ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract The surface morphology of a system of polystyrene incorporating multilayer impact-modifier particles revealed crescent-shaped traces that could be explained as the intersection of the propagating crack and the craze zones initiated by the impact-modifier particles. This view is supported by a computer simulation which showed the variation of the shape of the intersection loci with the craze velocity/crack velocity ratio. Hence, by shape comparison or direct dimensional measurement of the crack-craze intersection, the craze velocity/crack velocity ratio at any point of the fracture surface can be determined. Together with data obtained from an instrumented Charpy impact apparatus, the craze velocity and crack velocity can be calculated. These results revealed a 100-fold increase in the crack velocity over a very short distance (∼ 20 μm) during ductile-brittle transition. This method of interpreting and using fracture-surface morphology could be a very useful tool in studying the impact-modification phenomenon of the current system or other systems showing similar fracture-surface morphology.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00353039
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