Mechanical properties of stitched of stitched polyester resin-glass fiber laminates
Mateusz Kozioł, Józef Śleziona Politechnika Śląska, Katedra Technologii Stopów Metali i Kompozytów, ul. Krasińskiego 8, 40-019 Katowice
Quarterly No. 2, 2006 pages 19-20
DOI:
keywords: stitched laminates, mechanical properties
abstract Paper presents the results of mechanical properties investigations of the polyester resin-glass fiber laminates, both classic and of reinforcement stitched with polyaramide thread. Static bending test, static tensile test, interlaminar shear test by notched specimen tensile, Charpy impact resistance test were conducted. Characteristics dependent on in-plane strength and elasticity of laminates: flexural strength and moduli, tensile strength and moduli, impact resistance, were found visibly worse for stitched laminates compared with unstitched (Figs. 2, 3, 8, Table 1). It is from disturbations and degradation of the laminate reinforcement structure by stitching threads. Characteristics dependent on interlaminar strength and elasticity of laminates: interlaminar shear strength, viscosity index, were found better in stitched laminates than those of unstitched (Fig. 9, Table 2). The improvement is caused by stitching threads carrying translaminar loads to the reinforcement of laminate. Stitched laminates were found as having worse level of tested strength and elasticity when loading perpendicularly to the stitch direction than when loading parallel (Figs. 2, 3, 8, Table 1, 2). It is probably connected with deformation of reinforcement structure into translaminar direction, caused by tension of the stitching thread.