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Load Sequence Effects On Graphite Epoxy 352s Laminates
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Book Synopsis Load Sequence Effects on Graphite/Epoxy [±35]2s Laminates by : DL. Jones
Download or read book Load Sequence Effects on Graphite/Epoxy [±35]2s Laminates written by DL. Jones and published by . This book was released on 1983 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effect of load sequence on the fatigue behavior of composite materials is contributed by (1) the difference in residual strength when fatigue fracture occurs, referred to as the boundary effect, and (2) the material memory effect with respect to previously experienced loads. A theoretical fatigue model previously developed by the authors is generalized herein to include the memory effect. The present model permits isolation of the memory effect from the boundary effect, thus the extent of the memory effect can be identified using residual strength test results under dual-level fatigue loadings. An experimental test program using graphite/epoxy [±35]2s laminates under high-low and low-high load sequences has been conducted to generate statistical residual strength data. It is shown that the material memory effect does exist for Gr/E [±35]2s laminates, as predicted by the model. The correlation between the test results and the theoretical predictions of the median residual strength and the expected percentage of fatigue failures under dual loading is very good. However, the statistical dispersion of the residual strength test results is much smaller than that of the static ultimate strength and that predicted by the model.
Book Synopsis Stacking Sequence Effects and Delamination Growth in Graphite/Epoxy Laminates Under Compression-Dominated Fatigue Loading by : JP. Komorowski
Download or read book Stacking Sequence Effects and Delamination Growth in Graphite/Epoxy Laminates Under Compression-Dominated Fatigue Loading written by JP. Komorowski and published by . This book was released on 1995 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effect of free-edge stresses on the fatigue of graphite/epoxy laminates was evaluated numerically and experimentally. Reported are results of static and compression-dominated (R = -3.75) fatigue tests on AS4/3501-6 and IM6/5245C using unnotched specimens. Two different stacking sequences of 18-ply laminates were tested. The lamination was (0°/45°/90°) (44.4%, 44.4%, 11.1%). Damage development was monitored using ultrasonic C-scans, photoelastic coatings, and optical microscopy.
Book Synopsis An Evaluation of the Effects of Stacking Sequence and Thickness on the Fatigue Life of Quasi-isotropic Graphite/epoxy Laminates by :
Download or read book An Evaluation of the Effects of Stacking Sequence and Thickness on the Fatigue Life of Quasi-isotropic Graphite/epoxy Laminates written by and published by . This book was released on 1983 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fatigue of Graphite/Epoxy [0/90/45/-45]s Laminates Under Dual Stress Levels by : JN. Yang
Download or read book Fatigue of Graphite/Epoxy [0/90/45/-45]s Laminates Under Dual Stress Levels written by JN. Yang and published by . This book was released on 1982 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: A model previously developed by the authors to predict the effect of loading sequence on the statistical distribution of the fatigue life and residual strength of composite materials has been generalized and applied to graphite/epoxy [0/90/45/-45]s laminates. The load sequence effects have been shown to be caused in general by the difference in residual strength when failure occurs (boundary effect) and the effect of previously applied loads (memory effect). The present model permits isolation of the memory effect from the boundary effect and estimations of the magnitude of the memory effect under dual levels of fatigue loadings. The model parameters were evaluated from baseline data, including static strength, fatigue life, and residual strength tests. Predictions of the material response were then made and verified with additional fatigue life and residual strength testing. It was shown that the material memory effect is insignificant for this material and correlations between predictions of the number of early failures agreed quite well with the verification tests. Predictions of the fatigue life and residual strength degradation under dual stress levels were also in good agreement with the test results.
