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Fatigue Damage Mechanisms In Advanced Hybrid Titanium Composite Laminates
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Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721280735 Total Pages :24 pages Book Rating :4.2/5 (87 download)
Book Synopsis Fatigue Damage Mechanisms in Advanced Hybrid Titanium Composite Laminates by : National Aeronautics and Space Administration (NASA)
Download or read book Fatigue Damage Mechanisms in Advanced Hybrid Titanium Composite Laminates written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-19 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hybrid Titanium Composite Laminates (HTCL) are a type of hybrid composite laminate with promise for high-speed aerospace applications, specifically designed for improved damage tolerance and strength at high-temperature (350 F, 177 C). However, in previous testing, HTCL demonstrated a propensity to excessive delamination at the titanium/PMC interface following titanium cracking. An advanced HTCL has been constructed with an emphasis on strengthening this interface, combining a PETI-5/IM7 PMC with Ti-15-3 foils prepared with an alkaline-perborate surface treatment. This paper discusses how the fatigue capabilities of the "advanced" HTCL compare to the first generation HTCL which was not modified for interface optimization, in both tension-tension (R = 0.1) and tension-compression (R=-0.2). The advanced HTCL under did not demonstrate a significant improvement in fatigue life, in either tension-tension or tension-compression loading. However, the advanced HTCL proved much more damage tolerant. The R = 0.1 tests revealed the advanced HTCL to increase the fatigue life following initial titanium ply damage up to 10X that of the initial HTCL at certain stress levels. The damage progression following the initial ply damage demonstrated the effect of the strengthened PMC/titanium interface. Acetate film replication of the advanced HTCL edges showed a propensity for some fibers in the adjacent PMC layers to fail at the point of titanium crack formation, suppressing delamination at the Ti/PMC interface. The inspection of failure surfaces validated these findings, revealing PMC fibers bonded to the majority of the titanium surfaces. Tension compression fatigue (R = -0.2) demonstrated the same trends in cycles between initial damage and failure, damage progression, and failure surfaces. Moreover, in possessing a higher resistance to delamination, the advanced HTCL did not exhibit buckling following initial titanium ply cracking under compression unlike the initial HTCL
Book Synopsis Fatigue Damage Mechanisms of Advanced Hybrid Titanium Composite Laminates by : Donald William Rhymer
Download or read book Fatigue Damage Mechanisms of Advanced Hybrid Titanium Composite Laminates written by Donald William Rhymer and published by . This book was released on 1999 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis American Society of Composites, Fourteenth International Conference Proceedings by : Amer Society Composi
Download or read book American Society of Composites, Fourteenth International Conference Proceedings written by Amer Society Composi and published by CRC Press. This book was released on 1999-10-25 with total page 1030 pages. Available in PDF, EPUB and Kindle. Book excerpt: Conference proceedings of the Fourteenth American Society for Composites held on the September 27-29 1999 at the Holiday Inn-1675 Conference Centre, Fairborn, Ohio.
Book Synopsis Proceedings of the American Society for Composites, Seventeenth Technical Conference by : C. T. Sun
Download or read book Proceedings of the American Society for Composites, Seventeenth Technical Conference written by C. T. Sun and published by CRC Press. This book was released on 2002-10-24 with total page 1685 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Hybrid Polymer Composite Materials: Structure and Chemistry by : Vijay Kumar Thakur
Download or read book Hybrid Polymer Composite Materials: Structure and Chemistry written by Vijay Kumar Thakur and published by Woodhead Publishing. This book was released on 2017-06-03 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hybrid Polymer Composite Materials: Volume 1: Structure and Chemistry presents the latest on these composite materials that can best be described as materials that are comprised of synthetic polymers and biological/inorganic/organic derived constituents. The combination of unique properties that emerge as a consequence of the particular arrangement and interactions between the different constituents provides immense opportunities for advanced material technologies. This series of four volumes brings an interdisciplinary effort to accomplish a more detailed understanding of the interplay between synthesis, structure, characterization, processing, applications, and performance of these advanced materials, with this volume focusing on their structure and chemistry. Provides a clear understanding of the present state-of-the-art and the growing utility of hybrid polymer composite materials Includes contributions from world renowned experts and discusses the combination of different kinds of materials procured from diverse resources Discusses their synthesis, chemistry, processing, fundamental properties, and applications Provides insights on the potential of hybrid polymer composite materials for advanced applications
Book Synopsis Characterization of Mechanical and Fatigue Properties for a Hybrid Titanium Composite Laminate by : Edward Li
Download or read book Characterization of Mechanical and Fatigue Properties for a Hybrid Titanium Composite Laminate written by Edward Li and published by . This book was released on 1997 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Mechanics of Fatigue Damage in Titanium-graphite Hybrid Laminates by : Dennis Arthur Burianek
