...R John; DJ Buchanan An optimization procedure was developed to deduce the fiber bridging stresses from crack opening displacements measured in situ during crack growth. This procedure was used to determine the bridging stress distribution during fatigue crack growth in a unidirectionally reinforced...

... role. Therefore, despite the general attention paid during drilling to reduce delamination, the optimal drilling conditions should avoid the onset of microcracks distributed in the inner part of the hole. 13 07 1999 01 11 2000 drilling damage GFRP laminate static strength fatigue...

...LE Asp; A Sjögren; ES Greenhalgh This paper presents a study on delamination growth in Mode I, Mode II and mixed mode under fatigue loading in an HTA/6376C composite. The computed slopes of the modified Paris plots were high. Therefore, threshold values of the strain energy release rate...

... (FEA) of the specimens was required. Using FEA solutions, it was determined that the fracture toughness of the environmentally exposed specimens was lower than the as-received specimens for every environment tested for both DCB and ENF specimens. KEYWORDS: durability, fatigue, composites, joints Aging...

... characterizes the 0-deg tensile behavior of unidirectional T700 carbon and E-glass reinforced epoxy composites both as received and after conditioning at a pressure of 15 mtorr and a temperature of 20 to 25°C. Constant-amplitude tension-tension cyclic fatigue tests were carried out on half the specimens...

... structural shape. The model successfully describes the onset of delamination prior to fiber failure and suggests that out-of-plane failure controls the life of the structure. delamination out-of-plane failure fatigue life prediction hybrid fiber-reinforced polymer composites References...

...LR Lawson; EY Chen This paper examines aspects of the distribution of the longest possible microcracks in specimens of a fatigued aluminum-matrix silicon carbide whisker composite and the probability of coalescence in general. The length of the longest microcracks in this material is determined...

...RW Neu; AM Patel The life-limiting loading configuration of weakly bonded unidirectional titanium matrix composites is often transverse cyclic loading. Most fatigue tests under this loading configuration have been conducted at maximum stress levels above the monotonic proportional limit. However...

...JR Calcaterra; S Mall; A Ruiz This study investigates the residual strength degradation of cross-ply, SCS-6/Ti-15-3 titanium matrix composite (TMC) due to elevated temperature fatigue. To accomplish this, several specimens were cycled at 427°C to certain fractions of their expected fatigue lives...

...TK O’Brien; JK Sen Quasi-static tension-torsion and tension-torsion fatigue tests were conducted on several candidate S2/F584 glass-epoxy flex-beam layups to establish their torsional strength and fatigue behavior in the presence of an axial load, determine typical damage mechanisms, and provide...

...T Nicholas; AH Rosenberger Fatigue life predictions are conducted for a high temperature composite for hypersonic vehicle structural applications. A SCS-6/Timetal® 21S [0/90] s composite is evaluated under thermomechanical fatigue (TMF) as well as under typical hypersonic mission profiles...

...DD Robertson; S Mall; S-M Lee Effect of fatigue loading on the residual strength of a unidirectional titanium matrix composite, SCS6/Ti-6-4, was investigated. The composite was fatigued isothermally at 427°C under load-controlled mode with an applied maximum stress of 900 MPa up to a certain...

...E Li; WS Johnson Hybrid composite laminates consisting of layers of metal foils bonded together with fiber-reinforced resin show great promise as a fatigue-resistant material. The hybrid titanium composite laminate (HTCL) incorporates the mechanical advantages of existing hybrid composite laminates...

...S Mall; EA Boyum The fatigue response of a cross-ply [0/90] 2S titanium (Ti-15-3) matrix composite reinforced with silicon carbide fibers (SCS-6) was investigated at 427°C. Tension-tension (tensile mean stress) and tension-compression (zero mean stress) loadings were applied. For the same stress...

... growth is greater in the interleafed laminates under quasi-static loading. Under fatigue loading the delamination onset life and growth rate of both baseline and interleafed laminates were found to be frequency dependent. Fractographic analysis of laminates reveals more hackles in interleafed laminates...

...JP Solti; S Mall; DD Robertson An analytical methodology is developed to model the response of unidirectional ceramic matrix composites (CMCs) under monotonic and fatigue loadings at room temperature. The analysis is presented as a first step toward analyzing the fatigue behavior of CMCs...

...NRS Vure; RD Kriz The effect of cooling rate and stacking sequence on fatigue behavior was analyzed for notched quasi-isotropic AS4/PEEK laminates. The fatigue behavior of fast (475°F/min) and slow (1°F/min) cooled specimens of the following two lay-ups was studied: Layup A of (−45/0/45/90) s...

...J Cernyar; F Yang; A Saxena The combination of superior properties and relative ease of manufacture has made metal matrix composites candidate materials for the weight-critical, damage-tolerant, and high stiffness structural applications. In this paper, the fatigue crack growth and fracture...

...BP Sanders; S Mall The present paper is a continuation of Part I to investigate the transverse fatigue behavior of a unidirectional titanium-based metal matrix composite (MMC) (SCS-6/Ti-15-3) at elevated temperature. In Part I of this paper, fatigue tests were conducted under the strain-controlled...

...BP Sanders; S Mall The transverse fatigue characteristics of a unidirectional titanium-based metal matrix composite (MMC) (SCS-6/Ti-15-3) were investigated under an isothermal condition. Fatigue tests were performed using a hybrid strain-controlled loading mode. In this hybrid control mode...