Dynamic Fracture Mechanics in Blasting Applications
Summary
Dynamic fracture mechanics in blasting examines the initiation, growth and coalescence of cracks in materials subjected to explosive loading. The rapid release of energy from an explosive generates stress waves that interact with pre-existing flaws, material heterogeneities and engineered discontinuities to produce complex fracture patterns. High-strain-rate conditions demand consideration of rate-dependent strength, inertial effects and non-linear wave propagation. Numerical approaches such as explicit dynamics, smooth particle hydrodynamics and coupled finite-element/particle methods have become indispensable for resolving transient phenomena. Experimental techniques including high-speed imaging, laser diagnostics and dynamic caustics have elucidated mode I and mixed-mode crack propagation, defect influence on crack path deviation and directional fracture control through shaped charges. Advances in simulation algorithms have improved predictions of optimised borehole spacing, charge geometry and decoupling ratios to achieve targeted fracture geometries with minimal overbreak. The interplay between fracture mechanics, explosive metallurgy and geo-mechanical properties underpins applications in mining, tunnelling, demolition and planetary exploration. A deeper understanding of dynamic crack evolution offers pathways to enhance fragmentation efficiency, reduce environmental impacts and improve safety in high-energy excavation operations.
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Dynamic Fracture Mechanics in Blasting Applications publication trend
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Technical terms
Dynamic stress intensity factor (KId, KIId): A rate-dependent measure of the stress field intensity near a crack tip under dynamic loading for modes I (opening) and II (sliding).
Shaped charge: An explosive configuration designed to focus detonation energy into a jet or directed wave to initiate controlled fractures along predetermined paths.
SPH-FEM coupling: A numerical technique combining smooth particle hydrodynamics and finite-element methods to model both discontinuous fracture and continuous stress wave propagation.
Radial decoupling coefficient: The ratio of borehole radius to charge radius, influencing the stress distribution and resulting fracture length in explosive blasting.
Dynamic caustics: An optical method for visualising the evolving stress field around moving crack tips under high-rate loading conditions.
References
- Research on the Seam Formation Mechanism of Elliptical Bipolar Linear Directional Blasting Based on the SPH‐FEM Coupling Method. Shock and Vibration (2021).
- Study on Dynamic Evolution Law of Blasting Cracks in Elliptical Bipolar Linear Shaped Charge Blasting. Shock and Vibration (2021).
- Study on the Dynamic Evolution of Through‐Crack in the Double Hole of Elliptical Bipolar Linear‐Shaped Charge Blasting. Shock and Vibration (2021).
- Investigation of the Blast-Induced Crack Propagation Behavior in a Material Containing an Unfilled Joint. Applied Sciences (2020).
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