当前位置: X-MOL 学术Def. Technol. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
An efficient SPH methodology for modelling mechanical characteristics of particulate composites
Defence Technology ( IF 5.1 ) Pub Date : 2020-04-07 , DOI: 10.1016/j.dt.2020.04.003
Z.J. Zheng , S. Kulasegaram , P. Chen , Y.Q. Chen

Particulate composites are one of the widely used materials in producing numerous state-of-the-art components in biomedical, automobile, aerospace including defence technology. Variety of modelling techniques have been adopted in the past to model mechanical behaviour of particulate composites. Due to their favourable properties, particle-based methods provide a convenient platform to model failure or fracture of these composites. Smooth particle hydrodynamics (SPH) is one of such methods which demonstrate excellent potential for modelling failure or fracture of particulate composites in a Lagrangian setting. One of the major challenges in using SPH method for modelling composite materials depends on accurate and efficient way to treat interface and boundary conditions. In this paper, a master-slave method based multi-freedom constraints is proposed to impose essential boundary conditions and interfacial displacement constraints in modelling mechanical behaviour of composite materials using SPH method. The proposed methodology enforces the above constraints more accurately and requires only smaller condition number for system stiffness matrix than the procedures based on typical penalty function approach. A minimum cut-off value-based error criteria is employed to improve the computational efficiency of the proposed methodology. In addition, the proposed method is further enhanced by adopting a modified numerical interpolation scheme along the boundary to increase the accuracy and computational efficiency. The numerical examples demonstrate that the proposed master-slave approach yields better accuracy in enforcing displacement constraints and requires approximately the same computational time as that of penalty method.



中文翻译:

一种用于模拟颗粒复合材料力学特性的有效SPH方法

颗粒复合材料是在生物医学,汽车,航空航天(包括国防技术)中生产众多先进组件的广泛使用的材料之一。过去已经采用了多种建模技术来对颗粒复合材料的机械行为进行建模。由于其良好的性能,基于粒子的方法提供了一个方便的平台来对这些复合材料的破坏或断裂进行建模。光滑粒子流体动力学(SPH)是此类方法之一,在拉格朗日环境中,其显示出对颗粒复合材料的失效或断裂建模的极佳潜力。使用SPH方法对复合材料进行建模的主要挑战之一取决于处理界面和边界条件的准确而有效的方法。在本文中,提出了一种基于主从方法的多自由度约束,在利用SPH方法对复合材料的力学行为进行建模时,施加了必要的边界条件和界面位移约束。与基于典型惩罚函数方法的过程相比,所提出的方法可以更准确地实施上述约束,并且对于系统刚度矩阵仅需要较小的条件数。基于最小截止值的误差准则被用来提高所提出方法的计算效率。另外,通过沿边界采用改进的数值插值方案以提高精度和计算效率,进一步增强了所提出的方法。

更新日期:2020-04-07
down
wechat
bug