A new simulation approach to characterizing the mechanical and electrical qualities of a connector contact
A new simulation approach to characterizing the mechanical and electrical qualities of a connector contact
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一种表征连接器触点机械和电气质量的新仿真方法
DOI：
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发表时间：
2010
期刊：
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通讯作者：
H. Schlaak
中科院分区：
文献类型：
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作者：
M. Leidner;H. Schmidt;M. Myers;H. Schlaak
总结由于电子产品的不断小型化，连接器触头设计必须遵循相同的趋势。低力连接器触头的机械和电气性能的预测变得越来越重要。本文提出了一种新的方法来模拟两个受压力和剪切力作用的多层粗糙体的弹塑性接触。将提出三个主要考虑因素。1.为了研究表面形貌对接触性能的影响，测量的三维数字化表面并不总是可用的。因此，一个“真实的”粗糙表面的数值描述是非常重要的。可以表明，工程表面可以由五个尺度无关的参数来建模：RMS粗糙度，x/y相关长度，峰度和偏斜。2.基于Papkovich Neuber势，结合多重网格法和共轭梯度法，建立了一种计算接触系统应力和变形的数值算法。各个接触点（a点）的塑性变形可以使用不同的材料硬化行为进行插值。3.如果a点分布已知，则可以计算真实接触区域的收缩电阻。通过迭代求解拉普拉斯方程来插值接触体内的电压降。还考虑了接触层的不同电特性以及各个a点的相互作用。利用Au/Ni/CuSn 6接触系统对仿真算法进行了验证。结果表明，在1克至250克的法向力范围内，测量和模拟接触电阻结果之间具有良好的一致性。该算法实现了一个'易于使用'的窗口界面“第一次接触”。该软件还集成了一个材料数据库，当与表面建模器一起使用时，可以快速计算和3D可视化所有机械和电气接触特性。
Summary Due to ongoing miniaturization in electronics, connector contact designs have to follow the same trends. The prediction of the mechanical and electrical performance of low force connector contacts becomes increasingly important. This paper shows a new approach to model the elastic plastic contact of two multi-layered nonconforming rough bodies subjected to pressure and shear traction. Three main considerations will be presented. 1. To investigate the influence of the surface topography on contact performance, measured three dimensional digitized surfaces are not always available. Hence a numerical description of a ‘real’ rough surface is of great importance. It can be shown that an engineering surface can be modeled by five scale independent parameters: RMS roughness, x/y correlation length, kurtosis and skew. 2. Based on Papkovich Neuber Potentials and both multi grid and conjugate gradient methods, a numerical algorithm has been developed to calculate the stresses and deformations in a contact system with up to three different layers per contact partner. The plastic deformation of the individual contact points (a-spots) can be interpolated using different material hardening behaviors. 3. If the a-spot distribution is known, the constriction resistance of the true contact area can be calculated. The voltage drop inside the contacting bodies is interpolated by solving the Laplace equation iteratively. The different electrical properties of the contact layers as well as the interaction of the individual a-spots, is also taken into account. The simulation algorithms are validated using a Au/Ni/CuSn6 contact system. The results show excellent agreement between measured and simulated contact resistance results over a normal force range from 1 gram up to 250 grams. The algorithms are implemented with an ‘easy to use’ windows interface “First Contact”. The software also incorporates a material database that when used together with a surface modeler, allows for the fast calculation and 3d visualization of all mechanical and electrical contact characteristics..