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Fracture toughness of PC/PBT blend based on J-integral methods

โœ Scribed by Ming Luen Lu; Feng-Chih Chang

Publisher
John Wiley and Sons
Year
1995
Tongue
English
Weight
699 KB
Volume
56
Category
Article
ISSN
0021-8995

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โœฆ Synopsis

The fracture toughness of a polycarbonate/poly(butylene terephthalate) (PC/PBT) blend was determined using three different J-integral methods, ASTM E813-81, E813-87, and hysteresis energy. The critical J values (J1,) obtained are largely independent of the crosshead speed (range from 0.5 to 50 mm/min). ASTM E813-81 and hysteresis energy methods result in comparable J,, values, while the E813-87 method estimates J1, to be 60-80% higher. The critical displacement determined from the plots of hysteresis (energy and ratio) and the true crack growth length vs. displacement is very close. This indicates that the critical displacement determined by the hysteresis energy method is indeed the displacement at the onset of crack initiation and the corresponding J1, represents a physical event of crack initiation.

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