Download or read book Fatigue Behavior of Metal Laminates written by Joseph F. Throop and published by . This book was released on 1973 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main purpose of this investigation was to study the effects of the interfaces in metallic laminates upon fatigue crack propagation and fracture resistance in order to exploit any crack retardation effects and to enable the prevention of crack acceleration effects. This is the report of exploratory experimental studies of the behavior of AISI 1018 steel laminates and 6061-T6 structural aluminum alloy laminates using 1-inch thick ASTM compact specimens (1) for fatigue crack growth and fracture tests. This study is concerned with the fatigue damage tolerance and fracture resistance in bonded metal laminates.
Download or read book Modeling of Fatigue Behavior and Damage Tolerance durability in Fiber Metal Laminates written by Po-Yu Chang and published by . This book was released on 2008 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this dissertation, it is intended to research on these areas to have a thorough and complete understanding of Glare laminates in fatigue behavior and ability to damage tolerance and durability.
Download or read book Fatigue and Fracture of Fibre Metal Laminates written by René Alderliesten and published by Springer. This book was released on 2017-04-19 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contributes to the field of hybrid technology, describing the current state of knowledge concerning the hybrid material concept of laminated metallic and composite sheets for primary aeronautical structural applications. It is the only book to date on fatigue and fracture of fibre metal laminates (FMLs). The first section of the book provides a general background of the FML technology, highlighting the major FML types developed and studied over the past decades in conjunction with an overview of industrial developments based on filed patents. In turn, the second section discusses the mechanical response to quasi-static loading, together with the fracture phenomena during quasi-static and cyclic loading. To consider the durability aspects related to strength justification and certification of primary aircraft structures, the third section discusses thermal aspects related to FMLs and their mechanical response to various environmental and acoustic conditions.
Download or read book Fatigue of Composite Materials written by K.L. Reifsnider and published by Elsevier. This book was released on 2012-12-02 with total page 532 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides the first comprehensive review of its kind on the long-term behaviour of composite materials and structures subjected to time variable mechanical, thermal, and chemical influences, a subject of critical importance to the design, development, and certification of high performance engineering structures. Specific topics examined include damage, damage characterization, and damage mechanics; fatigue testing and evaluation; fatigue behaviour of short and long fibre reinforced polymer and metal matrix materials; viscoelastic and moisture effects; delamination; statistical considerations; the modeling of cumulative damage development; and life prediction. The volume provides an extensive presentation of data, discussions, and comparisons on the behaviour of the major types of material systems in current use, as well as extensive analysis and modeling (including the first presentation of work not found elsewhere). The book will be of special interest to engineers concerned with reliability, maintainability, safety, certification, and damage tolerance; to materials developers concerned with making materials for long-term service, especially under severe loads and environments, and to lecturers, students, and researchers involved in material system design, performance, solid mechanics, fatigue, durability, and composite materials. The scope of the work extends from entry level material to the frontiers of the subject.
Download or read book Fatigue Crack Propagation and Delamination Growth in Glare written by R. Alderliesten and published by Delft University Press. This book was released on 2005-01-01 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fibre Metal Laminates written by Ad Vlot and published by Springer Science & Business Media. This book was released on 2001-09-30 with total page 556 pages. Available in PDF, EPUB and Kindle. Book excerpt: Like New, No Highlights,No Markup,all pages are intact.
Download or read book Fatigue Behavior and Damage Accumulation of Fiber Reinforced Plastic Laminates and Joints written by and published by . This book was released on 1997 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aspects of fatigue damage in various fiber reinforced plastic (FRP) laminates are discussed. Different S-N curves (stress level versus number of cycles to failure) for composite fatigue modeling are presented. Cumulative damage theories applicable to composite materials are investigated. Results of an experimental program in constant and random amplitude fatigue of FRP laminates and joints are presented. Constant amplitude fatigue test results of the FRP laminates indicate a fairly good fit to the traditional power law S-N curve model for cross-ply laminates. In contrast, constant amplitude fatigue tests of angle-ply laminates and bonded, bolted, and bonded bolted joints exhibit significantly less favorable fit to the power law model. Random amplitude fatigue tests show an inconsistent trend as compared to predictions made using Rayleigh approximation. Fatigue life prediction of the laminate specimens tend to be non-conservative for low RMS levels and conservative for high RMS values. The opposite behavior is observed for the joint specimens, where conservative fatigue life estimates are obtained for low RMS levels and non-conservative estimates for high RMS levels.
