Abstract
The overall fracture toughness of poly(butylene terephthalate) as well as plane stress and plane strain contributions have been measured as a function of rate from 5 × 10 −2 to 5 × 10 3 in/min. A pronounced sample thickness dependence in K c is observed over this range. Poly(butylene terephthalate) appears to exhibit excellent resistance to low speed crack propagation with internal voiding providing an effective crack blunting mechanism.
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