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Content archived on 2024-04-19

LOW WEIGHT VEHICLE PROPERTIES OF ALUMINIUM ALLOYS FOR BODY STRUCTURES

Objective


Knowledge of aluminium alloys is recent and limited in comparison with steel know-how. Collection of existing data has identified actual possibilities and has selected appropriate alloys for sheet materials, cast parts and extruded profiles. Evaluation of physical and mechanical characteristics of the aluminium alloys with indication of their mechanical and thermal properties have given the engineering choices. A review of shaping processes such as deep drawing, bake hardening, casting, bending, welding, have determined better metallurgical capabilities and define the precise process conditions to be chosen. Representative specimens have been tested in simulated conditions for stiffness, fatigue, impact... for estimation of the service life behaviour of assembled structural parts. Conventional procedure tests have been performed on several high strength aluminium alloys after simulative process conditions in order to determine the levels of mechanical properties such as tensile, stiffness, impact and fatigue strength. These determinations allowed to quantify the possibility of weight reduction such as 40% using 120Mpa fatigue strength aluminium alloys (A 356 for instance) for body panels. This precompetitive work has established a guideline in the choice of materials and specification for design of vehicle and has supplied data information in forming processes for manufacturing of vehicle.
The use of aluminium alloys for vehicle body structures can result in a 40% weight saving but there are some technical barriers for their application in mass production. This project will select high strength aluminium alloys for their general behaviour in service life.Characteristics of aluminium alloys products as sheet materials, cast parts and extruded profiles will be determined for optimized design of body structure with mechanical properties testing such as tensile strength, ductility, impact strength, stiffness and fatigue resistance. Metallurgical compatibility of aluminium alloys in such shaping processes as drawing, bending, casting, heat treatment, assembling, paint baling,... will be evaluated for optimization of manufacturing processes.

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RENAULT
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9/11 AVENUE DU 18 JUIN 1940
92500 RUEIL-MALMAISON
France

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Participants (14)