Concevoir une taxonomie des dangers : une étape clé dans l’étude de la perception du risque des mécaniciens de maintenance aéronautique

As part of our research on the perception of risk by aircraft mechanics, our objective is to evaluate how they perceive risk when exposed to different types of hazards. For this purpose, we chose to construct a taxonomy of hazards which will allows us to: 1) Meet the requirements of the International Civil Aviation Organization (ICAO), which mentions the importance of identifying hazards before assessing risks [1]. This step is also crucial to address risk perception [2]. 2) Be able to study the impact of a hazard category on mechanics' risk perception. First, two concepts must be distinguished: hazard and risk. Risk refers mainly to the probability and severity of consequences [3]. Hazard is a subjective property of an object or situation [4]. A hazard becomes a risk for the person who is exposed to it [5]. In our study, we consider the hazard as: "Anything that can injure the mechanic and/or damage the aircraft and is a result of the design of the aircraft, the GSEs and tools". This in order to be able, based on a literature review, to list the hazards, to select those that meet the definition, and finally to classify the hazards into categories and create a taxonomy

Effect of surface treatment in cork reinforced composites

This work explores the possibility of using cork for reinforcing of polypropylene (PP). The cork granules were mixed with PP by extrusion and the mixture was then injected. The hydrophilic character of cork and the hydrophobic character of PP influence negatively the adhesion at the interface between the reinforcement and the matrix. In order to improve it, several chemical modifications of the cork reinforcements were used in this work: treatment with silane, with sodium hydroxide and with a compatibilizing agent MAPP. The interface modifications were studied by scanning electron microscopy (SEM), Goniometry analysis and infrared spectroscopy analysis (IR). The improvement of the mechanical properties was demonstrated by tensile tests. On their basis it was demonstrated that the best interfacial adhesion between cork and PP is achieved by the silane chemical modification (silanization)