Dynamic tensile behaviours of heterogeneous rocks: The grain scale fracturing characteristics on strength and fragmentation

• Published in: International journal of impact engineering Vol. 118; pp. 98 - 118
• Main Authors: Li, X.F., Li, X., Li, H.B., Zhang, Q.B., Zhao, J.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.08.2018; Elsevier BV
• Subjects: Coalescing; Compression tests; Computer simulation; Crack initiation; Crack propagation; DEM simulation; Digital imaging; Discrete element method; Dynamic tensile strength; Energy dissipation; Fracturing; Fragmentation; Granular rocks; Image processing; Indentation; Mathematical models; Micro fracturing; Rocks; Split Hopkinson pressure bars; Strain rate; Strain rate effect; Stress concentration; Stress distribution; Stress propagation; Superposition (mathematics); Tensile strength; Tension tests; Wave propagation; Dynamic tensile strength; Granular rocks; Micro fracturing; DEM simulation; Strain rate effect

•Grain scale discrete element model is proposed to study dynamic properties of rocks.•Heterogeneous rocks are reproduced and micro fracturing characteristics are investigated.•Rocks behave fragmentation transition from sparse fracture to pervasive pulverization as the strain rate increased.•Strain r...