Accession Number : ADA251659


Title :   Finite Element Analysis of Free-Edge Delamination in Laminated Composite Specimens


Descriptive Note : Final rept. 1 Jul 85-30 Jun 90,


Corporate Author : OHIO STATE UNIV RESEARCH FOUNDATION COLUMBUS


Personal Author(s) : Sandhu, R S ; Wolfe, W E ; Sierakowski, R L ; Chang, C C ; Chu, H R


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a251659.pdf


Report Date : 18 Jun 1991


Pagination or Media Count : 194


Abstract : A mixed-type finite element formulation based on minimization of potential energy, and censuring continuity of displacements as well as tractions, is developed to analyze the free-edge delamination problem in composite laminate coupons under uniform longitudinal strain. In this model, compatible cubic interpolation functions, originally proposed by Felippa for plate bending analysis, were used for defining the displacement field within each element. To ensure traction continuity, the nodal displacement components and their gradients normal to element boundary were transformed to a mixed set of degrees of freedom through appropriate displacement-traction relationships. Thus, for global assembly, the nodal degrees of freedom include interlaminar traction components at the corner nodes, as well as traction components at the mid-side nodes of each element. This ensures continuity of displacement and traction along interelement boundaries as well as across laminate interfaces.


Descriptors :   *LAMINATES , *FINITE ELEMENT ANALYSIS , DISPLACEMENT , INTERPOLATION , DELAMINATION


Subject Categories : Laminates and Composite Materials
      Numerical Mathematics


Distribution Statement : APPROVED FOR PUBLIC RELEASE