Evaluation of residual strength of stitched polyester resin-glass fiber laminates
Mateusz Kozioł, Monika Rutecka, Józef Śleziona Politechnika Śląska, Katedra Technologii Stopów Metali i Kompozytów ul. Krasińskiego 8, 40-019 Katowice
Quarterly No. 2, 2006 pages 3-7
DOI:
keywords: stitched laminates, residual strength
abstract Residual flexural and tensile strength tests results of polyester resin reinforced with glass fibers are presented. The strength and characteristics both of classical laminates and of laminates with stitched reinforcing layers were compared. Stitched material showed visibly higher residual flexural strength (by about 50%) when compared to the classical one. Better curves shapes were observed for stitched laminates testifying more of structure free from damage after primary bending, when compared with classical laminates. Microscopic observations showed considerably lesser dimensions of delamination cracks in stitched laminates in comparison with the unstitched ones. Any significant differences in residual tensile strength were observed. It was found that tensile strength probably depends more on damage grade of reinforcing structure, than on delamination quantity in material.