Abstract
Abstract Strain gauge measurements on glass fibre-reinforced plastic ( grp ) specimens subjected to elevated temperatures indicated that shrinkage associated with post-curing is such that, should it be restrained in any way, stresses of reasonable magnitude can be developed. Laboratory tests on a thick-walled grp tube and field tests on a grp thermosiphon evaporator showed that such restraint can be developed by partial post-curing of the material due to the temperature gradients developed in service. Under these conditions residual tensile stresses are developed on the laminate side subjected to the elevated temperature and, most probably, the chemical environment. With environmentally assisted cracking being sensitive to tensile stress level, it is likely that the residual tensile stresses can contribute to the premature failure of equipment not subjected to a full post-cure prior to commissioning.
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