Behavior of Advanced and Composite Structures

This final report summarizes the objectives and accomplishments of three tasks performed under one year grant from AFOSR to complete ongoing research. Task 1 is concerned with the development and validation of new bending and buckling theories for composite structures. Task 2 is the experimental inv...

Full description

Saved in:
Bibliographic Details
Main Author: Rehfield,L W
Format: Report
Language:English
Subjects:
AIR FORCE RESEARCH
BENDING
BUCKLING
Composite laminates
Composite plate theory
COMPOSITE STRUCTURES
COMPRESSIVE PROPERTIES
DAMAGE
Delamination
FAILURE(MECHANICS)
GRANTS
GRIDS
Isogrid structures
LAMINATES
Laminates and Composite Materials
Miscellaneous Materials
PE61102F
PLATES
RIBS
SHEAR STRENGTH
STIFFENING
STRAIN(MECHANICS)
THEORY
TOLERANCE
TRANSVERSE
VALIDATION
WUAFOSR2307B2
Online Access:Request full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:This final report summarizes the objectives and accomplishments of three tasks performed under one year grant from AFOSR to complete ongoing research. Task 1 is concerned with the development and validation of new bending and buckling theories for composite structures. Task 2 is the experimental investigation of the effects of delamination on the compressive buckling and postbuckling of composite laminated panels. Task 3 is an experimental evaluation of damage tolerance of composite isogrid panels. Isogrid is a stiffening concept that employs a repetitive triangular pattern of ribs. Papers, reports, and presentations resulting from this research are listed. In Task 1, new theories which include the effects of transverse shear strain, transverse normal strain, stretching related warping and bending related warping on composite laminates, orthogonally stiffened composite plates and composite isogrid plates have been developed, validated, and applied. In case of isogrid panels, comparisons of predictions for compressive buckling have been made with experiment and found to be quite good. In Task 2, the data indicate that delaminations reduce initial postbuckled stiffness. They do not influence, however, the failure process. This is because they were placed in the center of the panels and ultimate failure begin at the corners. Originator-supplied keywords include: Advanced Structures, Composite Structures, Composite Laminates, Composite Plate Theory, Delamination. Isogrid Structures. Stiffened Structures.