Abstract
The response of polyester moulding compounds (dmc) to cyclic tensile loading has been studied by determining the residual tensile strength as a function of number of reversals. The effects of stress concentrations and exposure to hot water on this response are also discussed. It is found that there are two separate régimes of behaviour identified by the position of a change in the elastic slope of the stress/strain curve — the ‘knee’ — a point also indicated by a substantial increase in acoustic activity monitored by stress wave emission techniques. When the cyclic load level is above this knee the behaviour of dmc resembles that of ordinary glass-reinforced plastics (grp), but below this level dmc appear to be rather less sensitive to fatigue.
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