基于并行有限质点法的界面断裂-接触行为分析

INTERFACE FAILURE AND CONTACT ANALYSIS BASED ON PARALLELIZED FINITE PARTICLE METHOD

界面断裂、摩擦接触等行为广泛存在于结构破坏、连续倒塌、上下部结构协同等实际工程的精细化分析中。有限质点法对于强非线性行为模拟的适应性以及并行计算能力的优势使其可以以较低的成本完成界面行为的细观模拟。该文提出了适用于有限质点法并行计算体系下的三角形界面单元,用于通用化地模拟界面之间的粘结、断裂、接触等界面作用行为。基于并行化的有限质点法计算框架,该文详述了并行化的作用对侦察,并介绍了基于等加速度的粘结作用、基于内聚力模型的断裂作用,以及基于罚函数法的接触作用这三种作用下的状态判据和作用力计算方法。依托于有限质点法通用计算平台FPM,通过模拟界面行为的数值算例的形式对此界面单元的计算效果进行了正确性和有效性验证。

Behaviors such as interface failure and contact widely exist in refined simulations of structural failure,progressive collapse and foundation-soil interaction.As a novel numerical method,the finite particle method(FPM)is well adapted to structural analyses of strong nonlinear behaviors,with the advantage of improving computational efficiency through parallel computing.These merits make it possible for FPM to conduct fine interface simulations at a lower cost.A universal triangular interface element is proposed in the parallelized FPM framework for simulating interface behaviors such as bonding,cracking and contact.The parallel strategy for the interaction-pair search is introduced first.Then,the state criterion and mechanical models of three types of interface behaviors,namely the acceleration-based interface bonding,the cohesive-zone-based interface cracking and the penalty-based interface contact,are discussed.Using a self-developed universal computational platform of FPM,numerical tests of interface behaviors of this interface element are conducted to validate its accuracy and effectiveness.