Book Synopsis The Effects of Frequency and Stacking Sequence on the Fatigue Behavior of Unnotched Quasi-isotrophic Graphite-epoxy Laminates by : Mangesh Hoskote
Download or read book The Effects of Frequency and Stacking Sequence on the Fatigue Behavior of Unnotched Quasi-isotrophic Graphite-epoxy Laminates written by Mangesh Hoskote and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Evaluation of the Effects of Stacking Sequence and Thickness on the Fatigue Life of Quasi-Isotropic Graphite/Epoxy Laminates by : CE. Harris
Download or read book An Evaluation of the Effects of Stacking Sequence and Thickness on the Fatigue Life of Quasi-Isotropic Graphite/Epoxy Laminates written by CE. Harris and published by . This book was released on 1985 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: A test program has been conducted in which the effect of specimen thickness on the fatigue lives of quasi-isotropic, graphite/epoxy lamintes was investigated. Three replicate specimens for each notched and unnotched geometry at 16, 32, and 64-ply thicknesses of a [90/45/0/-45]ns and [45/0/-45/90]ns laminate were tested in compression-compression fatigue. The fatigue lives of the notched specimens did not appear to be a strong function of laminate stacking sequence or specimen thickness. The stress concentration at the hole dominated over the interlaminar stresses at the straight free edge. The unnotched specimens of the [90/45/0/-45]ns laminate with tensile interlaminar normal stresses delaminated more readily than did the [45/0/-45/90]ns laminate with compressive interlaminar normal stress. The life of the 16-ply unnotched specimens was lower than was the life of the 32 and 64-ply specimens. Delaminations were located at the interface where the maximum ?xz shear stress occurred regardless of the sense of magnitude of the interlaminar normal stress. Finally, a specially designed antibuckling fixture was found to be effective in preventing out-of-plane motion without overconstraining the specimen.
Book Synopsis The Effect of Loading Parameters on Fatigue of Composite Laminates: Part V. by :
Download or read book The Effect of Loading Parameters on Fatigue of Composite Laminates: Part V. written by and published by . This book was released on 2001 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report is the fifth in a series of reports on the damage growth of notched and visible impact-damaged AS4/3501-6 graphite/epoxy quasi-isotropic laminates under long-term mechanical fatigue loading. The effects of load type, load level, load sequence, and spectrum modification are evaluated in this study. X-ray radiography is taken of the test specimens to monitor the fatigue damage, which are in the form of splitting and delamination around the center hole of a specimen. Modifying the compression-dominated loading spectrum by omitting the two lowest load levels has been found to have little effect on the propagation of damage while reducing testing time by 99.7%. Experimental results indicate that growth of split-induced delamination under constant amplitude tension-compression (T-C) fatigue occurs mostly between and along the splits in a narrow band. Under compression-compression (C-C) loading, the mode of damage growth changes from splitting to widthwise extension of delamination and fiber failure. None of the open-hole specimens failed after 10(exp 6) cycles under constant amplitude tension-tension (T-T) loading. However, x-ray radiography showed that the specimens suffered very different damage at different load levels. The residual compressive strength (RCS) is influenced by the type of damage to varying degrees depending on the load levels. In spectrum fatigue loading, residual tensile strength (RTS) were relatively unaffected while RCS was affected significantly. Thus, it is difficult to identify a single damage parameter that could be correlated to changes in strength. However, there is enough data to propose a prediction model for open-hole specimens under constant amplitude loading, which matched well with collected data.
Book Synopsis Load History-Edge Damage Studies in Two Quasi-lsotropic Graphite Epoxy Laminates by : DO. Stalnaker
Download or read book Load History-Edge Damage Studies in Two Quasi-lsotropic Graphite Epoxy Laminates written by DO. Stalnaker and published by . This book was released on 1979 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this investigation was to observe and document the details of edge damage initiation, growth, and interaction as a function of load history and determine the effect of the damage state on material properties. Quasi-isotropic graphite/epoxy specimens with two different stacking sequences were selected to study the damage behavior under both tensile and compressive out-of-plane normal stresses. Observations were made using a replication technique which allows for recording the damage detail along the edge of the stressed specimen.
Book Synopsis Effect of High Load on the Fatigue Behavior of Unnotched Graphite/Epoxy Laminates by : C. T. Sun
Download or read book Effect of High Load on the Fatigue Behavior of Unnotched Graphite/Epoxy Laminates written by C. T. Sun and published by . This book was released on 1978 with total page 53 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this research program is to verify experimentally the theoretical prediction for the effect of the high load on the fatigue behavior of unnotched composite laminates. A three-parameter fatigue and residual strength degradation model has been used to derive the number of load cycles a specimen can survive and the statistical distributions of the fatigue life and the residual strength after the specimen has survived an initial high load or periodic high loads. One set of the static ultimate strength data and one set of the fatigue scan data were generated to determine the three-parameter values appearing in the theoretical model.
Book Synopsis The Effects of Stacking Sequence on Damage Accumulation in Glass-epoxy Laminates Under Tensile Fatigue by : Daniel Brett Runkle
Download or read book The Effects of Stacking Sequence on Damage Accumulation in Glass-epoxy Laminates Under Tensile Fatigue written by Daniel Brett Runkle and published by . This book was released on 1993 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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