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Influence Of Edge Effect On Compression Tension Fatigue Of Toughened Graphite Epoxy Laminates
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Book Synopsis Influence Of Edge Effect on Compression-Tension Fatigue of Toughened Graphite/Epoxy Laminates by : J. P. Komorowski
Download or read book Influence Of Edge Effect on Compression-Tension Fatigue of Toughened Graphite/Epoxy Laminates written by J. P. Komorowski and published by . This book was released on 1992 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results are reported of fatigue tests on a toughened graphite/epoxy (IM6/5245C) using a specimen and grip design that allows a relatively large volume of material to be tested. The loading was compression dominated (R=-3.75). Two different stacking sequences of an 18 ply laminate were tested. The lamination was typical of an aircraft wing skin (0/45/90) (44.4%,44.4%, l 1. 1 %). The specimens were 25.4mm wide, 290mm long with a gauge length of 150 mm. During the test program specimen stiffness and residual strength were measured. In parallel, local damage development was monitored using ultrasonic C-scans, photoelastic coatings and optical microscopy. The use of thin (.25 mm) photoelastic coatings to observe in-situ damage initiation and growth is new. It is based on the sensitivity of coatings to the change in mechanical properties of specimens due to damage. The C-Scan inspection results correlate closely with photoelastic observations. Results indicate that fatigue in composite specimens is dominated by the edge effect. Differences in the fatigue lives of the two stacking sequences used were close to two orders of magnitude. The proper selection of stacking sequence is crucial to achieving long fatigue lives. Under compression dominated loading fatigue damage is a local process. Damage always initiated at the edge and could be related to edge interlaminar shear stresses. The fatigue process consists of a relatively long period before initiation, usually in several locations, followed by a period of growth from one initiation site that finally leads to rapid compressive failure.
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effect of Low-Velocity Impact Damage on the Fatigue Behavior of Graphite/Epoxy Laminates by : RL. Ramkumar
Download or read book Effect of Low-Velocity Impact Damage on the Fatigue Behavior of Graphite/Epoxy Laminates written by RL. Ramkumar and published by . This book was released on 1983 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper discusses an experimental program that addressed the effect of low-velocity impact damage on the fatigue behavior of two laminates, fabricated from AS/3501-6 graphite/epoxy unidirectional tapes, with lay-ups representative of high-performance fighter aircraft wing skin lay-ups. Prior to testing, specimens from these laminates were subjected to one of two types of low-velocity impact damage. The first type was created using a blunt-tipped (1.6-cm tip diameter) impactor, and the impact energy was chosen to induce internal damage, approximately 5 cm in diameter, with no visible sign of damage on the outer surfaces. The second type of damage was created using a sharp (tetrahedral-tipped) impactor, with visible signs of damage on the impacted and opposite surfaces. Subsequent to introducing low-velocity impact damage, test specimens were subjected to static and constant amplitude fatigue loading. In the presence of compressive loads, lateral knife-edge supports were placed near the outer edge, for specimen stability, permitting unconstrained delamination growth elsewhere. Static tension and compression tests were conducted initially, and significant strength reductions due to the impact damages were measured. Fatigue load amplitudes were chosen to be fractions, S, of the static strengths. The behavior of impact-damaged specimens was investigated under tension-tension (R ? 0), tension-compression (R = -1), and compression-compression (R -> -?) fatigue loads. During fatigue, the growth in the impact damage was monitored by means of ultrasonic pulse-echo records. Fatigue life data for the various laminate-damage-loading combinations were obtained in the form of S-N curves. Interesting damage growth patterns were observed, and the criticality of each type of impact damage on the fatigue behavior of the tested laminates was assessed.
