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Author : Muthiah Jeyaseelan
Publisher :
ISBN 13 :
Total Pages : 134 pages
Book Rating : 4.:/5 (141 download)
Download or read book Fatigue/Impact Studies in Notched and Unnotched Graphite/epoxy Composites written by Muthiah Jeyaseelan and published by . This book was released on 1986 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : V. Sarma Avva
Publisher :
ISBN 13 :
Total Pages : 158 pages
Book Rating : 4.:/5 (319 download)
Download or read book Fatigue/impact Studies in Laminated Composites written by V. Sarma Avva and published by . This book was released on 1983 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: The residual strength of the impact-damaged laminates can be predicted using an analytical model. Both the power law and the wearout models appear to be useful in predicting the fatigue life of the composite laminates. However, because of the slope parameter, the wearout model appears to have a slight edge over the power law model, particularly at low fatigue life and higher applied stress. The strength degradation due to cyclic loading in notched laminates was found to be extremely small up to a million cycles. The residual strength of the fatigue-damaged laminates was found to increase (in proportion to the applied maximum stress with R = 0.1) after a million fatigue cycles. Impact loading followed by cyclic loading was found to be more damaging (in reducing the life of the laminate) than the reversed sequence of loading. The magnitude of the minimum projectile velocity causing catastrophic failure in the laminates tested was found as a function of the applied stress and the number of fatigue cycles.
Author : Janardhan Rao Vala
Publisher :
ISBN 13 :
Total Pages : 222 pages
Book Rating : 4.:/5 (992 download)
Download or read book Fatigue and Impact Studies on Graphite/epoxy Composite Specimens written by Janardhan Rao Vala and published by . This book was released on 1983 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 78 pages
Book Rating : 4.:/5 (317 download)
Download or read book Notched and Unnotched Fatigue Behavior of Angle-ply Graphite/epoxy Composites written by and published by . This book was released on 1976 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : E. Alschweig
Publisher :
ISBN 13 :
Total Pages : 17 pages
Book Rating : 4.:/5 (125 download)
Download or read book Fatigue Properties of Unnotched, Notched, and Jointed Specimens of a Graphite/Epoxy Composite written by E. Alschweig and published by . This book was released on 1981 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: Within a continuing program on high tensile graphite/epoxy composite, stress-strain, axial fatigue, and compliance behavior of unnotched, notched (3-mm diameter hole), and jointed specimens made of [O2/±45/O2/±45/90]s T300/914C laminates (177°C curing temperature) have been studied. In addition, the behavior of unnotched specimens cut from (1) the same laminate but with the longitudinal specimen axis now perpendicular to the zero-degree fiber direction, and (2) the high modulus fiber laminate with the same build-up was investigated.
Author : K. L. Reifsnider
Publisher : ASTM International
ISBN 13 : 9780803103474
Total Pages : 294 pages
Book Rating : 4.1/5 (34 download)
Download or read book Fatigue of Filamentary Composite Materials written by K. L. Reifsnider and published by ASTM International. This book was released on 1977 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : V. Sarma Avva
Publisher :
ISBN 13 :
Total Pages : 160 pages
Book Rating : 4.3/5 (91 download)
Download or read book Fatigue/impact Studies in Laminated Composites written by V. Sarma Avva and published by . This book was released on 1983 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: The residual strength of the impact-damaged laminates can be predicted using an analytical model. Both the power law and the wearout models appear to be useful in predicting the fatigue life of the composite laminates. However, because of the slope parameter, the wearout model appears to have a slight edge over the power law model, particularly at low fatigue life and higher applied stress. The strength degradation due to cyclic loading in notched laminates was found to be extremely small up to a million cycles. The residual strength of the fatigue-damaged laminates was found to increase (in proportion to the applied maximum stress with R = 0.1) after a million fatigue cycles. Impact loading followed by cyclic loading was found to be more damaging (in reducing the life of the laminate) than the reversed sequence of loading. The magnitude of the minimum projectile velocity causing catastrophic failure in the laminates tested was found as a function of the applied stress and the number of fatigue cycles.
