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Numerical solution of elastic bodies in contact by FEM utilising equilibrium displacement fields

机译:利用平衡位移场的有限元接触弹性体数值求解

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In this paper a new effective formulation of the computation of the statics of elastic bodies in contact isdescribed and demonstrated. Line contact, plane strain, andnegligible friction are assumed. The formulation is an extensionof the standard finite element method (FEM). With theaim to utilise the Hertz theory directly, we use the exactsolution of the elastic 2-dimensional halfspace loaded byHertzian pressure distribution and enforce the contact conditionby the method of Lagrange multipliers. In numericalexamples we have focussed on the demonstration and evaluationof the accuracy of the new formulation for selectedapplications compared with the state of the art node-to-segmentcontact algorithm implemented in the software systemADINA. Proposed formulation ismore accurate for problemswhere Hertz contact dominates the strain state, especially forsmall number of elements, whereas we obtained a fairly goodagreement with ADINAfor a more general bending problem.
机译:本文描述并演示了一种新的有效计算接触弹性体静力学的公式。假设线接触、平面应变和可忽略不计的摩擦。该公式是标准有限元法 (FEM) 的扩展。为了直接利用赫兹理论,我们利用赫兹压力分布加载的弹性二维半空间的精确解,并通过拉格朗日乘子的方法强制执行接触条件。在数值示例中,我们重点演示和评估了新配方在选定应用中的准确性,并与软件系统ADINA中实现的最先进的节点到段接触算法进行了比较。对于赫兹接触主导应变状态的问题,特别是对于少量单元,所提出的公式更准确,而对于更一般的弯曲问题,我们获得了与ADINA相当好的一致性。

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