Download or read book Mechanics of Fatigue Damage in Titanium-graphite Hybrid Laminates written by Dennis Arthur Burianek and published by . This book was released on 2001 with total page 219 pages. Available in PDF, EPUB and Kindle. Book excerpt: Titanium-graphite hybrid laminates are being developed for high-temperature aerospace applications. Experimental observations have indicated that cracks in the titanium facesheets initiate at free edges as well as in areas of high stress concentration, such as holes and notches and that a delaminated region between the facesheet and the intact plies develops and propagates in the wake of the facesheet crack. This thesis experimentally and analytically evaluates the facesheet crack and delamination growth behavior of TiGr laminates. The delamination growth behavior is studied by isolating delamination growth using TiGr specimens with facesheet seams. The growth rate of delamination from facesheet seams is related via a power law to the applied strain energy release rate. It is shown that elevated temperatures significantly increase the growth rate of facesheet delamination. The facesheet crack growth behavior in TiGr laminates was measured experimentally and compared to model predictions. It is shown that the crack growth rate in TiGr facesheets is significantly lower for TiGr laminates as compared to monolithic titanium. After an initial decrease in crack growth rate, the crack propagates at a constant rate while the crack growth rate for monolithic titanium increases as the crack extends. A three-dimensional finite element model was implemented that captured the experimental crack growth trends without any additional tuning parameters. A global, bridged-crack model was not accurate in predicting the facesheet crack growth behavior of TiGr laminates. The bridged-crack model failed because it did not capture the details of the bridging stresses and delamination in the vicinity of the crack tip. In contrast to the delamination growth from facesheet seams, it was shown that elevated temperatures did not significantly affect the growth rate of the titanium facesheet crack. Future efforts to model composite damage growth using global modeling approach must validate the model to ensure that all of the necessary parameters are captured.
Book Synopsis Fatigue Damage Growth Mechanisms in Continuous Fiber Reinforced Titanium Matrix Composites by :
Download or read book Fatigue Damage Growth Mechanisms in Continuous Fiber Reinforced Titanium Matrix Composites written by and published by . This book was released on 1990 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fatigue Damage-strength Relationships in Composite Laminates. Volume 1 by : Kenneth L. Reifsnider
Download or read book Fatigue Damage-strength Relationships in Composite Laminates. Volume 1 written by Kenneth L. Reifsnider and published by . This book was released on 1983 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report is Vol. I of a 2-part final report on the activities which were conducted under Contract No. F33615-81-3225. The general objective of this program was to investigate the precise nature of the damage events caused by cyclic (fatigue) loading of composite laminates that are directly related to fracture of those laminates, to develop a conceptual understanding of how those damage events reduce the residual strength of the laminates, and to determine how the collective damage condition following long-term cyclic loading precipitates the final fracture event. The program was conducted in four phases: (1) the development of fatigue damage during long-term cyclic loading was investigated in such a way that the damage events which occur quite late in the fatigue life of the material, just prior to fracture, were identified and characterized; (2) the special contribution and nature of fiber fracture was investigated; (3) the nature of the collective damage condition which precipitates the fracture event under long-term fatigue loading was investigated; (4) a philosophy of fracture in composite laminates following severe damage development due to cyclic loading was developed. A wide variety of destructive and nondestructive experimental evaluation schemes were used in the program, and several analytical efforts were conducted to support the experimental activities.
Book Synopsis Geopolymer, Green Chemistry and Sustainable Development Solutions by : Joseph Davidovits
Download or read book Geopolymer, Green Chemistry and Sustainable Development Solutions written by Joseph Davidovits and published by Geopolymer Institute. This book was released on 2005 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fatigue Damage in Titanium Graphite Hybrid Laminates by : Dennis Arthur Burianek
Download or read book Fatigue Damage in Titanium Graphite Hybrid Laminates written by Dennis Arthur Burianek and published by . This book was released on 1998 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hybrid laminates could become an enabling technology for future high-temperature, low mass fraction aerospace vehicles. However, since they are a relatively new material technology, research needs to be conducted to characterize the key damage modes to guide material development and structural design. In this research program, high temperature, tension-compression fatigue tests were performed on TiGr laminates. Fatigue life data were collected for specimens at several percentages of open hole tension strength. A series of specimens were tested and analyzed using cross-sectioning and microscopy to quantify the damage progression sequence in the laminates. Stiffness measurements were taken during fatigue cycling and were correlated with damage state and residual strength after cycling. The key damage modes were identified as ply splitting, facesheet cracking and facesheet delamination. A comparison was made between the ply splits in TiGr and similar splitting observed in 00/900 cross-ply PMC laminates which showed that the growth rate of the splits was similar to that of splits in non-hybrid PMC laminates. The titanium facesheet cracking was consistent with the applied stress levels and the fatigue behavior of monolithic titanium. Delamination is the dominant damage mode for stiffness reduction. Extensive delamination is consistent with the high strain energy release rate between the facesheet and the core. This work provides insight as to the key damage modes and factors controlling the progression and provides recommendations for critical areas for future investigation and material development.
