Accession Number : ADP001910

Title :   Fractographic Analysis of Failures in CFRP,

Corporate Author : ROYAL AIRCRAFT ESTABLISHMENT FARNBOROUGH (ENGLAND)

Personal Author(s) : Purslow,D.

Report Date : JUL 1983

Pagination or Media Count : 11

Abstract : A wide-ranging fractographic research program, from the fundamental characterisation of test coupon fractures to the failure analysis of full-scale aerospace components, has been undertaken in Materials and Structures Department, RAE. This paper describes work on unidirectional CFRP test coupons in which a known mode of failure had been produced, the modes being longitudinal and transverse tension, compression and shear. From a fundamental understanding of the character of the different modes and of the mechanisms of fracture propagation it is shown how the qualitative significance of micro-defects occurring in good quality laminates may be assessed. The defects considered are fibre faults, fibre-matrix bond strength, fibre distribution, fibre alignment and voids and inclusions; these are illustrated and their individual and collective significance discussed.

Descriptors :   *Laminates, *Fiber reinforced composites, *Failure(Mechanics), *Fractography, Cracking(Fracturing), Crack propagation, Defects(Materials), Microstructure, Matrix materials, Bonding, Strength(Mechanics), Test and evaluation

Distribution Statement : APPROVED FOR PUBLIC RELEASE