Pierre Boutet, Catherine Peyrac, André Galtier - 01/11/2011 - RC Fatigue Design…
Abstract : Since the end of the twentieth century, composite materials are of ever growing interest for companies in many sectors of industry. Among these, transport industry (particularly ground transport) is a real great actor of this change because of the competition in the performance raising and in the decreasing of polluting emissions that involves a drastic reduction of masses and inertias in movement. In addition, European instructions concerning recycling force companies to replace the use of thermosetting matrixes, which cannot be smelted, with the use of thermoplastic ones. Mastering appropriate assembly techniques allowing matching well the companies Safety Quality Delivery Costs (SQDC) requirements is thus necessary for this kind of materials.

Among all existing assembly techniques, transmission laser welding offers great perspectives. While it is well known and mastered when used on polymer materials, few studies have been performed on laser transmission welding applied to continuous fibers reinforced polymer, which are mainly used on structural parts. Taking into account the specificities of composite materials compared to classical polymers, the present work deals with the fatigue behaviour of such assemblies. The studied base material is a stratified polyamide 6.6 reinforced with 40% continuous glass fibers.

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