Download or read book Fatigue Behavior and Damage Accumulation of Fiber Reinforced Plastic Laminates and Joints written by G. Michaelov and published by . This book was released on 1997-09-01 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aspects of fatigue damage in various fiber reinforced plastic (FRP) laminates are discussed. Different S-N curves (stress level versus number of cycles to failure) for composite fatigue modeling are presented. Cumulative damage theories applicable to composite materials are investigated. Results of an experimental program in constant and random amplitude fatigue of FRP laminates and joints are presented. Constant amplitude fatigue test results of the FRP laminates indicate a fairly good fit to the traditional power law S-N curve model for cross-ply laminates. In contrast, constant amplitude fatigue tests of angle-ply laminates and bonded, bolted, and bonded bolted joints exhibit significantly less favorable fit to the power law model. Random amplitude fatigue tests show an inconsistent trend as compared to predictions made using Rayleigh approximation. Fatigue life prediction of the laminate specimens tend to be non-conservative for low RMS levels and conservative for high RMS values. The opposite behavior is observed for the joint specimens, where conservative fatigue life estimates are obtained for low RMS levels and non-conservative estimates for high RMS levels.
Download or read book Fracture and Fatigue Properties of Ti Al3Ti Metal intermetallic Laminate MIL Composites written by Raghavendra R. Adharapurapu and published by . This book was released on 2003 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Post impact Fatigue Behavior of Composite Laminates written by Alkis Paipetis and published by . This book was released on 2010 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fatigue of Notched Fiber Composite Laminates Part 2 Analytical and Experimental Evaluation written by and published by . This book was released on 1976 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fatigue Behavior of Composite Laminates written by and published by . This book was released on 1980 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main objective of this program during the final reporting period was to investigate the fatigue behavior of a (02/90/ + or - 45)s AS/3501-5A Gr/ Ep laminate through proof testing. The primary emphasis was on the delineation of the effect of proof test on the residual strength and life, the establishment of strength-life relations, and the identification of sources of scatter in strength and life. The test program consisted of static tests, tension-tension fatigue tests preceded by proof tests, and examinations of failure characteristics. Major findings can be summarized as follows: (1) Proof tests have little effect on the residual strength and life; (2) A relation exists between strength and life such that a statically stronger specimen has a longer life; (3) A minimum life can be assured by a proof test; (4) A higher modulus is an indication of a higher strength and longer life; (5) What distinguishes a typical static failure mode from a typical fatigue failure mode is the lack of delamination in the former; (6) At a moderate fatigue stress, the failure mode changes from a static failure mode to a typical fatigue failure mode around 20, 000 cycles; and (7) A delamination surface consists of shiny and dull areas. The shiny area has bare fibers whereas the dull area only has fiber traces in the epoxy.
Download or read book Experimental Investigation of Fatigue Behavior of Curved Composite Laminates written by Ezgi Ustun and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In the aerospace and wind turbine industries, high demand for light weight structures with high strength extend the use of composite laminates in a wide variety of geometries as load carrying elements. However, more complex geometries as curved composite laminates experience delamination and matrix cracking due to high interlaminar stresses induced in the curved region. Moreover, under cyclic loading failure on these components initiates under lower stress states so that fatigue behavior of curved composite laminates are critical. This thesis discusses the experimental investigation of fatigue behavior of curved composite laminates under bending moment. Bending moment is obtained at the curved region by applying axial load from both tips of the curved composite laminates. A special loading fixture is designed in order to apply axial load to curved specimens in universal testing machine. Two different lay-up configurations are investigated; [0]15s unidirectional as fiber dominated and [03/903/03/903/03]s cross-plied laminates as matrix dominated. Static loading experiments are conducted in order to obtain average ultimate strength of materials to use in fatigue loading experiments and compare the damage pattern with the fatigue failure. The load-displacement curves are recorded for both static and fatigue loading cases. The failure is observed using high speed camera under static loading. DSLR camera images and micrographs are taken for both static and fatigue experiments. Under static loading, two load drop is observed for [0] UD laminates until failure. Under fatigue loading, [0] UD laminates experience one sharp load drop, then stiffness degrades gradually until failure. The failure pattern of [0] UD laminates under static and fatigue loading is completely different. Cross-plied laminates show similar behavior on load-displacement curves and failure mechanisms under static and fatigue loading. Under static and fatigue loading, unexpected failure mechanisms are observed for cross-plied laminates which are found to be sensitive to the manufacturing defects.
