Plastic structural element with inserts
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United States of America Patent
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Dec 28, 2004
Grant Date -
N/A
app pub date -
Mar 31, 2000
filing date -
Mar 31, 1999
priority date (Note) -
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Abstract
Inserts of metal in the plastic of a plastic structural element are coated with a coupling layer of fibre-reinforced plastic, which reduces the abrupt change in stiffness and/or coefficient of thermal expansion at the joining interfaces in the metal-plastic composite. By altering the volume fraction of fibres and/or by different orientation of the fibre layers within the coupling layers, a gradual change in the E-modulus and the thermal expansion coefficient are produced, as a result of which abrupt changes in these values at the composite interfaces can be avoided. The sudden change in stiffness between the plastic material and the metal inset also reduced by reducing the stiffness of the insert, which again is achieved by specific choice of shape. Preferred, in particular, is a finger-shaped fanning out of the insert in the plastic material.
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