Author : C. Moura Branco
Publisher : Springer Science & Business Media
ISBN 13 : 9400922779
Total Pages : 982 pages
Book Rating : 4.4/5 (9 download)
Download or read book Advances in Fatigue Science and Technology written by C. Moura Branco and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 982 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains the edited version of lectures and selected research contributions presented at the NATO ADVANCED STUDY INSTITUTE on ADVANCES IN FATIGUE SCIENCE AND TECHNOLOGY. held in Alvor. Portugal, 4th to 15th of April 1988. and organized by CEMUL - Center of Mechanics and Materials of The Technical University of Lisbon. The Institute was attended by 101 participants, including 15 lecturers. from 14 countries. The participants were leading scientists and engineers from universities, research institutions and industry. and also Ph.D~ students. Some participants presented papers during the Institute reporting the state-of-art of their research projects. All the sessions wel'e very active and quite extensive discussions on scientific aspects took place during the Institute. The Advanced Study Institute provided a forum for interaction among eminent scientists and engineers. from different schools of thought and young researchers. The Institute addressed the foundations and current state of the art of essential aspects related to fatigue science and technology, namely: Short Cracks, Metallurgical Aspects, Environmental Fatigue, Threshold Behaviour, Notch Behaviour. Creep and Fatigue Interactions at High Temperature, Multiaxial Fatigue, Low Cycle Fatigue, Methodology of Fatigue Testing, Variable Amplitude Fatigue, Fatigue of Advanced Materials. Elastic-Plastic Fatigue, and several engineering applications such as welded joints, energy systems, offshore structures, automotive industry, machine and engine components. This book is organized in three parts: Part I: Fundamentals of Fatigue Part II: Engineering Applications Part III: Research Contributions The research contributions covered most of the areas referred above.
Author :
Publisher :
ISBN 13 :
Total Pages : 994 pages
Book Rating : 4.X/5 (4 download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on with total page 994 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Marvin B. Dow
Publisher :
ISBN 13 :
Total Pages : 150 pages
Book Rating : 4.:/5 (89 download)
Download or read book The ACEE Program and Basic Composites Research at Langley Research Center (1975 to 1986) written by Marvin B. Dow and published by . This book was released on 1987 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Yasumasa Hamaguchi
Publisher :
ISBN 13 :
Total Pages : 14 pages
Book Rating : 4.:/5 (756 download)
Download or read book Fatigue life distributions of notched graphite/epoxy composite specimens written by Yasumasa Hamaguchi and published by . This book was released on 1981 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : VS. Avva
Publisher :
ISBN 13 :
Total Pages : 11 pages
Book Rating : 4.:/5 (125 download)
Download or read book Effect of Impact and Fatigue Loads on the Strength of Graphite/Epoxy Composites written by VS. Avva and published by . This book was released on 1986 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: An extensive experimental investigation on a graphite/epoxy (T300/934) composite laminate having an orientation and a stacking sequence of (±45,0,90)2s was conducted to study the behavior of the composite material subjected to several combinations of low-velocity projectile impact and tension-tension fatigue loads. The sequence of loading (impact/cycle or cycle/impact) was changed to study its effect on the strength or the life of the composite materials. The experimental data in impact tests were compared with the corresponding results obtained by using a theoretical model.
Author : C. Soutis
Publisher : iSmithers Rapra Publishing
ISBN 13 : 9781859571064
Total Pages : 140 pages
Book Rating : 4.5/5 (71 download)
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.
