Investigation of the rate dependence of fracture propagation in rocks using digital image correlation (DIC) method. (April 2015)

• Record Type: Journal Article
• Authors: Gao, G.; Yao, W.; Xia, K.; Li, Z.
• Is Part Of: Engineering fracture mechanics. Volume 138(2015)
• Page Start: 146
• Page End: 155
• Publication Date: 2015-04
• Subjects: Dynamic fracture toughness -- Fracture velocity -- Digital image correlation -- Loading rate -- SHPB -- NSCB; Fracture mechanics -- Periodicals; Rupture, Mécanique de la -- Périodiques; Fracture mechanics; Periodicals; 620.112605
• DOI: 10.1016/j.engfracmech.2015.02.021
• Languages: English
• ISSNs: 0013-7944

Abstract

Highlights: 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. Abstract: 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.