Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1991-07-03
1992-10-13
Aftergut, Jeff H.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156166, 156169, B65H 8100
Patent
active
051547880
ABSTRACT:
A continuous filament is selected from among a group of appropriate types of filaments, and selection of the filament length and the filament thickness is made as well. A matrix material is selected from a group of appropriate types of matrix materials. Filaments of the selected type, length and thickness are undirectionally imbedded in the selected matrix to provide a uniaxial continuously reinforced composite. The Young's modulus, E.sub.c, and the shear modulus G.sub.c, are calculated for the composite. Mathematical formulas are provided for calculation of upper and lower bounds of transverse stiffness, B. A mathematical formula is provided for calculation of critical comprehensive stress, P.sub.c. Transverse stiffness, B, is involved as one of the factors in this formula. Either one or the other of the upper bound of B or the lower bound of B are alternatively applied in calculating P.sub.c, depending upon a consideration related to the shape of a cross section of the structural member into which the composite is to be formed. If the shape of the outline of such cross section includes at least one angular break, then the lower bound of B is applied in calculating P.sub.c. If the shape of the outline of such cross section is curvilinear in its entirety, then the upper bound of B is applied in calculating P.sub.c. A structural member subjected to load values below P.sub.c will be free from load-induced microbuckling with a high degree of certainty.
REFERENCES:
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Spicola, F. C., et al, "An Algorithm for the Analaysis of Critical Stresses in Uni-Directional Fiber Laminates," The 1990 ASME Int'l Computers in Engr. Conf. & Exposition, Aug. 5-9, 1990, pp. 1-8.
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Chamis, C. C., et al., "Impact Resistance of Unidirectional Fiber Composites," Composite Materials: Testing and Design (Second Conference) ASTM STP497, American Society for Testing and Materials, 1972, pp. 324-349.
DuBois Neil J.
Spicola Francis C.
Aftergut Jeff H.
Lall Prithvi C.
McGowan Michael J.
Oglo Michael F.
The United States of America as represented by the Secretary of
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