Unsymmetrically Laminated Composite Plates

This paper deals for the first time with a higher order displacement model.

Unsymmetrically laminated composite plates.

Postbuckling of long unsymmetrically laminated composite plates under axial compression cezar g. 5 an exact approach to the elastic state of stress of shear deformable antisymmetric angle ply laminated plates. Majeed dissertation submitted to the faculty of the virginia polytechnic institute and state university in partial fulfillment of the requirements for the degree of doctor of philosophy in mechanical engineering michael w. A typical cross section of the laminated composite plate observed by confocal microscope is shown in fig 4 regardless of the difference of stitch tension good resin impregnation was observed from the cross section observation of the laminated composite plates.

Unsymmetrically laminated composite plates. 0 2548e 10 0 3554e 12 0 1639e 16 0 7218d 10 0 7125d 19 0 6022d 16. Diaconu a 1 paul m. The buckling resistance of composite laminate.

Received in revised form 19 january 2006. Weaver b a straero research institute bucharest 77619 romania b department of aerospace engineering university of bristol bristol bs8 1tr uk received 12 july 2005. Hence structural instability becomes a major concern in safe and reliable design of the composite plates. Fiber reinforced composite materials for example consist of high strength and high modulus fibers in a matrix material.

Postbuckling of symmetrically lami nated antisymmetric angle ply and deflection of unsymmetrically laminated composite plates under mechanical and thermal loads are studied. Ds dxdy and 0 0 0 0 0 qx 0 0 000 0 q 9y o 0 0 0 def 000 d 0 0 0 0 9 qy o 3z o 0 0 0 c 000 a 8 0 4 taking the first variation of eqn 3. Reinforced steel bars embedded in concrete provide an example of fiber reinforced composites. Substitution of these nondimensional variables into eqn 2 yields m n e atdoudv t id j r3 t t a 2 t u ds r2 a sadv a 2 3 free edge effects in unsymmetrically laminated composite plates 15 where dv dxdydz.

Deformations of in plane loaded unsymmetrically laminated composite plates majed a. The present authors have also developed a simple isoparametric formulation 15 of the displacement model given by lo et al 6 for laminated plates. Buckling optimization unsymmetrically laminated plates introduction the composite laminate plates in service are commonly subjected to compressive forces which may cause buckling. A higher order theory for free vibration of unsymmetrically laminated composite and sandwich plates finite element evaluations computers structures vol.

Stitching yarns were observed on the surface of the laminated composite plates. Ds dydz def def ds dzdx. The linear buckling mode shapes used to model the postbuckling deflection are investigated. Laminated composite plates david roylance department of materials science and engineering massachusetts institute of technology cambridge ma 02139 february 10 2000 introduction.

Composite materials consist of two or more materials which together produce desirable properties that may not be achieved with any of the constituents alone.