Abstract
Injection-moulded bars made from several thermoplastics have been weathered for extensive periods in Saudi Arabia. With many of the polymers multiple diamond cavities were found to develop at the surface during uniaxial tensile testing, leading to the ultimate fracture, sometimes after coalescence of neighbours to form a dominant flaw. This did not occur with unexposed specimens tested under the same conditions and the formation of multiple cavities appears to be a consequence of weathering. Examples are presented and an explanation is offered to account for this plastic fracture phenomenon in weathered polymers.
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