Book Synopsis Composite Materials by : Roderick H. Martin
Download or read book Composite Materials written by Roderick H. Martin and published by ASTM International. This book was released on 1986 with total page 517 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Announcements & Index by :
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1992 with total page 1496 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Effects of Compression-compression Fatigue on Balanced Graphite/epoxy Laminates with Holes by : Michael Jeffrey Graves
Download or read book The Effects of Compression-compression Fatigue on Balanced Graphite/epoxy Laminates with Holes written by Michael Jeffrey Graves and published by . This book was released on 1979 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Compressive Behaviour of Composites by : C. Soutis
Download or read book Compressive Behaviour of Composites written by C. Soutis and published by iSmithers Rapra Publishing. This book was released on 1997 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report reviews the most important studies undertaken of the compressive failure mechanisms encountered in modern composite materials. It considers first the behaviour of unidirectional laminates, followed by unnotched and notched multidirectional structures. It then considers existing theoretical models. An additional indexed section containing several hundred abstracts from the Rapra Polymer Library database provides useful references for further reading.
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 The Effect of Compressive Loading on the Fatigue Lifetime of Graphite/Epoxy Laminates by : J. T. Ryder
Download or read book The Effect of Compressive Loading on the Fatigue Lifetime of Graphite/Epoxy Laminates written by J. T. Ryder and published by . This book was released on 1979 with total page 383 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main objective of this research investigation was the effect of compressive loading on the fatigue response of graphite epoxy laminates as influenced by a circular hole and an aggressive environment. The investigation was undertake n in order to further characterize the behavior of graphite/epoxy laminates under fatigue loading. The primary emphasis of the program was on the accumulation of a statistically significant data base. Unnotched coupon properties of a quasi-isotropic and a 67% 0 degrees fiber laminate were investigated in a 82.2 degrees C (180 degrees F), 90% R.H. environment after prior conditioning in that environment. The interactional effects of absorbed moisture and fatigue loading on the fatigue lifetime of coupons containing a circular hole was investigated at room temperature and at 82.2 degrees C (180 degrees F), 90% R.H. using the quasi-isotropic laminate. The test program consisted of static tension and compression tests; tension-tension and tension-compression fatigue tests; and static tension and compression residual strength tests of coupons prior tested either under tension-tension or tension-compression fatigue loading. (Author).
Book Synopsis Composite Materials by : T. Kevin O'Brien
Download or read book Composite Materials written by T. Kevin O'Brien and published by ASTM International. This book was released on 1991 with total page 831 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Canadian Aeronautics and Space Journal by :
Download or read book Canadian Aeronautics and Space Journal written by and published by . This book was released on 1994 with total page 698 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effect of Impact Damage and Open Holes on the Compression Strength of Tough Resin/high Strain Fiber Laminates by :
Download or read book Effect of Impact Damage and Open Holes on the Compression Strength of Tough Resin/high Strain Fiber Laminates written by and published by . This book was released on 1984 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Structures and Materials Panel. Meeting Publisher : ISBN 13 : Total Pages :224 pages Book Rating :4.3/5 (243 download)
Book Synopsis The Utilization of Advanced Composites in Military Aircraft by : North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Structures and Materials Panel. Meeting
Download or read book The Utilization of Advanced Composites in Military Aircraft written by North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Structures and Materials Panel. Meeting and published by . This book was released on 1992 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applied mechanics reviews written by and published by . This book was released on 1948 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Mixed-mode Strain-energy-release Rate Effects on Edge Delamination of Composites by : Kevin T. O'Brien
Download or read book Mixed-mode Strain-energy-release Rate Effects on Edge Delamination of Composites written by Kevin T. O'Brien and published by . This book was released on 1983 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effect of Moisture on the Fatigue Behavior of Graphite/epoxy Composite Laminates by :
Download or read book Effect of Moisture on the Fatigue Behavior of Graphite/epoxy Composite Laminates written by and published by . This book was released on 1979 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Composite Materials by : H. Thomas Hahn
Download or read book Composite Materials written by H. Thomas Hahn and published by ASTM International. This book was released on 1989 with total page 421 pages. Available in PDF, EPUB and Kindle. Book excerpt: Annotation Proceedings of a symposium on [title] held April 1987, Cincinnati, OH. The majority of papers deal with composite systems of thermosetting epoxies. Some attention is given to more recent thermoplastic systems. Annotation copyrighted by Book News, Inc., Portland, OR.