Book Synopsis An Investigation Into the Fatigue of a Hybrid Titanium Composite Laminate by : WS. Johnson
Download or read book An Investigation Into the Fatigue of a Hybrid Titanium Composite Laminate written by WS. Johnson and published by . This book was released on 2006 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 such as ARALL and GLARE while extending their applications to elevated temperatures. Titanium layers are bonded by prepreg layers of high-temperature resin reinforced with carbon fibers. The constituent materials used in this study are a metastable ß titanium alloy (Ti-15-3), a high-temperature polyimide (LARCTM-IAX), and an intermediate modulus carbon fiber (IM7). This study includes quasi-static and fatigue testing of HTCL materials at room temperature and 177°C (350°F). Experimental stress-strain response of HTCL laminates are compared with predicted results by a laminate analysis code called AGLPLY. A stress-based fatigue study was performed to determine the fatigue properties of HTCL laminates. The roles of residual stress in the mechanical behavior and fatigue properties of HTCL are addressed. The development of damage in HTCL specimens during fatigue is shown to include titanium ply cracking, interfacial debonding, and PMC layer failure. The influence of the fatigue properties of titanium layers on the fatigue of HTCL is discussed. The performance of HTCL laminates in fatigue is shown superior to that of the monolithic titanium alloy for room-temperature and elevated-temperature conditions.
Book Synopsis Proceedings of the American Society for Composites ... Technical Conference by :
Download or read book Proceedings of the American Society for Composites ... Technical Conference written by and published by . This book was released on 1999 with total page 1032 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Interacting Damage Modes in Titanium-graphite Hybrid Laminates by : Dennis Arthur Burianek
Download or read book Interacting Damage Modes in Titanium-graphite Hybrid Laminates written by Dennis Arthur Burianek and published by . This book was released on 2001 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental and analytical investigation was conducted of the growth under cyclic loading of face-sheet cracks coupled with delaminations in Titanium-graphite hybrid laminates. A 3-D finite element model was developed to obtain the stress-intensity factor for the titanium face-sheet crack as a function of the material properties, ply thicknesses, specimen geometry and delamination shape. The results for the stress-intensity factor were compared to a 2-D finite element model and a cohesive zone/bridged crack model. Significant differences were identified indicating that for this problem it is essential to use a full 3-D analysis. The model was applied to experimental data for three laminates (Ti/0/90/02)s, (Ti/90/0/90 2 ) 2 and (Ti/0/90/30)s. An independently-calibrated Paris Law was used to describe the fatigue crack growth behavior of the face-sheets. A good description of the experimental data was obtained for the first two laminates, with a slightly less-good description for the third. This poorer fit was attributed to the presence of additional damage modes in the laminate containing 30' plies. In all cases the face-sheet cracks were found to asymptote to a steady state (crack length-independent) growth regime, which was predicted by the 3-D finite element model. Crack opening displacement profiles measured experimentally were compared with those predicted by the finite element model. Good agreement was demonstrated, indicating that the FE model correctly modeled the load transfer mechanisms around the crack.
Book Synopsis Proceedings of the ASME Materials Division by :
Download or read book Proceedings of the ASME Materials Division written by and published by . This book was released on 2005 with total page 620 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Recent Developments in Durability Analysis of Composite Systems by : H. Dardon
Download or read book Recent Developments in Durability Analysis of Composite Systems written by H. Dardon and published by CRC Press. This book was released on 2022-01-26 with total page 493 pages. Available in PDF, EPUB and Kindle. Book excerpt: The papers from these proceedings address experimental and analytical methods for the characterization and analysis of modern composite and adhesive systems. They have been produced to provide understanding that can be used to design safe, reliable engineering components.
Book Synopsis Fatigue Induced Delamination in Titanium-graphite Hybrid Laminates by : Simon Mark Spearing
Download or read book Fatigue Induced Delamination in Titanium-graphite Hybrid Laminates written by Simon Mark Spearing and published by . This book was released on 1998 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: Titanium-graphite hybrid laminates (TiGr) could become an enabling technology for future aerospace vehicles (requiring high operating temperatures and low mass fractions). However, since they are a relatively new material technology, the key damage modes need to be characterized and studied in order to guide material development and structural design. Previous work has identified delamination of the metal layers from the composite plies as a key damage mode. In this paper, results are presented for high temperature (177° C), tension-tension fatigue tests performed on [Ti/0/90/02]s TiGr laminates containing horizontal facesheet seams. Horizontal seams in the titanium facesheets are a likely origination point for delamination. Delamination growth rates were monitored by intermittent direct observation and continuous stiffness monitoring. The cyclic delamination growth rate was found to follow a power law relationship with the applied strain energy release rate, with an exponent of 2. This work provides insight into the delamination growth behavior and provides an empirical starting point for finite element models of delamination growth.
