Accession Number : ADA304480

Title :   Evaluation of Flawed Composite Structural Components Under Static and Cyclic Loading,

Corporate Author : BOEING AEROSPACE CO SEATTLE WA

Personal Author(s) : Porter, T. R.

PDF Url : ADA304480

Report Date : FEB 1979

Pagination or Media Count : 267

Abstract : This report presents the results of a program investigating the effects of initial defects on the fatigue and fracture response of composite laminates. The structural laminates investigated were a typical angle ply laminate, a polar/hoop wound pressure vessel laminate, and a typical engine fan blade laminate. Defects investigated were full and half penetration circular holes, full and half penetration slits, and countersink holes. Results are presented showing the effects of the defect size and type on the static fracture strength, fatigue performance, and residual static strength. The results of inspection procedures are shown, describing the effect of cyclic and static loadings on damage propagation in composite laminates. The data in this study were used to define proof test levels as a qualification procedure in composite structure subjected to cyclic loading. (MM)

Descriptors :   *LAMINATES, *FIBER REINFORCED COMPOSITES, STRESS ANALYSIS, COMPOSITE MATERIALS, LOADS(FORCES), STATIC LOADS, DISPLACEMENT, COMPOSITE STRUCTURES, STRENGTH(MECHANICS), FRACTURE(MECHANICS), CRACK PROPAGATION, DEFECTS(MATERIALS), FATIGUE(MECHANICS), FAILURE(MECHANICS), ULTRASONIC TESTS, CYCLIC LOADS.

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE