ELASTICPLASTIC AD RESIDUAL STRESSES ICLAMPED THERMOPLASTIC COMPOSITE LAMIATES LOADED TRASVERSELY

Abstract-In this study, an elastic-plastic stress analysis was carried out in woven steel fibers- thermoplastic clamped composite laminates. The stacking sequences were chosen as [0/0] 2 , [15/-15] 2 , [30/-30] 2 and [45/-45] 2 for woven steel fibers – thermoplastic composites plates. The layers were chosen for symmetric and antisymmetric cases. The finite element solution was performed by using the ANSYS software. Solid 186 element was utilized in the solution. Normal stress components at the clamped edges were found to be higher than that at the mid point of the laminated plates. Normal stresses are tensile at the mid point of the clamped edges and compressive at the mid point of the laminated plates. Then, the residual stress components were calculated in the critical points of the composite laminates. Keywords-elastic-plastic stress analysis, thermoplastic composite laminates, finite element method 1. I TRODUCTIO Thermoplastic composites gain some advantages in nowadays. Since its high impact resistance and reform again very easily, the use of the thermoplastic composites increases in the industry. Ageorges et al. [1] presented a review in the advances in fusion bonding techniques for joining thermoplastic matrix composites. Trende et al. [2] investigated residual stresses and dimensional changes in the compression moulded glass-mat reinforced thermoplastic parts. Finite element calculations were used in the stress analysis. Ifo et al. [3] performed a micro mechanics analysis for tailoring glass-fiber-reinforced thermoplastic laminates. Sayman [4] carried out an elasto-plastic stress analysis in aluminum metal matrix laminated plates loaded transversely by using finite element technique. The expansion of plastic region and residual stresses were determined. Jegley [5] presented a study of the effects of, impact damage on compression-loaded graphite thermoplastic sandwich panels. Some investigations were performed in metal-matrix composite laminates using finite element methods [6-9]. Shih and Loos [10] investigated heat transfer analysis of the thermoplastic filament winding process. They determined the temperature distribution in the composite during the fabrication process by using the ABAQUS transient heat transfer finite element model. Damb and Hansen [11] developed a numerical model for prediction of the process-induced thermal residual stresses in the thermoplastic composite laminates. The