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Why do cracks branch? A peridynamic investigation of dynamic brittle fracture

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Abstract

In this paper we review the peridynamic model for brittle fracture and use it to investigate crack branching in brittle homogeneous and isotropic materials. The peridynamic simulations offer a possible explanation for the generation of dynamic instabilities in dynamic brittle crack growth and crack branching. We focus on two systems, glass and homalite, often used in crack branching experiments. After a brief review of theoretical and computational models on crack branching, we discuss the peridynamic model for dynamic fracture in linear elastic–brittle materials. Three loading types are used to investigate the role of stress waves interactions on crack propagation and branching. We analyze the influence of sample geometry on branching. Simulation results are compared with experimental ones in terms of crack patterns, propagation speed at branching and branching angles. The peridynamic results indicate that as stress intensity around the crack tip increases, stress waves pile-up against the material directly in front of the crack tip that moves against the advancing crack; this process “deflects” the strain energy away from the symmetry line and into the crack surfaces creating damage away from the crack line. This damage “migration”, seen as roughness on the crack surface in experiments, modifies, in turn, the strain energy landscape around the crack tip and leads to preferential crack growth directions that branch from the original crack line. We argue that nonlocality of damage growth is one key feature in modeling of the crack branching phenomenon in brittle fracture. The results show that, at least to first order, no ingredients beyond linear elasticity and a capable damage model are necessary to explain/predict crack branching in brittle homogeneous and isotropic materials.

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Acknowledgments

This research has been supported by ARO/ARL (Grant Number W911NF1010431), program manager Dr. Asher Rubinstein (ARO) and Dr. Chian-Fong Yen (ARL), and by the AFOSR’s MURI Center for Material Failure Prediction Through Peridynamics, program managers Dr. David Stargel, Dr. Ali Sayir, and Dr. Fariba Fahroo. We are grateful for all their support without which this research would not have been possible.

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  1. University of Nebraska-Lincoln, Lincoln, NE, 68588-0526, USA

    Florin Bobaru & Guanfeng Zhang

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  1. Florin Bobaru
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Correspondence to Florin Bobaru.

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Bobaru, F., Zhang, G. Why do cracks branch? A peridynamic investigation of dynamic brittle fracture. Int J Fract 196, 59–98 (2015). https://doi.org/10.1007/s10704-015-0056-8

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