Analysis of Interface Crack in Polymer Liner Subjected to Hygrothermal Stress
Polymeric materials such as epoxy are widely used as coating layers for the containment building of the nuclear power plant. These layers may be damaged through a hygrothermal process and residual stresses can reach significant levels near the free edges, possibly leading to interface debonding or delamination. Interfacial stress singularities induced in a laminate model consisting of the epoxy coating layer and the concrete substrate is investigated using the time-domain boundary element method. The epoxy layer is assumed to be a linear viscoelastic material and moisture effects are assumed to be analogous to thermal effects. The overall stress intensity factor for the case of a small interfacial edge crack of length a has been computed.
M.H. Aliabadi, Qingfen Li, Li Li and F.-G. Buchholz
S. S. Lee "Analysis of Interface Crack in Polymer Liner Subjected to Hygrothermal Stress ", Key Engineering Materials, Vols. 324-325, pp. 1249-1252, 2006