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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.

Fire is a dramatic issue in aircraft nowadays, especially for composite air craft. An additional issue is the dangerous use of flammable Li-Ion batteries in many devices. To minimize fire issues, it is proposed to produce aircraft interiors, fire doors, cargo bay walls, and cargo containers that are able to contain a fire inside them, with our ceramic composite called TOUGHCERAM®. It is low-cost, ceramic, damage tolerant, and flexible between minus 100°C and plus 350°C. TOUGHCERAM® poly-crystalizes between 20°C and 110°C and can be reinforced with fibers (carbon or basalt). It will survive 90 minutes under direct contact with a propane torch of 1900°C. TOUGHCERAM® does not burn or smoke. This paper will explain how it is possible to develop a fully mineral-ceramic offering with unique mechanical, fire, and blast containment properties.