High shear strength pultrusion
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United States of America Patent
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Aug 18, 1998
Issued Date -
N/A
app pub date -
Jan 26, 1997
filing date -
Apr 7, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
To produce a pultrusion which can be machined without undue strength loss bidirectional woven fiber fabric is modified to be pultrudable into a high shear strength composite member. In a preferred form of the invention the fabric is pleated in the pultrusion process to create an endless wall of stacked switch-back pleated layers which defines a box beam wall in one example, and the shaft of a bolt in another. Products produced by this process have improved isotonic strength qualities over currently produced pultrusions, which are limited to unidirectional fibers, continuous fiber mats, or alternating layers of non-woven 0.degree. and 90.degree. cloth and do not have the shear strength inherent in the pleated configuration.
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