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Discrete convolution and FFT modified with double influence-coefficient superpositions (DCSS–FFT) for contact of nominally flat heterogeneous materials involving elastoplasticity
Computational Mechanics ( IF 4.1 ) Pub Date : 2021-02-19 , DOI: 10.1007/s00466-021-01980-z
Linlin Sun , Q. Jane Wang , Ning Zhao , Mengqi Zhang

The contact of nominally flat surfaces can be treated as a bilateral periodic contact problem considering the stochastic surface similarity to the asperity distribution in a representative region. This similarity treatment method can be extended to material inhomogeneities. A novel numerical model for simulating the elastoplastic contact between nominally flat surfaces of materials containing inhomogeneities or coatings is developed via extending the concept of the discrete convolution and FFT (DC–FFT) algorithm with double superpositions of influence coefficients, which is named the DCSS–FFT algorithm. Several cases are analyzed with this new algorithm to examine its convenience, efficiency, and accuracy in dealing with complicated nominally flat–flat contact problems. The effects of surface roughness and material inhomogeneity are explored, and the mechanisms of contact surface failure are discussed.



中文翻译:

离散卷积和带双影响系数叠加(DCSS-FFT)的FFT修改,用于接触名义上平坦的异质材料,涉及弹塑性

考虑到随机表面与代表性区域中的凹凸分布相似,可以将名义上平坦的表面的接触视为双边周期性接触问题。这种相似性处理方法可以扩展到材料不均匀性。通过扩展离散卷积和具有影响系数双重叠加的FFT(DC-FFT)算法的概念,开发了一种新的数值模型,用于模拟包含不均匀性或涂层的材料名义上平坦的表面之间的弹塑性接触,该模型被称为DCSS– FFT算法。使用这种新算法分析了几种情况,以检验其在处理复杂的名义上的扁平接触问题时的便利性,效率和准确性。探索了表面粗糙度和材料不均匀性的影响,

更新日期:2021-02-19
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