Abstract
Plane-stress ductile fracture of semi-crystalline polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and polybutylene terephthalate (PBT) films of thickness 0.125 mm was studied as a function of temperature using essential work of fracture (EWF) methodology. The results indicated that the specific EWF, w e, for all three materials is independent of temperature between 23 and 80°C but shows temperature dependence outside this range. The w e values for PET and PEN materials were remarkably similar and were considerably greater than the PBT values. The effect of temperature on w e was reasonably explained using COD, where σ y is the tensile yield stress of the material, COD is the crack opening displacement of the advancing crack front, and λ is a constant. The results for specific non-EWF, βw p, indicated that PEN has the highest value and PBT the lowest value at any given temperature.
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