Environmental degradation using functionally graded material approach

Due to the lack of durability data for polymer composites in South Africa, a study has been initiated to determine the effect of the South African climate on polymer composites. Laminates exposed and tested were fabricated from two different epoxy resins with woven glass reinforcement. Environmental exposure was conducted at locations with significantly different climates. Compression test results show that while epoxy 1 experienced a negligible change in strength, epoxy 2 appears to have benefited the most from possible post curing during exposure. Cracks on the surface of epoxy 2 have progressed into the laminate but have not as yet reached the first layer of woven fibre after 20 weeks of exposure.