidence. However, there is some offset in fact. This is one of the reasons why straightening force is inaccurate in the straightening process. In this paper, the boundary element subfield method is used to analyze the three-dimension elastic plastic deformation of a bimetal composite plate in the straightening process. At first, the boundary integral equation of a bimetal composite plate is established by the boundary element subfield method. Then, through analyzing the deformation in the rolled piece straightening, it shows that the geometric central layer does not coincide with the neutral layer. The formula of the neutral layer offset is established and the change law is discussed. At the same time, the influence of the neutral layer offset on the precision of straightening force is researched. From the numerical analysis, it shows that the error of the straightening force reaches to 5% whether considering the neutral layer offset. This demonstrates that the neutral layer offset is one of the important factors to give the straightening force inaccurately. It is ought to consider the neutral layer offset when the model of straightening force is established. (C) 2017 Elsevier Inc. All rights reserved.