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基于自适应罚因子的变摩擦接触磨损计算方法

CALCULATION METHOD FOR VARIABLE FRICTION CONTACT WEAR BASED ON ADAPTIVE PENALTY FACTOR

  • 摘要: 磨损广泛出现在各种物体的相互接触中,准确且高效地模拟物体的接触磨损行为对研究磨损危害及其预防至关重要。本文基于罚函数接触算法和Archard磨损模型,结合考虑常数、线性和指数压力相关摩擦系数的库伦摩擦模型,构建了一个包含几何非线性、材料非线性和边界非线性等复杂非线性因素的接触磨损数值模拟方法。为了提高变摩擦系数模型的效率和精度,本文提出了自适应罚因子(VFAPF)算法,并将其应用于线弹性材料和Mooney-Rivlin超弹性材料的接触磨损行为仿真分析中。研究结果表明:相比于APF算法,VFAPF算法在变摩擦大滑移问题中具备更好的精度稳定性,当弹性滑移量占主导时,虽效率有小幅下降(约12 %),但精度的提升效果更明显(约62 %)。针对线弹性材料的小滑移接触磨损问题,尽管三种摩擦系数模型在磨损量和应力分布上存在差异,但对磨损位置和接触压力的影响较小。相比之下,在Mooney-Rivlin超弹性材料的大滑移接触磨损问题中,三种摩擦系数模型在磨损量、磨损位置、接触压力和应力分布方面均表现出显著差异,其中线性摩擦系数模型的差异性最突出。

     

    Abstract: Wear is commonly observed in the interaction between various objects, and accurately and efficiently simulating the contact wear behavior of these objects is crucial for studying the hazards of wear and its prevention. Based on a penalty function contact algorithm and the Archard wear model, combined with the Coulomb friction model that considers constant, linear and exponential pressure-dependent friction coefficients, incorporating complex nonlinear factors such as geometric nonlinearity, material nonlinearity, and boundary nonlinearity into the numerical simulation method for contact wear. To improve the efficiency and accuracy of the variable friction coefficient model, this paper proposes an adaptive penalty factor (VFAPF) algorithm and applies it to the simulation and analysis of contact wear behavior in linear elastic materials and Mooney-Rivlin hyperelastic materials. The results show that compared with the APF algorithm, the VFAPF algorithm possesses better accuracy stability in the variable friction large slip problem, and when the elastic slip is dominant, although there is a small decrease in the efficiency (about 12 %), the improvement of the accuracy is more obvious (about 62 %). For the small-sliding contact wear problem of linear elastic material, despite differences in wear gap and stress distribution among the three friction coefficient models, their effects on the wear location and contact pressure are minimal. In contrast, in the large-sliding contact wear problem for Mooney-Rivlin hyperelastic material, the three friction coefficient models show significant differences in wear gap, wear location, contact pressure, and stress distribution, with the linear friction coefficient model exhibiting the most pronounced variation.

     

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