Smoothed FE-Meshfree method for solid mechanics problems

Smoothed FE-Meshfree method for solid mechanics problems
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用于固体力学问题的平滑有限元无网格方法

DOI:
10.1007/s00707-018-2124-4
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发表时间:
2018-03
期刊:
影响因子:
2.7
通讯作者:
Zhu Yicheng
Zhu Yicheng
中科院分区:
工程技术3区
文献类型:
--
作者:
Chen Guangsong;Qian Linfang;Ma Jia;Zhu Yicheng

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本文提出了一种求解固体力学问题的光滑有限元无网格(SFE-Meshfree)方法。采用基于单位分解法的复合形函数,结合经典的等参四边形函数和径向多项式基函数,通过应变平滑技术计算系统刚度矩阵。单元中相应的高斯积分被沿着平滑单元边缘的线积分沿着代替,因此在场梯度估计过程期间不需要复合形状函数的导数。以一个汽车机械零件为算例,验证了该方法的有效性.计算结果表明,SFE-Meshfree在不增加系统自由度的情况下,具有较高的收敛速度和精度。此外,它还对网格变形具有更高的容忍度。本文还探讨了选择性光滑积分格式下的体积锁定问题。
This paper presents a smoothed FE-Meshfree (SFE-Meshfree) method for solving solid mechanics problems. The system stiffness matrix is calculated via a strain-smoothing technique with the composite shape function, which is based on the partition of unity-based method, combing the classical isoparametric quadrilateral function and radial-polynomial basis function. The corresponding Gauss integration in the element is replaced by line integration along the edges of the smoothing cells, so no derivatives of the composite shape functions are needed during the field gradient estimation process. Several numerical examples including an automobile mechanical component are employed to examine the presented method. Calculation results indicate that SFE-Meshfree can obtain a high convergence rate and accuracy without introducing additional degrees of freedom to the system. In addition, it is also more tolerant with respect to mesh distortion. The volumetric locking problem is also explored in this paper under a selective smoothing integration scheme.
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