Amélioration de la résistance des stratifiés pour bateaux

The material properties of over 50 different laminates made by a group of Finnish boat-yards have been measured in a large test project. Tension, compression, bending, interlaminar shear and impact tests have been carried out for all the laminates. Among others, different polyester resins, different woven and non-woven fabrics, chopped strand mat and unidirectional roving were used as basic ply materials. The effect of various parameters has been determined not only on the maximum failure strength, but also on the strain level at which the first failure occurs. Main differences between the ratio of static and impact test results of the different materials have been determined. The results show that by choosing certain material parameters efficiently, in-plane as well as impact strengths of basic boat laminates can be raised significantly. Impact testing has been developed further and a new impact test method for both single skin and sandwich laminates is proposed.