Deformation field evolution of granodiorite specimen containing 3D surface flaw under biaxial compression
Digital speckle correlation method (DSCM) was applied to the observation of the deformation field evolution of granodiorite plate specimen containing surface flaw during biaxial loading. A DSCM post-processing method to quantitatively analyze the crack propagation was developed, by which in-depth investigation on the evolution of several main cracks during specimen fracturing was conducted. The results show that the wing cracks and anti-wing cracks emerged during specimen fracture can be classified into two different types: the former is extensional type, while the latter is extensional and shearing mixed type. Anti-wing crack is actually the trail of petal cracks which initiates and propagates from the interior of the specimen extending to the specimen surface. The anti-wing crack emerged in an isolated region at a certain distance away from the tip of flaw, and then propagates towards both directionally. The propagation speed and the deformation of anti-wing crack are far greater than those of wing crack, so anti-wing crack is a major fracture in the specimen containing surface flaw.
surface flaw digital speckle correlation method (DSCM) virtual extensometer
Y.J.Kang S.P.Ma R.H.C.Wong L.Q.Liu P.X.Liu Y.S.Guo
Dept. of Mechanics, School of Aerospace, Beijing Institute of Technology, Beijing The Hong Kong Polytechnical University, Hong Kong State Key Lab of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing
国际会议
香港
英文
1-5
2009-05-19（万方平台首次上网日期，不代表论文的发表时间）