Download or read book Fatigue of Materials at Very High Numbers of Loading Cycles written by Hans-Jürgen Christ and published by Springer. This book was released on 2018-11-19 with total page 628 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book represents the final reports of the scientific projects funded within the DFG-SPP1466 and, hence, provides the reader with the possibility to familiarize with the leading edge of VHCF research. It draws a balance on the existing knowledge and its enhancement by the joint research action of the priority program. Three different material classes are dealt with: structural metallic materials, long-fiber-reinforced polymers and materials used in micro-electro-mechanical systems. The project topics address the development of suitable experimental techniques for high-frequency testing and damage monitoring, the characterization of damage mechanisms and damage evolution, the development of mechanism-based models and the transfer of the obtained knowledge and understanding into engineering regulations and applications.
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.
Download or read book Fatigue Prediction of Lightweight Thermoplastic Fiber Metal Laminates written by H. Kang and published by . This book was released on 2006 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lightweight thermoplastic-based fiber-metal laminates were developed based on a self-reinforced polypropylene and a glass fiber-reinforced polypropylene composite material with two sheets of aluminum alloy 2024-T3. The laminates were manufactured using a fast one step cold press manufacturing procedure. The mechanical behavior of the laminates was then investigated under tensile and fatigue loading conditions. The tensile properties of the plain aluminum, the composite materials, and the thermoplastic fiber-metal laminates (TFML) were investigated at quasi-static rates of loading. The fatigue tests were also conducted under load control based on the ASTM E 466 standard procedure. Various loading cycles were employed for the fatigue tests in order to minimize the possibility of heat generation on the composite materials. Three different load levels were applied for the fatigue specimens with zero to max loading. Results have shown that the glass fiber-reinforced polypropylene hybrid systems exhibited higher fatigue strength than the self-reinforced polypropylene based fiber-metal laminates. Following this, a simple prediction method for fatigue life of the TFMLs has been introduced. It is clearly indicated that the stress ranges calculated using the proposed method for the monolithic AL2024-T3 and the TFMLs are very similar at the same cycles to failure.
Download or read book Long Term Fatigue Behavior of Composite Materials written by JC. Duke and published by . This book was released on 1983 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: There is now a significant body of literature that provides a fairly detailed account of the types of damage that commonly develop during the tensile and compressive fatigue loading of high-modulus fibrous composite laminates. Although this body of information is by no means complete, many detailed descriptions of microevents that accompany such loadings are available, and some models have been developed, including successful attempts to represent and predict the stiffness changes which accompany certain types of damage. However, at least two basic and essential questions concerning such fatigue response remain unanswered. First, exactly how does damage reduce laminate strength during long-term fatigue loading? And, second, how does damage (during a long-term fatigue test) combine to cause the fracture event which defines the life of a laminate? The present paper addresses these two questions. Laminates of several types and materials were loaded in cyclic tension or compression at load levels which corresponded to long times to failure. At these "high cycle" levels, the reduction in residual strength was maximized. The corresponding damage states were monitored using an array of nondestructive and destructive techniques. Special attention was given to the damage states that developed just prior to failure. Various concepts and models were applied to the interpretation of the data. Damage development in tension and compression was contrasted.
