Abstract
Injection-moulded discs of poly(ether sulphone) impacted at 5 m sec−1 in a standard flexed-plate configuration fail by a ductile penetration process and the peak force is proportional to the specimen thickness. The peak force is reduced, and the specimen is often embrittled, if there is a machined stress concentrator at the point of impact. The simplest stress concentrator, a hole bored through the specimen, reduces the peak force by about one-third and reduces the overall ductility, even to the point of brittleness in some cases, but it does not constitute a severe notch. The results can all be rationalized in terms of the ratio of peak force to thickness.
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