Importance

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Abstract

In this method of fabricating a hollow body, a first layer of fiber-reinforced hard-elastic plastic is formed to produce an inner layer of the hollow body with the fibers of the fiber-reinforced hard-elastic plastic extending skew to the longitudinal axis of the hollow body within a predetermined range of fiber orientation angles. A second outer layer of fiber-reinforced hard-elastic plastic is formed around the inner layer with the fibers oriented in a predetermined different range of fiber orientation angles. At least one of the layers is heated to a desired elevated temperature. At least one of the layers is subjected to a predetermined force or combination of forces. The hollow body is then cooled to the hard-elastic state, locking internal stresses into the two layers when the applied forces are removed. The resulting structure is internally stressed or pre-stressed and therefore particularly well suited to alternating directions of loading or, according to the orientation of the fibers produced, to resisting variable loads in a given direction.

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First Claim