Accession Number : ADA305631

Title :   Analysis of Porous Laminates in the Presence of Ply Drop-Offs and Fastener Holes.

Descriptive Note : Final technical rept. Jun 82-May 84,

Corporate Author : NORTHROP CORP HAWTHORNE CA AIRCRAFT DIV

Personal Author(s) : Adams, D. F. ; Ramkumar, R. L. ; Walrath, D. E.

PDF Url : ADA305631

Report Date : MAY 1984

Pagination or Media Count : 141

Abstract : Finite element analyses were carried out to predict the effects of microporosity, ply drop-offs and fastener holes on the compression behavior of AS1/3501-6 graphite/epoxy laminates. Both two dimensional (2-D) and three dimensional (3-D) analyses were performed. The validity of the analyses were established by comparing their predictions with available experimental results. The analysis of the ply drop-offs predicted little influence of their presence on the compressive strength. It also predicted that the laminate containing the Oo ply drop-off s should have about the same compressive strength in either the room temperature wet or dry states, which was also correlated experimentally. Likewise, the predicted strength reduction due to the presence of a circular hole in a specific laminate correlated well with available experimental data. (MM)

Descriptors :   *LAMINATES, *GRAPHITE EPOXY COMPOSITES, STRESS STRAIN RELATIONS, FIGHTER AIRCRAFT, FINITE ELEMENT ANALYSIS, POROSITY, STRENGTH(MECHANICS), HOLES(OPENINGS), MICROMECHANICS, COMPRESSIVE STRENGTH, THERMAL STRESSES, AXIAL LOADS, POROUS MATERIALS.

Subject Categories : Attack and Fighter Aircraft
      Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE