Image icon  The tip of a craze in polycarbonate

 
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Description: Fibrils of oriented polymer are visible in the tip of the remnant of a craze near a fracture surface in a fractured specimen of polycarbonate. Crazes are both a precursor to cracking and a toughening mechanism in stressed polymers. They only form when a certain critical tensile stress has been attained and form perpendicular to the largest tensile principal stress. They are very fine crack-like projections from the fracture surface but are bridged by even finer material, giving approximately 50% voids. It is these fibrils which interfere with light in an otherwise transparent polymer to make the crazing visible as a whitening of the strained material.
Keywords: craze • fibril • polycarbonate (PC) • polymer
Categories: Science approaches > Deformation & failure > Fracture
Science approaches > Microstructure
Materials > Polymers & elastomers > Plastics > Thermoplastics > Polycarbonate (PC)
Testing, analysis & experimentation > Metallography
Scale > Micro
Created by: DoITPoMS, University of Cambridge
J A Curran, Department of Materials Science and Metallurgy, University of Cambridge
Published by: DoITPoMS, University of Cambridge
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Date created: 03 October 2002
Date added: 21 August 2009
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Resource ID: 1625