Open Access

ARTICLE

Effect of Blasting Stress Wave on Dynamic Crack Propagation

by Huizhen Liu^1,2, Duanying Wan³, Meng Wang³, Zheming Zhu³, Liyun Yang^2,*

1 Key Laboratory for Old Bridge Detection & Reinforcement Technology of the Ministry of Transportation, Beijing, 100088, China
2 School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing, 100083, China
3 MOE Key Laboratory of Deep Underground Science and Engineering, School of Architecture and Environment, Sichuan University, Chengdu, 610065, China

* Corresponding Author: Liyun Yang. Email:

Computer Modeling in Engineering & Sciences 2024, 138(1), 349-368. https://doi.org/10.32604/cmes.2023.028197

Received 04 December 2022; Accepted 16 May 2023; Issue published 22 September 2023

Abstract

Stress waves affect the stress field at the crack tip and dominate the dynamic crack propagation. Therefore, evaluating the influence of blasting stress waves on the crack propagation behavior and the mechanical characteristics of crack propagation is of great significance for engineering blasting. In this study, ANSYS/LS-DYNA was used for blasting numerical simulation, in which the propagation characteristics of blasting stress waves and stress field distribution at the crack tip were closely observed. Moreover, ABAQUS was applied for simulating the crack propagation path and calculating dynamic stress intensity factors (DSIFs). The universal function was calculated by the fractal method. The results show that: the compressive wave causes the crack to close and the reflected tensile wave drives the crack to initiate and propagate, and failure mode is mainly tensile failure. The crack propagation velocity varies with time, which increases at first and then decreases, and the crack arrest occurs due to the attenuation of stress waves and dissipation of the blasting energy. In addition, crack arrest toughness is smaller than the crack initiation toughness, applied pressure waveforms (such as the peak pressure, duration, waveforms, wavelengths and loading rates) have a great influence on DSIFs. It is conducive to our deep understanding or the study of blasting stress waves dominated fracture, suggesting a broad reference for the further development of rock blasting in engineering practice.

---

Keywords

---