بررسي تاثيرات پديده‌ي تخريب تابشي بر خواص مكانيكي كامپوزيت شيشه و پلي استر

SIMULATION OF ULTRAVIOLET RADIATION EFFECTS ON MECHANICAL PROPERTIES OF GLASS/POLYESTER COMPOSITES

In this research , th e ultraviolet rad iation degradation effect, as an environmental impact on the mechanical properties of Glas s/Polyester composite s, is st udied. Varions samples are manufactured using polyester resin and exposed to ultraviolet radiation . In ord er to measure t he residual strength of th e material, the samples are exposed to ultraviolet radiation in th e t est chamber for a time equal to three, six and twelve months of the real life. Residual strength t ests are performed on th e radiated and virgin samples in ord er to compare the st rengt h of these two types of specimens . After measuring th e mechani cal properties of the virgin and radiated samples, the mechanical proper ties of unidirectional and [0 /90]s cross-ply Glass /Polyester laminated composite s are analyzed using Microm echanical and Classical Lamination Plate theories. The resnlts of th e analysis ar e evaluated by performing experiment s on th e unidirectional and (O /90]s cross-ply Glass/ Poly est er laminated composit es. The results of exp eriments show a conside rable loss in transverse stiffness and shear st iffness of th e unidirectional and [0 /90]s cross-ply Glass /Polyester composite s. The results of the experiments also show that adding ultraviolet absorber additives to th e polyest er resin prevents the mechanical degr adation of th e resin under ultraviolet redaction very well.