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Low Cost, Fireproof, and Light Aircraft Interior

Sardou Societe Anonyme-Max Sardou
  • Technical Paper
  • 2019-01-1857
To be published on 2019-09-16 by SAE International in United States
Low cost, fireproof, and light aircraft interior Fire is a dramatic issue in aircraft nowadays, especially with composite air crafts. An additional issue is the dangerous use of flammable Li-Ion batteries in a lot of appliances. we propose in order to avoid dramas to produce aircraft interiors, fire doors, cargo bay walls, as well than cargo container able to contain a fire inside them, with our ceramic composite called TOUGHCERAM ®. We have developed a low-cost, ceramic, damage tolerant, this ceramic is flexible between minus 100°C and plus 350°C. TOUGHCERAM ® poly-crystalize between 60°C and 110°C and can be reinforced with fibbers like carbon or basalt one. TOUGHCERAM ® survive 90 minutes to a propane 1900°C torches. TOUGHCERAM ® does not burn, nor smoke. In this paper we will explain how it is possible to develop a fully mineral ceramic offering such unique mechanical and fire properties.
 

Composite Components for Vehicle Lightweight: Springs, Wishbones, Low-Cost Hydrogen Tanks, Demise of Astronautic Composite Overwrapped Pressure Vessel

Sardou Societe Anonyme-Max Sardou
Published 2019-04-02 by SAE International in United States
SARDOU SAS has invented in 1992 composite “C” springs (patented in 1993), these springs where offering a high energy density of 1350 joules per kilogram (compared to 300 for steel springs). This huge energy density means a potential 78% weight savings! But in the last century, weight saving was less important and platform managers were reluctant to use anything other than coil springs. So, in 2002, in order to comply with their wishes, SARDOU SAS invented composite coils springs. Easy to fit in standard suspensions, Composite coils springs are the optimum choice for McPherson-strut suspensions. As weight saving is now mandatory, composite springs, are the best choice for automotive suspensions, offering a 50% weight saving compared to steel. A Joint Venture, between SARDOU and SOGEFI Suspensions SA called S.ARA, was created in 2008 in order to mass produce composite coils springs; the official Start Of Production happen in 2014 for AUDI. This SOP has demonstrated the viability of producing composite springs. This paper describes the benefits of composite springs including the so called ‘C’ springs,…
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Composite Springs for: Suspension Vehicles, Spacecraft Stage Separation, and Satellite Ejection on Orbit

Sardou Societe Anonyme-Max Sardou
Published 2018-04-03 by SAE International in United States
SARDOU SAS has developed highly stressed composites parts for 36 years. SARDOU SAS and QUALITY INDUSTRIAL PRODUCT jointly invented and patented composite “C” springs in 1993. We have designed and tested “C” springs, giving an energy density of 1350 Joules per kilogram (compared to 300 Joules for steel springs). This energy density means a potential 78% weight savings! But in the last century, weight savings was not a must and platform managers were reluctant to use anything else than coil springs. So in 2002, in order to comply with their wishes, we have invented and developed composite coils springs. Composite coils springs are the best choice for McPherson suspensions. We have identified that the weak point, in composite coils springs, is its epoxy matrix. During heavy loading, the matrix undergoes micro cracking. Then, during repeated loadings, micro cracks propagate and merge, transforming the matrix into a fine powder. As a result, composite coil springs, using classic epoxy, were ruined after only 100.000 cycles or less. Based on this finding we have developed our matrix reinforcing technology called…
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EPOSIL® for Automotive Suspension Components, Coils Springs and High Pressure Vessels

