论文标题

明确的拉格朗日脆弱点方法,用于超弹性材料有限变形

An Explicit Total Lagrangian Fragile Points Method for Finite Deformation of Hyperelastic Materials

论文作者

Mountris, Konstantinos A., Li, Mingjing, Schilling, Richard, Dong, Leiting, Atluri, Satya N., Casals, Alicia, Wurdemann, Helge A.

论文摘要

这项研究探索了一种新型的显式拉格朗日易碎点法(FPM),用于超弹性材料的有限变形。与基于网格的方法(网格失真可能构成数值挑战)相反,无网状方法更适合大型变形建模,因为它们使用丰富的形状函数来近似位移。但是,这是以额外的计算开销为代价的,需要高阶正交才能获得准确的结果。在这项工作中,新型无网格方法FPM用于得出有限变形的显式总拉格朗日算法。 FPM使用简单的单点集成来精确整合盖金弱形式,因为它采用简单的不连续多项式作为试验和测试功能,即使单点正交也可以准确地结果。通过在多个案例研究中对AME的扩展和压缩的超弹性材料的扩展和压缩来评估所提出的方法。事实证明,即使对于FEM未能收敛的大变形,FPM仍保持良好的准确性。

This research explored a novel explicit total Lagrangian Fragile Points Method (FPM) for finite deformation of hyperelastic materials. In contrast to mesh-based methods, where mesh distortion may pose numerical challenges, meshless methods are more suitable for large deformation modelling since they use enriched shape functions for the approximation of displacements. However, this comes at the expense of extra computational overhead and higher-order quadrature is required to obtain accurate results. In this work, the novel meshless method FPM was used to derive an explicit total Lagrangian algorithm for finite deformation. FPM uses simple one-point integration for exact integration of the Galerkin weak form since it employs simple discontinuous polynomials as trial and test functions, leading to accurate results even with single-point quadrature. The proposed method was evaluated by comparing it with FEM in several case studies considering both the extension and compression of a hyperelastic material. It was demonstrated that FPM maintained good accuracy even for large deformations where FEM failed to converge.

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