Initiation, propagation and arrest of an interface crack subjected to controlled stress wave loading |
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Authors: | Raman P Singh Mahesh Kavaturu Arun Shukla |
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Affiliation: | (1) Graduate Aeronautical Laboratories, California Institute of Technology, Pasadena, CA, 91125;(2) Dynamic Photomechanics Laboratory, Department of Mechanical Engineering and Applied, Mechanics University of Rhode Island, Kingston, RI, 02881 |
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Abstract: | An experimental study has been conducted to investigate the initiation, propagation, and arrest of bimaterial interface cracks
subjected to controlled stress wave loading in the form of a tensile dilatational stress wave pulse. The tensile pulse is
generated by detonating lead azide explosive in a specially designed specimen. Dynamic loading of the bimaterial interface
results in crack initiation, propagation, and arrest, all in the same experiment. This failure event is observed using photoelasticity
in conjunction with high speed photography. Full field data from the experimentally obtained isochromatic fringe patterns
is analyzed to determine time histories of various fracture parameters such as the crack tip speed, the dynamic complex stress
intensity factor, the energy release rate, and the mixity. The experimental data is also used to quantify the values of the
dynamic initiation and arrest toughness and to evaluate a recently proposed dynamic interface fracture criterion.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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Keywords: | interface crack dynamic fracture stress wave loading initiation toughness arrest toughness dynamic photoelasticity |
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