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ISSN : 1229-3059(Print)
ISSN : 2287-2302(Online)
Journal of the Computational Structural Engineering Institute of Korea Vol.32 No.1 pp.37-44
DOI : https://doi.org/10.7734/COSEIK.2019.32.1.37

Dynamic Fracture Analysis of High-speed Impact on Granite with Peridynamic Plasticity

Youn Doh Ha1†
1Department of Naval Architecture and Ocean Engineering, Kunsan National Univ., Gunsan, 54151, Korea
Corresponding author: Tel: +82-63-469-1856; E-mail: ydha@kunsan.ac.kr

Abstract

A bond-based peridynamic model has been reported dynamic fracture characteristic of brittle materials through a simple constitutive model. In the model, each bond is assumed to be a simple spring operating independently. As a result, this simple bond interaction modeling restricts the material behavior having a fixed Poisson’s ratio of 1/4 and not being capable of expressing shear deformation. We consider a state-based peridynamics as a generalized peridynamic model. Constitutive models in the state-based peridynamics are corresponding to those in continuum theory. In state-based peridynamics, thus, the response of a material particle depends collectively on deformation of all bonds connected to other particles. So, a state-based peridynamic theory can represent the volume and shear changes of the material. In this paper, the perfect plasticity is considered to express plastic deformation of material by the state-based peridynamic constitutive model with perfect plastic flow rule. The elastic-plastic behavior of the material is verified through the stress-strain curves of the flat plate example. Furthermore, we simulate the high-speed impact on 3D granite model with a nonlocal contact modeling. It is observed that the damage patterns obtained by peridynamics are similar to experimental observations.

페리다이나믹 소성 모델을 통한 화강암의 고속 충돌 파괴 해석

하윤도1†
1군산대학교 조선해양공학과

초록

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