A finite element framework for the evolution of bond strength in joining-by-forming processes
A finite element framework for the evolution of bond strength in joining-by-forming processes
复制标题
成型连接过程中粘合强度演变的有限元框架
DOI：
10.1016/j.jmatprotec.2014.03.015
复制
发表时间：
2014
影响因子：
6.3
通讯作者：
Mikloweit
中科院分区：
文献类型：
--
作者：
Bambach;Pietryga;Mikloweit
成形连接工艺广泛用于通过塑性变形永久连接两种或多种金属。在使用有限元方法或基于基本理论的模型对成形连接过程进行数值模拟时，通常的做法是不对键合的产生进行建模。或者，待接合的工件被牢固地绑在一起，如在辊压接合过程的模拟中所做的那样，或者工件在整个模拟中被视为单独的主体，如在摩擦焊接模拟中经常做的那样。这两种方法都是有问题的，当剪切应力发生在界面。剪切最初可能有助于增加粘结强度，但一旦产生，它也可能导致粘结失效。因此，为了实现具有界面剪切的成形接合过程的真实模拟，需要一种模型，该模型允许模拟两个初始分离的可变形体之间的结合的产生，以及当发生有害的加载条件时结合的释放。在本文中，提出了一个有限元框架，其中的发展，粘接模拟使用适应接触配方，它允许计算的粘结强度作为当地影响因素的函数。为了描述粘结强度的演变，张和湾提出的模型已被扩展的切线粘结强度，并实施到框架。使用简单的数值试验验证模型的实现。此外，还分析了屈服强度相差较大的两种铝合金在滚轧复合中结合强度的产生。研究表明，由于屈服应力差异较大，辊缝中产生的剪应力可能超过切向结合强度，因此在辊缝入口处产生的结合在辊缝出口附近断裂。
Joining-by-forming processes are widely used to permanently join two or more metals through plastic deformation. In the numerical simulation of joining-by-forming processes using finite element methods or models based on the elementary theory, it is common practice not to model the generation of the bond. Either, the workpieces to be joined are tied firmly together, as it is done in simulations of roll bonding processes, or the workpieces are treated as separate bodies throughout the simulation, as it is often done in friction welding simulations. Both approaches are problematic when shear stresses occur in the interface. Shear may initially help increase the bond strength, but it may also cause failure of the bond once it is created. Hence, to arrive at a realistic simulation of joining-by-forming processes with interface shear, a model is needed which allows for the simulation of the generation of a bond between two initially separate deformable bodies, and for the release of the bond when detrimental loading conditions occur. In this paper, a finite element framework is presented, in which the development of bonding is simulated using an adapted contact formulation, which allows for the calculation of bond strength as a function of local influence factors. To describe the evolution of bond strength, a model proposed by Zhang and Bay has been extended by a tangential bond strength and implemented into the framework. The model implementation is validated using simple numerical tests. In addition, the generation of bond strength in roll bonding of two aluminum alloys with a large difference in yield strength is analyzed. It is shown that due to the large yield stress difference, shear stresses that are generated in the roll gap can exceed the tangential bond strength, so that the bond that is created at the roll gap entry breaks near the roll gap exit.
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影响因子：
6.3
作者：
N. Bay;H. Bjerregaard;S. Petersen;C. D. Santos
通讯作者：
N. Bay;H. Bjerregaard;S. Petersen;C. D. Santos
使用线性和旋转速度场解决平面应变问题的上限方法 - 第一部分：基本概念
DOI：
10.1115/1.3187080
发表时间：
1986
期刊：
Journal of Engineering for Industry
影响因子：
--
作者：
B. Avitzur;W. Pachla
通讯作者：
W. Pachla
DOI：
--
发表时间：
1991
期刊：
影响因子：
--
作者：
Se;Dong Nyung Lee
通讯作者：
Dong Nyung Lee
电阻镦粗对接焊中的热分布
DOI：
--
发表时间：
2009
期刊：
影响因子：
--
作者：
N. Kerstens;I. Richardson
通讯作者：
I. Richardson
DOI：
--
发表时间：
2011
期刊：
影响因子：
--
作者：
Guo;Jinshan Li;Feng Sun;Beifang Ma;Hong
通讯作者：
Hong