Abstract
The use of the specific essential work of fracture, W e, to characterize fracture of polycarbonate films is described. It is shown that the plane-stress specific essential work of fracture for polycarbonate film can be obtained from single-edge-notched-tension specimens, by extrapolating the straight-line relationship between the total work of fracture, W f, and ligament length, L, to zero ligament length. From the data, it seems that, for a given film thickness, W e is almost independent of the specimen width but increases with increasing thickness. The non-essential work of fracture as obtained from the slope of a W f versus L plot showed no significant width dependence, and for the majority of thicknesses it was almost invariant with thickness, indicating that the shape of the outer plastic zone surrounding the fracture process zone is almost invariant with the dimensions of the test specimen.
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