... cumulative fatigue life of composite structures. KEYWORDS: composite materials, testing, finite element analysis, fatigue life prediction, fracture mechanics, skin/flange interface Introduction Many composite components in aerospace structures are made of flat or curved panels with cocured or adhesively...

... cumulative fatigue life of composite structures. KEYWORDS: composite materials, testing, finite element analysis, fatigue life prediction, fracture mechanics, skin/flange interface Introduction Many composite components in aerospace structures are made of flat or curved panels with cocured or adhesively...

... by microscopical observations on the specimen edge. It was also shown that the fracture surfaces generated in static and fatigue DCB and MMB tests were similar. KEYWORDS: composite materials, interlaminar fracture toughness, fatigue, Mode I, Mode II, mixed-mode bend test, delamination, fractography, failure...

... Materials REFERENCE: Hussain, A. and Adams, D., The WyomingModified Two-Rail Shear Test Fixture for Composite Materials, Journal of Composites Technology and Research, JCTRER, Vol. 21, No. 4, October 1999, pp. 215 223. ABSTRACT: A significantly modified two-rail shear fixture with a new clamping concept...

... of the study are summarized in recommendations for the MMB test procedure and its subsequent evaluation. composite materials mixed-mode bend test strain energy release rate Mode I Mode II delamination tests fracture mechanics beam theory> References Reeder , J. R. and Crews , , J...

... STP 1110 , American Society for Testing and Materials , West Conshohocken PA , 1993 , p. 312 . Ozdil , F. and Carlsson , L. A. , “ Mode I Interlaminar Fracture of Interleaved Graphite/Epoxy ,” Journal of Composite Materials , Vol. 26 , No. 3 , 1992 , p. 432 . Ozdil , F...

...AL Highsmith; S Keshav The poor performance of composite materials under transverse quasi-static and impact loading is of major concern in their application as primary load carrying components in advanced structural applications. These materials sustain substantial internal damage in the form...

.... The Mode III fracture toughness was obtained from a compliance calibration method that was in good agreement with the finite element results. Mode II end-notched flexure (ENF) tests and Mode I double cantilever beam (DCB) tests were also performed for the same composite material. The Mode I fracture...

... the energy absorbing capacity of the bonded joints, a 1% SiC whisker inclusion can completely eliminate such a loss. KEY WORDS: adhesive bonding, composite materials, whisker reinforcement, SiC whiskers, ductility, repair, energy-absorbing capacity, toughened adhesive, surface preparation, interply, stacking...

...RH Martin The test methods to determine interlaminar fracture toughness of composite materials require values to be determined at delamination initiation from the thin insert. In woven composites, the location of the insert relative to the yarns will vary which may effect the toughness values...

... as compared to those of Lay-up B and this is consistent with experimental observations. KEYWORDS: composite materials, thermoplastic, semicrystalline, fatigue, cooling rate, stacking sequence, AS4/PEEK laminates, finite element analysis, crystallinity, constant strain-to-failure Thermosetting resins...

... to those for the short-beam shear test for the unidirectional glass/epoxy composite but lower shear strengths for the unidirectional carbon/ epoxy composite. KEYWORDS: short-beam shear, four-point shear, composite materials, shear tests, carbon/epoxy test methods Two specific through-the-thickness...

...GP Carman; GP Sendeckyj The published literature on the effect of optical sensors and fibers embedded in host composite materials is reviewed. The literature indicates that improperly embedded optical fibers produce local distortions and resin-rich regions in the host composite that cause...

.../8320 composite. Isothermal tensile creep/ aging test techniques developed for polymers were adapted for testing of the composite material. Time-dependent transverse (Sz2)and shear (S~) compliance's for an orthotropic plate were found from shortterm creep compliance measurements at constant, sub...

... such estimates. The structural element used in the study was a composite hip prosthesis fabricated from carbon/thermoplastic composite material. These prostheses were subjected to fatigue under an eccentrically applied load that induced compression, bending, and torsion. Factors that influence AE data...

... an important role in controlling the stxuctural performance of a composite. The ideas behind this study can be extended to characterize and analyze the interphase in metal matrix and ceramic matrix composites. KEYWORDS: composite materials, fiber-reinforced epoxies, fibermatrix adhesion, fiber-matrix...

...TK O'Brien; RH Martin This report summarizes the results of several interlaboratory “round robin” test programs for measuring the Mode I interlaminar fracture toughness of advanced fiber-reinforced composite materials. Double cantilever beam (DCB) tests were conducted by participants in ASTM...

... fracture surface morphology varying with resin microstructures and, for the case of an untoughened matrix, were consistent with what was reported in the literature for other proposed mode III fracture tests. KEYWORDS: fracture, laminates, composite materials, delamination, mode III testing, fracture...

...DM Blackketter; DE Walrath; AC Hansen A method for describing damage propagation in a woven fabric-reinforced composite material subjected to tension or shear loading is presented. A three-dimensional unit cell description of a plain weave graphite/epoxy fabric-reinforced composite was constructed...

...: composite materials, unidirectional fiber composites, fiber-matrixadhesion, fiber-matrixinterface, fiber-matrixinterphase, interphasial property modeling The authors, in Part I of this article have discussed the features that a fiber-matrix interphase may possess and reviewed several methods available...