Accession Number : ADA115728

Title :   Fracture Mechanics of Delamination. Initiation and Growth.

Descriptive Note : Final contract rept. 1 Oct 79-30 Sep 81,

Corporate Author : DREXEL UNIV PHILADELPHIA PA

Personal Author(s) : Wang,A S D ; Slomiana,M

PDF Url : ADA115728

Report Date : Jan 1982

Pagination or Media Count : 170

Abstract : This report describes the results from an experimental and analytical study on the fracture mechanics of delamination. Experiments have been conducted using the AS-3501-06 graphite-epoxy laminates in order to observe delamination growth of various geometrical and loading conditions. Static and fatigue crack growth under both tension and compressive loads are studied. The experiments helped to identify and isolate the most important loading, geometry and material parameters which influence the delamination processes. Predictive models are then developed to model these processes, based on the linear elastic fracture mechanics concept of energy release rate. The models are executed by a finite element routine which simulates the crack growth process. Extension of the energy method to the growth process under constant amplitude fatigue loads leads to the concept of constant damage states. This concept is readily applied in a cumulative damage model for fatigue under spectrum loading. (Author)

Descriptors :   *Composite materials, *Epoxy laminates, *Graphited materials, *Fracture(Mechanics), *Crack propagation, Finite element analysis, Numerical methods and procedures, Failure(Mechanics), Loads(Forces), Strain rate, Spectra, Defects(Materials), Deterioration, Structural properties, Compressive properties, Tensile strength, Microcracking

Subject Categories : Laminates and Composite Materials
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE