论文标题

连续基因启发性的perideNegics的计算框架

The computational framework for continuum-kinematics-inspired peridynamics

论文作者

Javili, A., Firooz, S., McBride, A. T., Steinmann, P.

论文摘要

Peridynemics(PD)是一种非本地连续体配方。 PD的原始版本仅限于基于债券的互动。基于键的PD在几何上精确,其运动学类似于经典的连续性力学(CCM)。但是,它无法正确捕获泊松效应。这种缺点是通过基于州的PD解决的,但是运动学并未准确保留。连续基因启发式的Peridynemics(CPD)提供了一个几何精确的框架,其基本运动学与CCM的基础运动学相吻合并正确捕获了泊松效应。在CPD中,人们区分了一,两,二和三个纽布的相互作用。一个邻居相互作用等于原始PD形式主义的基于债券的相互作用。但是,由于连续运动学的基本要素被精确保留,因此两次和三个纽布的相互作用与国家的相互作用根本不同。这一贡献的目的是详细介绍CPD的计算方面,并提供对其实施至关重要的详细推导。通过一系列数值示例阐明了所得计算CPD的关键特征。这些包括大变形时的三维问题。所提出的策略是强大的,并且观察到与牛顿 - 拉夫森方案相关的二次收敛速率。

Peridynamics (PD) is a non-local continuum formulation. The original version of PD was restricted to bond-based interactions. Bond-based PD is geometrically exact and its kinematics are similar to classical continuum mechanics (CCM). However, it cannot capture the Poisson effect correctly. This shortcoming was addressed via state-based PD, but the kinematics are not accurately preserved. Continuum-kinematics-inspired peridynamics (CPD) provides a geometrically exact framework whose underlying kinematics coincide with that of CCM and captures the Poisson effect correctly. In CPD, one distinguishes between one-, two- and three-neighbour interactions. One-neighbour interactions are equivalent to the bond-based interactions of the original PD formalism. However, two- and three-neighbour interactions are fundamentally different from state-based interactions as the basic elements of continuum kinematics are preserved precisely. The objective of this contribution is to elaborate on computational aspects of CPD and present detailed derivations that are essential for its implementation. Key features of the resulting computational CPD are elucidated via a series of numerical examples. These include three-dimensional problems at large deformations. The proposed strategy is robust and the quadratic rate of convergence associated with the Newton--Raphson scheme is observed.

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