Halo approach to model cracks initiation and propagation in 3D Discrete Element Method simulation of homogeneous and heterogeneous materials

Leclerc W.; Ammar A.; Moukadiri D.; Dridi T.; Guessasma M.

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Halo approach to model cracks initiation and propagation in 3D Discrete Element Method simulation of homogeneous and heterogeneous materials

机译：光环裂缝裂缝裂缝裂缝的三维离散元件法仿真造型裂缝探讨均匀和异构材料

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The present contribution deals with an investigation of the halo approach to simulate cracks initiation and propagation in homogeneous and heterogeneous materials by Discrete Element Method using the hybrid lattice-particle model. Recent developments highlighted that the halo, which can be described as a spherical interaction domain of controlled size, enables to efficiently reduce the intrinsic dispersion of the stress in discrete modelling. This paper aims at studying the benefits of such a concept to provide suitable cracks initiation and propagation through two applications: the diametral compression test of a cylindrical tablet composed of a brittle marble and the failure process of a flax fibre/bio-based composite material. For that purpose, based on an original process ensuring the connexity within each halo during cracks propagation, numerical simulations are led to determine the influence of the halo size on the validity of stress field before damaging, and ensuing failure process with respect to theoretical expectations and finite element data. Results exhibit that a minimum halo diameter about 15 times the particles size is required to obtain proper stress fields and crack patterns, but care must be taken to avoid too large halos which could lead to excessive stress smoothing and unrealistic cracks.

机译：目前贡献涉及通过使用混合晶格粒子模型的离散元件方法来模拟裂缝引发和均匀和异质材料中的裂缝启动和传播的卤素方法。最近的发展突出显示，可以描述为受控尺寸的球形相互作用领域的光环，使得能够有效地降低应力在离散建模中的内在分散。本文旨在研究这种概念的益处，以通过两个应用提供合适的裂缝启动和传播：由脆性大理石和亚麻纤维/生物基复合材料的破坏过程组成的圆柱形片剂的径向压缩试验。为此目的，基于原始过程，确保在裂缝传播期间每个光环内的连接，数值模拟导致光晕尺寸在损坏之前对应力场的有效性的影响，以及随后在理论期望中随后的失败过程。有限元数据。结果表明，最小卤素直径约为颗粒尺寸的15倍，以获得适当的应力场和裂纹图案，但必须注意避免过大的卤素，这可能导致过度应力平滑和不切实际的裂缝。

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来源
《Composite Structures》 |2021年第3期|113222.1-113222.15|共15页
作者
Leclerc W.; Ammar A.; Moukadiri D.; Dridi T.; Guessasma M.;
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作者单位

Univ Picardie Jules Verne LTI UR UPJV 3899 F-02100 St Quentin en Yvelines France;

Univ Picardie Jules Verne LTI UR UPJV 3899 F-02100 St Quentin en Yvelines France;

Univ Picardie Jules Verne LTI UR UPJV 3899 F-02100 St Quentin en Yvelines France;

Univ Picardie Jules Verne LTI UR UPJV 3899 F-02100 St Quentin en Yvelines France;

Univ Picardie Jules Verne LTI UR UPJV 3899 F-02100 St Quentin en Yvelines France;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种 eng
中图分类
关键词
Discrete Element Method; Numerical simulation; Crack; Composite materials; Stress field;

机译：离散元素法;数值模拟;裂缝;复合材料;应力场;

Halo approach to model cracks initiation and propagation in 3D Discrete Element Method simulation of homogeneous and heterogeneous materials

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