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Induced drilling strains in glass fibre reinforced epoxy composites

2013; Elsevier BV; Volume: 62; Issue: 1 Linguagem: Inglês

10.1016/j.cirp.2013.03.089

1726-0604

J. P. Nobre, Jan-Hendrik Stiffel, Andreas Nau, J.C. Outeiro, António Castanhola Batista, Wim Van Paepegem, Berthold Scholtes,

Advanced Machining and Optimization Techniques

Residual strains induced by drilling of glass-fibre reinforced polymers (GFRPs) were determined using a hybrid experimental–numerical methodology. Experimentally, a set of GFRP specimens were drilled under well-defined tensile (calibration) stresses, using an especially designed tensile test device. To remove the effect of the initial residual stresses, this methodology considers differential stress values instead of absolute ones. Numerically, the experimental procedure was simulated using the finite element method. The induced drilling strains were determined by comparing the experimental measured strains with those calculated numerically. Clear differences between the selected drilling operations could be observed and evaluated.