Author :
Publisher :
ISBN 13 :
Total Pages : 1142 pages
Book Rating : 4.E/5 ( download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1988 with total page 1142 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : JT. Ryder
Publisher :
ISBN 13 :
Total Pages : 24 pages
Book Rating : 4.:/5 (125 download)
Download or read book Effect of Compression on Fatigue Properties of a Quasi-Isotropic Graphite/Epoxy Composite written by JT. Ryder and published by . This book was released on 1977 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effect of compressive loading on the fatigue properties of a quasi-isotropic graphite/epoxy composite is discussed. Tests were conducted using parallel-sided, unnotched T300/934 graphite/epoxy coupons cured at 177°C (350°F). Results are based on a large sample size (number of coupons tested at a particular test condition) which allowed a statistically significant evaluation of data scatter. All tests were conducted at room temperature. Fatigue tests were conducted at 10 Hz under constant-amplitude loading. Static tensile and compressive properties were obtained for coupons without prior fatigue damage. Tension-tension and tension-compression fatigue stress-life curves were qualitatively evaluated using a small sample set at each stress level. Three specific stress levels were chosen and the extent of data scatter defined for each type of fatigue loading. Additional coupons were subjected to the same amount of fatigue damage and half were tested for tensile residual strength degradation and half for compressive. Such residual strength tests were conducted at the same two fatigue maximum stress levels for both tension-tension and tension-compression fatigue. Data scatter was larger for static compression tests than for static tension tests. Static and fatigue failure modes were dissimilar. Compressive load excursions reduced fatigue life especially at lower stress levels. At stress levels where fatigue failures occurred, degradation in residual strength due to fatigue also occurred. Data analysis was performed using three-parameter Weibull asymptotic fits, which proved to be superior in predicting failure rates than two-parameter fits. The effect of sample size on descriptions of data scatter and accuracy of extrapolation is discussed.
Author : Claudia Ute Ranniger
Publisher :
ISBN 13 :
Total Pages : 388 pages
Book Rating : 4.:/5 (261 download)
Download or read book Damage Tolerance and Arrest Characteristics of Pressurized Graphite/epoxy Tape Cylinders written by Claudia Ute Ranniger and published by . This book was released on 1991 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt: An investigation of the damage tolerance and arrest characteristics of internally-pressurized graphite/epoxy tape cylinders with axial notches was conducted. The extension of an existing failure prediction methodology, developed for quasi-isotropic graphite/epoxy fabric cylinders, to quasi-isotropic and structurally anisotropic tape cylinders was investigated. The effect of external circumferential stiffening bands on the direction of fracture path propagation in structurally anisotropic tape cylinders was also examined. Quasi-isotropic [90/0/±45]s and structurally anisotropic [±45/0]s and [±45/90]s coupons and cylinders were constructed from AS4/3501-6 graphite/epoxy tape. Notched and unnotched coupons were tested in tension to determine the laminate properties. The Mar-Lin equation was used to correlate the fracture stresses of the transversely-slit coupons. Isotropic and specially orthotropic cylinder failure pressure predictions were formulated by applying geometry-dependent stress intensification factors to the coupon stress correlations. Graphite/epoxy cylinders 305 mm in diameter were slit axially and pressurized to failure under two-to-one biaxial loading. Experimental failure pressures of the [90/0/±45]s cylinders agreed with predicted values for all but the specimen with the smallest slit. However, the fracture mode of the cylinder with the 12.7 mm slit indicates that delamination and axial splitting of the 0° ply around the slit may mitigate stresses at the notch tip, resulting in a higher than expected failure load. Failure pressures of structurally anisotropic cylinders were above the values found by isotropic and specially orthotropic shell predictions, and failure pressures for cylinders with 12.7 mm slits were higher than comparable coupon data as well. Possible factors neglected by the predictive methodology include structural coupling in the laminates and axial loading of the cylindrical specimens. Furthermore, applicability of the predictive methodology depends on similarity of initial fracture modes in coupons and cylinders of the same laminate type. Examination of specimen damage indicates that cylinder fracture modes are different from coupon fracture modes in all structurally anisotropic specimens and in the quasiisotropic tape cylinder with the 12.7 mm slit. Comparison of [±45/0]s and [±45/90]s cylinders with and without stiffening bands shows that stiffeners redirect fracture propagation to the circumferential direction, and can contain damage in the center section of the cylinder away from the endcaps. A quantitative assessment of stiffener effectiveness in containing fracture, based on cylinder radius, slit size, and bending stiffnesses of the laminates is proposed.
Author :
Publisher :
ISBN 13 :
Total Pages : 702 pages
Book Rating : 4.:/5 (31 download)
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1988 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:
