Dynamic crack propagation and its interaction with micro-cracks in an impact problem

Candaş, Adem and Oterkus, Erkan and Irmak, Cevat Erdem (2021) Dynamic crack propagation and its interaction with micro-cracks in an impact problem. Journal of Engineering Materials and Technology, 143 (1). 011003. ISSN 0094-4289 (https://doi.org/10.1115/1.4047746)

[thumbnail of Candas-etal-JEMT-2020-Dynamic-crack-propagation-and-its-interaction-with-micro-cracks-in-an-impact-problem]
Preview
Text. Filename: Candas_etal_JEMT_2020_Dynamic_crack_propagation_and_its_interaction_with_micro_cracks_in_an_impact_problem.pdf
Accepted Author Manuscript
License: Creative Commons Attribution 4.0 logo

Download (13MB)| Preview

Abstract

The dynamic fracture behavior of brittle materials that contain micro-level cracks should be examined when material subjected to impact loading. We investigated the effect of micro-cracks on the propagation of macro-cracks that initiate from notch tips in the Kalthoff-Winkler experiment, a classical impact problem. To define predefined micro-cracks in three-dimensional space, we proposed a two-dimensional micro-crack plane definition in the bond-based peridynamics (PD) that is a non-local form of classical continuum theory. Randomly distributed micro-cracks with different number densities in a constant area and number in expending area models were examined to monitor the toughening of the material. The velocities of macro-crack propagation and the time required for completing fractures were considered in several predefined micro-cracks cases. It has been observed that toughening mechanism is only initiated by exceeding a certain number of micro-cracks; therefore, there is a positive correlation between the density of predefined micro-cracks and macro-crack propagation rate and, also, toughening mechanism.

ORCID iDs

Candaş, Adem, Oterkus, Erkan ORCID logoORCID: https://orcid.org/0000-0002-4614-7214 and Irmak, Cevat Erdem;