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Fracture Toughness and Fracture Mechanisms of PBT/PC/IM Blend

Published online by Cambridge University Press:  15 February 2011

Jingshen Wu ,
Yiu-Wing Mai  and
Brian Cotterell
Jingshen Wu
Affiliation:
Centre for Advanced Materials TechnologyDepartment of Mechanical EngineeringUniversity of SydneyNSW 2006, Australia
Yiu-Wing Mai
Affiliation:
Centre for Advanced Materials TechnologyDepartment of Mechanical EngineeringUniversity of SydneyNSW 2006, Australia
Brian Cotterell
Affiliation:
Centre for Advanced Materials TechnologyDepartment of Mechanical EngineeringUniversity of SydneyNSW 2006, Australia
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Abstract

Static and impact fracture toughness of a Polybutylene terephthalate (PBT)/Polycarbonate (PC)/Impact modifier (IM) blend was studied at different temperatures. The experimental results were interpreted by the specific fracture work concept and J-integral analysis. It is found that the specific fracture work concept characterizes the impact behavior of the blend very well. In the static fracture tests the specific fracture work gives the crack initiation resistance of the blend which is consistent with the JIC value obtained. The effect of temperature was also examined and the fracture mechanisms were investigated via TEM and SEM. Extensive cavitation of the impact modifiers and plastic flow of matrix in the vicinity of the crack tip is believed to be the major toughening process of the enhanced fracture toughness.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 274: Symposium R – Submicron Multiphase Materials , 1992 , 3
Copyright
Copyright © Materials Research Society 1992

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References

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