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Diboine, A.
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Improvement in car-to-car computability~Physics, design constraints, and assessment test methodology and criteria

Renault-A. Diboine, P. Delannoy
  • Technical Paper
  • 2002-04-0063
Published 2002-05-28 by Institution of Mechanical Engineers in United Kingdom
Accident studies conducted during the last twenty-five years clearly show that car-to-car, head-on collision is a major impact configuration to take into account in order to improve safety on the roads. With new self-protection ratings all cars offer equivalent behavior against a fixed obstacle. So, in the future, the main progress will have to be made in car-to-car compatibility.Recent studies have shown the feasibility of designing compatible cars for both structure behavior and occupant protection. However, some requirements on front unit design could make this aim more difficult to achieve. We suggest developing a more comprehensive approach in order to better take into account all the constraints.In addition to improve car-to-car compatibility, we propose: first, to create homogeneous front ends to avoid energy deficiency (partner protection). And then, to control the crush force level of vehicles by both enforcing a minimum resistance of the passenger compartment (self-protection) and putting under control the energy absorption of the front unit of the car.A testing procedure against deformable barrier is also proposed and presented to verify the aggressiveness…
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Comparison of Thoracic Injury Risk in Frontal Car Crashes for Occupant Restrained without Belt Load Limiters and Those Restrained with 6 kN and 4 kN Belt Load Limiters

J-Y. Foret-Bruno, X. Trosseille, Y. Page, J-F Huère, J-Y. Le Coz, J-C Coltat
CEESAR-T. Phalempin, D. Villeforceix, P. Baudrit, H. Guillemot
Published 2001-11-01 by The Stapp Association in United States
In France, as in other countries, accident research studies show that a large proportion of restrained occupants who sustain severe or fatal injuries are involved in frontal impacts (65% and 50%, respectively). In severe frontal impacts with restrained occupants and where intrusion is not preponderant, the oldest occupants very often sustain severe thoracic injuries due to the conventional seat belt. As we have been observing over the last years, we will expect in the coming years developments which include more solidly-built cars, as offset crash test procedures are widely used to evaluate the passive safety of production vehicles. The reduction of intrusion for the most severe frontal impacts, through optimization of car deformation, usually translates into an increase in restraint forces and hence thoracic injury risk with a conventional retractor seat belt for a given impact severity. It is, therefore essential to limit the restraint forces exerted by the seat belt on the thorax in order to reduce the number of road casualties.In order to address thoracic injury risk in frontal impact, Renault cars have…
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Laser Welding Thin Sheets for Car Body Structures

CETIM-J. F. Flavenot
RTM-M. Cantello, S. L. Gobbi
  • Technical Paper
  • 1992-25-0093
Published 1992-06-01 by ISATA - Dusseldorf Trade Fair in United Kingdom
The analysis of interaction between the CO2 laser beam and the surface of zinc-coated and uncoated sheets has brought about the optimization of the shielding gas and its pressure at the point where the plasma develops, for maximum absorption of the laser beam and the most uniform weld bead possible. After performing various types of weld, in overlapping seams the optimum gap and the maximum admissible gap were determined to simulate real industrial tolerance conditions, and in these conditions fatigue strength was measured on testpieces. Welding without a gap and with partial penetration of the second sheet gives the best fatigue strength.The overlapping zinc-coated sheets are correctly welded when the gap between them enables the zinc to escape. Experiments were then transferred to the automotive component, the intermediate car door pillar of the Renault partner vehicle. Rigidity and fatigue resistance were compared with that of traditionally spot-welded components and radical improvements were found.Experience was acquired regarding the potential for laser applications in industrial production equipped with systems for beam handling and sheet clamping during welding.