SAE International Journal of Passenger Cars - Mechanical Systems

Qip Sarl-Patricia Djomseu
Sardou Societe Anonyme-Max Sardou
  • Journal Article
  • 2015-01-1314
Published 2015-04-14 by SAE International in United States
SARDOU SAS has developed highly stressed composites parts for 35 years. SARDOU SAS and QUALITY INDUSTRIAL PRODUCT invented composite coils springs in 2002. Developing composite coils springs, we have faced a big challenge, how to increase the short life expectancy of this highly stressed structure?We have identified that the weak point, in composite coils springs, is its epoxy matrix. In fact, during heavy loading, the matrix undergoes micro cracks. Then, during fatigue, micro cracks propagate and merge, transforming the matrix into a fine powder. The composite coil suspension springs, using, classic epoxy, where ruined after only 100,000 cycles in the best cases. The fact to integrate “functionalized silica aggregates”, in the matrix, enable the springs to exceed 1,000,000 cycles, with the same spring design. In addition, the spring stiffness has increased by 6% and the thermal set has reduced by 1.6%. Based on these results we have worked, over 7 years, to develop, refine, and improve the efficiency and to reduce the cost of our technology.
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The Revolution of Very Low Noise Level Fans

SNCF-M. Willaime
Sardou S.A.-Max Sardou
  • Technical Paper
  • 963378
Published 1996-11-05 by Societe des Ingenieurs de l'Automobile in France
Sardou S.A. was created in 1980. The company carried out its first propeller creation in 1983 ( a 350-watt fan for a wind tunnel with a conveyor belt).During aerodynamic studies carried out by Sardou S.A. for SNCF and GPI in the framework of the EUROSTAR project, we found that this train ran the risk of having a very noisy fan system. We therefore decided to devote ourselves to the numerical modeling of fans, beginning in 1992.Our objective was to perfect a fan design that was silent if possible.After a thorough bibliographical study we noted that the sate of the art with regard to the calculation of noise emitted by fans was very rough.We thus devoted two years to the creation and perfection of a numerical simulation program which included a standard fan calculation part coupled with a sophisticated acoustic calculation.Even before a fan is constructed, our model gives us the acoustic power of the projected machine.This helps us to develop its definition and to finely tune it during bench tests.Thanks to this program and to…
 

A Composite Material Compression Spring Capable of Replacing a Helicoidal Spring

Sardou R and D-Max Sardou
  • Technical Paper
  • 943472
Published 1994-06-08 by Societe des Ingenieurs de l'Automobile in France
Sardou, S.A. has been involved in composite spring studies since 1983. After a description of previous studies on composite torsion springs and Sardou S.A.'s specific composite materials facilities, the concept of compression springs is introduced, and an explanation is given as to how they differ from leaf and hairpin springs. Experimental results and potential applications are described.Composites excel in springs because they offer a considerable lifespan, and significant new integration potential and mass gains. Sardou, S.A. has made enormous progress in spring design, especially in their industrialization potential: pace, repetitiveness, quality, and cost. Composite spring technique is therefore currently in a position to pursue series production within competitive price margins in relation to metallic technologies
 

The Sensitivity of Wind-Tunnel Data to a High-Speed Moving Ground for Different Types of Road Vehicles

Sardou S.A.-Max Sardou
Published 1988-02-01 by SAE International in United States
SARDOU S.A. started as an aerodynamic consulting company using rented wind tunnels with moving or stationary ground. The company was involved in the racing car and low-drag research business.During its work, it appeared that it was necessary to use a moving ground and a high Reynolds number wind tunnel for this work.As there was no facility available giving both high air speed and ground motion, the company built its own wind tunnel.This paper presents and analyzes results in the Max Sardou Wind Tunnel (MSWT) with trains trucks, sedan cars and racing cars.
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Moving Ground and Reynolds Effect on Tractor-Trailer

M.S.W.T. and Sardou S.A. Saint-Soupplets-France-Max Sardou
Published 1987-01-20 by SAE International in United States
A tractor-trailer at 1/10 scale has been tested in the Max Sardou Wind Tunnel (MSWT). This model is with four axels and free rotating wheels.We have produced 16 very different configurations. Each configuration has been tested in line (yaw = 0°) and with 5° of yaw (32 sub configurations); For each configuration, we have mesured six components properties of the model at low speed (33,5 m/s), with stationary and with moving ground; and then, at high speed (51 m/s), also with and without moving ground.So, we get 4 groups of 32 measures per type of measurements. Population of each group seems reasonably big enough in order to justify a statistical analysis of the ground motion effect and of speed of the test.In order to help this analysis, we have add for two configurations Reynolds tests (between 17 and 51 m/s with 5 m/s steps). These Reynolds tests have been conducted in belt on and belt off mode.
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