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Caustic study on blast-induced wing crack behaviors in dynamic–static superimposed stress field

Authors :
Liyun Yang
Renshu Yang
Guanglong Qu
Yufei Zhang
Source :
International Journal of Mining Science and Technology, Vol 24, Iss 4, Pp 417-423 (2014)
Publication Year :
2014
Publisher :
Elsevier, 2014.

Abstract

This paper studies blast-induced wing crack behavior in a dynamic–static superimposed stress field using high-speed photography in combination with the optical method of caustics. With a static–dynamic loading setup, four PMMA plate specimens with pre-existing cracks under different static loading and the same dynamic loading were tested to observe the mechanical characteristics and the kinematic characteristics of blast-induced wing cracks during the propagation process, including crack length, crack velocity and dynamic stress intensity factor (SIF) at the crack tip. The results show that the behavior of the blast-induced wing crack is affected by the explosion stress wave and initial static stress, and the initial static stress with the direction being perpendicular to the wing crack propagation direction hinders crack propagation. Furthermore, the boundary constraint condition of the specimen plays an important role on the behavior of the crack propagation in the experiment. Keywords: Dynamic–static superimposed stress field, Blast-induced wing crack, Pre-existing crack, Caustics

Details

Language :
English
ISSN :
20952686
Volume :
24
Issue :
4
Database :
Directory of Open Access Journals
Journal :
International Journal of Mining Science and Technology
Publication Type :
Academic Journal
Accession number :
edsdoj.365e4e3b387147c7a782235f2942641f
Document Type :
article
Full Text :
https://doi.org/10.1016/j.ijmst.2014.05.001