Investigation of the rate dependence of fracture propagation in rocks using digital image correlation (DIC) method

•The full displacement and strain fields are measured using DIC.•The history of dynamic stress intensity factor of rocks is determined.•The effect of loading rate on dynamic fracture properties is characterized.•Dependence of fracture propagation toughness on fracture velocity is obtained. Loading r...

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Bibliographic Details
Published in:Engineering fracture mechanics 2015-04, Vol.138, p.146-155
Main Authors: Gao, G., Yao, W., Xia, K., Li, Z.
Format: Article
Language:English
Subjects:
Crack propagation
Digital image correlation
Digital imaging
Dynamic fracture toughness
Dynamics
Fracture mechanics
Fracture toughness
Fracture velocity
Loading rate
Loads (forces)
NSCB
Rocks
SHPB
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Summary:•The full displacement and strain fields are measured using DIC.•The history of dynamic stress intensity factor of rocks is determined.•The effect of loading rate on dynamic fracture properties is characterized.•Dependence of fracture propagation toughness on fracture velocity is obtained. Loading rate is the main controlling factor in dynamic failure of rocks. In this paper, digital image correlation (DIC) combined with ultra-high speed photography is utilized to study the loading rate effect of a granitic rock – Laurentian granite using notched semi-circular bend (NSCB) method. The dynamic stress intensity factors and crack tip positions are determined from the displacement fields obtained using DIC. Fracture time, fracture toughness and crack growth velocity all exhibit loading rate dependence. The dependence of fracture propagation toughness on crack growth velocity is also obtained, which is in good agreement with that reported in the literature.
ISSN:0013-7944
1873-7315
DOI:10.1016/j.engfracmech.2015.02.021