... in the test protocol before standardization, are discussed in this paper. 20 05 2003 27 08 2003 delamination composite fracture toughness mixed-mode MMB testing References Reeder , J. R. and Crews , J. H.   Jr. , “ Mixed-Mole Bending Method for Delamination Testing...

... and significance of several factors to the mode I delamination fracture toughness of a composite structure. The factors tested were selected based on their degree of influence on the fracture toughness and their tailoring adjustability. Considering these two criteria, the most important factors in optimizing...

... of bonded interfaces, and interface fracture toughness data are experimentally obtained for dry and wet conditions. The specimens are designed by the Rayleigh-Ritz method to achieve a linear rate of compliance with respect to crack length. The proposed CDCB specimen is an efficient tool to evaluate Mode I...

...RV Valentin; LM Butkus; WS Johnson A multi-faceted study was performed to investigate the durability of a boron-epoxy doubler (patch) adhesively bonded to an aluminum substrate. Double cantilever beam (DCB) specimens were tested to determine the fracture toughness and fatigue characteristics...

...U Hansen; JW Gillespie, Jr Mode I intralaminar fracture toughness G IC of graphite fiber-reinforced bismaleimide (X5260/G40-800) has been studied experimentally using double edge notch (DEN) specimens and three-point-bend specimens. The intralaminar fracture toughness was found to depend...

...J Li; SM Lee; EW Lee; TK O’Brien An analytical and experimental investigation was carried out on G40-800/R6376 graphite/epoxy laminates to evaluate the edge crack torsion (ECT) test as a candidate for a standard Mode III interlaminar fracture toughness test for laminated composites. The ECT test...

...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...

...SM Lee A new fracture toughness test, the edge crack torsion method, has been developed for characterizing the mode III delamination behavior of composites. The test is based on a laminate specimen subjected to torsion to propagate an edge delamination crack in its midplane. The crack growth mode...

... data, such as the fracture toughness, the strengths of the panels in presence of the cracks are predicted. Finally, all panels are tested in four-point bending, and it is found that the experimentally measured and the predicted strengths agree well. sandwich construction cellular foam thermography...

... durability properties. KEYWORDS: polymer composites, test methods, standardization, reinforcement, matrix, glass transition temperature, dynamic mechanical analysis (DMA), tensile, compressive, shear, fracture toughness, instrumented impact, fatigue, combined effect This paper addresses the need to create...

... for Strength, Fracture Toughness, and Environmental Effects ,” NASA Report TM-83696, National Aeronautics and Space Administration , Washington, DC, 1984 . Chamis , C. C. , Lark , R. F. , and Sinclair , J. H. , “ Mechanical Property Characterization of Intraply Hybrid Composites ,” NASA...

... particles fracture of SiC begins to dominate. The fracture process in the matrix is influenced by residual hydrostatic tension and high density of dislocations generated at SiC/Al interfaces. Crack initiation fracture toughness does not depend on SiC particle size, for particle sizes less than 20 μm. Crack...

... toughness of composites. Thin adherends, on the order of three plies thick, have been used successfully in the past for determination of fracture toughness of rather brittle matrix systems. However, the tougher matrices now being considered for composite applications require thicker adherends in order...

...M Blikstad; TR Johannesson Hygrothermal effects on the fracture toughness of unidirectional graphite/epoxy laminates of two different grades have been investigated. The material systems used are Fiberite T300/1034 and the more ductile Fibredux T300/920. The fracture toughness in terms...

..., fracture mechanics, fracture toughness, damage tolerant design, thick laminates The fracture behavior of notched laminated composites has been the subject of numerous investigations during the last 15 years. These investigations have attempted to address two fundamental issues. First, is there a material...