... investigation shows that the specimens did not buckle and that the mode of failure is a compressive material failure in the gage section of the tube. composite materials compression tubes experimental evaluation graphite-epoxy Ronald B. Bucinell 1 and Brian Roy 1 Development of a Test Method...

... not been conducted. The present study uses a fractional factorial statistical design to characterize the effects of pultrusion process variables and their interactions on the fatigue damage of pultruded graphite-epoxy. The composite material produced under the varying process conditions was subjected...

... composite material systems are discussed and procedures for reliable shear property measurements recommended. Iosipescu specimen shear modulus graphite-epoxy woven fabric particulate composite sheet molding compound (SMC) moiré interferometry Henjen Ho, 1. Haryanto T. Budiman, l? Ming-Yi Tsai...

... An experimental study was conducted to investigate the environmental effects of jet fuel absorption on the mixed-mode fracture toughness G c of AS4/3501-6 graphite-epoxy. Edge delamination tension tests of saturated and partially saturated (30/-30 2 /30/90 n ) s ( n = 1, n = 2), (35/-35...

... The resistance to crack growth exhibited by a quasi-isotropic double cracked-lap-shear specimen made of AS4/3502 graphite/epoxy materials was investigated. The factors reported earlier to influence delamination behavior such as fiber bridging, fiber breakage, and curing stresses were examined...

... In this paper, mixed-mode matrix fracture in graphite-epoxy composites was studied. Experimental investigation was conducted on a family of doubly side-notched unidirectional off-axis specimens. By varying the notch depth and the off-axis angle, a total of 28 fracture conditions of differing...

... Electron microscopy was used to analyze the fracture surfaces of T300/934 graphite/epoxy, unidirectional, off-axis tensile coupons which were subjected to 1.0 MeV electron radiation at a rate of 5.0 × 10 7 rad/h for a total dose of 1.0 × 10 10 rad. Fracture surfaces from irradiated...

... to delamination grwoth G R can be explained best in terms of the associated matrix cracking, which is observed under both static and fatigue loading. Using results from a [±30/±30/90/9¯0] s T300-5208 and a [45/0/−45/90] s XAS-914 graphite-epoxy laminate, separate power law correlations between the edge...

... method. The specimen was made of AS4/3502 graphite/epoxy material with a [±45, 0, 90] 6s quasi-isotropic balanced symmetric layup. The lap interface studied was at ±45° orientations to the loading direction. A fundamental feature of the designed specimen is its ability to be tested under net tensile...

... (25/-25/90 n ) s , n = 1/2, 1, 2, 3, 4, 6, 8, and (25 2 /-25 2 /90 2 ) s T300/934 graphite/epoxy laminate coupons were tested in tension and examined periodically by di-iodobutane (DIB) enhanced X-radiography following progressively larger increments of applied load. The tensile strain...

... The onset and growth of delaminations in unnotched [ ± 30 ∕ ± 30 ∕ 90 ∕ 90 ¯ ] s graphite-epoxy laminates is described quantitatively. These laminates, designed to delaminate at the edges under tensile loads, were tested and analyzed. Delamination growth and stiffness...

... This paper presents the results of an experimental program that was conducted to evaluate the damage to the bolt hole as related to the fit of the bolt to the hole in the graphite-epoxy laminate when the joint is subjected to a fatigue load spectrum. The experimental program was conducted using...

... The effects of a static proof testing on the statistical distribution of the static strength and fatigue life of a unidirectional graphite-epoxy laminate (AS-3501-05) are investigated experimentally. Loading mode for both the static and fatigue tests is restricted to uniaxial tension...

... The fatigue behavior of multidirectional graphite-epoxy laminates is examined and analyzed in terms of the single lamina behavior. The nonlinear viscoelastic moduli of the epoxy matrix are changed with temperature and thus the characteristics of the laminae are altered. As a result, the static...

... Ultrasonic attenuation data measured by the pulse-echo technique have been obtained versus load for two different graphite-epoxy laminates, [0, ±45, 90] s and [0, 90, ±45] s , and are presented here. The attenuation-load data display distinct changes at load values associated...