Measurement and Analysis of Residual Stresses and Warpage in Fiber Reinforced Plastic and Hybrid Components

Glass/carbon fiber reinforced plastic (GFRP/CFRP) and hybrid components have attracted increasing attention in lightweight applications. However, residual stresses induced the manufacturing process of these can result warpage and, eventually, negatively affect mechanical performance composite structures. In present work, GFRP, CFRP, GFRP/steel CFRP/steel were manufactured through prepreg-press-technology always employing same parameters. The measured hole drilling method (HDM), based on an adequate formalism to evaluate for orthotropic materials including calculation calibration coefficients via finite element analysis (FEA). FEA, real material lay-up properties samples considered. by was after removed from tool. four different types compared results analyzed depth. obtained be extended other even could used designing multi-stable laminates application adaptive Moreover, effects parameters HDM, e.g., speed, increment zero-depth setting, resulting GFRP investigated. reliability stress measurements using HDM validated bending tests. conclusions concerning choice optimal directly applied considered work.