Materials Science Forum, Vol.455-456, 472-475, 2004
Residual strength in adhesive joints with a natural fibber reinforcement interface layer
This paper is concerned with a residual strength study of composite adhesive lap joints produced from a bi-directional woven E-glass fibres and polypropylene. Two different stacking sequences were tested: SC and HC. The objective was study the improvement of fatigue strength using a HC joint with a PP/hemp natural fibber layer adjacent with the bond interface. The specimens were subjected to cyclic loading with stress range of 50%, the ultimate strength and after stressed until failure. The fatigue damage quantified as the stiffness loss and failure mechanisms were analysed and discussed. Hybrid stacking composite joints present lower residual strength but seem to be less sensitive to fatigue crack propagation than the solely thermoplastic joints.