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A method of analyzing laminated-composite, linear-elastic plate and shell structures has been developed based on the hybrid stress finite-element model. Flat-plate elements are used for both plate and shell structures. Three quadrilateral elements designated by ELEM1, ELEMZ, and ELEMR, all with linear in-plane boundary displacement and linear in-plane stress assumptions, are chosen for use. Transverse shear deformation effects, and rotary as well as in- plane inertia, are included in all of these elements. The ELEM1 element can be applied to single-layer thin or moderately thick plates and shells. The ELEMR element can be applied to multilayer thin plates and shells, and the ELEMZ element may be used to analyze single-layer or multilayer, thin or thick plates and shells.

ian,Theodore H. H. ;ASRL-TR-172-2DAAG46-73-C-0090DA-1-B-062113-A-661AMMRCCTR-73-40*Shells(Structural forms), *Plates, *Stresses, Composite materials, Laminates, Structural properties, Thermal stresses, Shear stresses, Deformation, Computer programs, Graphics, Curve fitting, Numerical integration, FORTRAN*Finite element analysis, *Structural analysis, FORTRAN 4 programming languageTwo methods of analyzing laminated- composite, linear-elastic plate and shell structures under transient mechanical and/or thermal loadings have been developed based on the hybrid-stress finite-element model. The computer codes corresponding to these two methods were also devel-oped and tested. Both programs are capable of treating thin or thick plates and shell structures. Shells with branches and cutouts can be treated. The outputs of the present computer programs are designed such that they can be easily adapted to any of the existing criteria for the strength of laminated composites. A SURVEY OF SUCH CRITERIA IS PRESENTED. (Author, modified-PL)