Download or read book Micromechanics of Crack Extension in Aluminium Alloys written by Agah Uguz and published by . This book was released on 1990 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fracture Mechanics written by Fazil Erdogan and published by ASTM International. This book was released on 1995 with total page 716 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Micromechanisms of Crack Extension in Aluminium Alloys written by Agah Uḡuz and published by . This book was released on 1990 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fracture Mechanics written by Walter G. Reuter and published by ASTM International. This book was released on 1995 with total page 842 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Micromechanisms of Crack Extension in Alloys written by John A. Blind and published by . This book was released on 1982 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work describes an investigation of the effect of manganese-bearing dispersoid particles on the fracture characteristics of peak aged Al-Mg-Si alloys. Current elastic and elastic-plastic fracture toughness parameters are reviewed. The applicability of these parameters as criteria for the onset of crack extension and their variation with alloy microstructure are examined based on experimental results for a series of alloys containing differing volume fractions of disperoid. High purity alloys were used to isolate the effect of dispersoids from that of coarse constituent particles. Also, for comparison, one alloy of commercial purity containing both disperoids and coarse iron-bearing inclusions was studied. The ductile fracture toughness, JIc, and the resistance to instability as measured by the tearing modulus, T, were found to increase with disperoid content. The values of these parameters were lower in the commercial purity alloy than for the equivalent high purity alloy. The effect of an increasingly triaxial state on fracture strain was measured using a series of notched tensile specimens. The alloy ductility was found to increase with disperoid content and to decrease with increased stress triaxiality. Crack tip plastic zone sizes on the midplane of compact tension specimens were measured using the SEM electron channelling pattern technique. Zone size was found to correlate with the square of the applied stress intensity factor. The constant of proportionality decreased with increasing disperoid content. The calculated work per unit area of new crack surface was found to correspond to the ductile fracture toughness measured for each alloy.
Download or read book Micromechanics of Hydrogen Embrittlement of Aluminum Alloys written by Leonel Stermann and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hydrogen embrittlement of structural metallic alloys is an economic and safety concern in many traditional industries and, looking forward, to the energetic transition. However; this phenomenon is still not fully understood. Microstructure scale studies are crucial to elucidate the role of plasticity in the fracture process. The strategy consists in reducing the size of the experimental set up by using a micro tensile machine to observe crack propagation at sub-grain scale in an AlZnMg commercial alloy. Internal hydrogen embrittlement (IHE) and stress corrosion cracking (SCC) tests are performed on notched samples. Single crack propagation is followed by optical microscopy. Digital image correlation (DIC) is used to measure the surface displacement and strain field and determine the crack tip position with a resolution of one micron. Crack propagation velocities and applied stress intensity factor values are obtained. In both IHE and SCC, two different kinds of plastic deformation are observed accompanying the crack propagation. They are finely quantified by DIC. The first kind has the shape of two deformation bands, inclined with respect to the fracture plane, emitted from the crack tip. The second one is an intense deformation just ahead of the crack tip with only a few microns extension. Scanning Electron Microscope examinations of the fracture surface are used to find connections between fracture morphology, local crack speed, and local plasticity intensity at a microscopic scale.
Download or read book Prediction of Stable Tearing of 2024 T3 Aluminum Alloy Using the Crack tip Opening Angle Approach written by and published by . This book was released on 1993 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fatigue and Fracture Mechanics written by Kenneth L. Jerina and published by ASTM International. This book was released on 2000 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fracture and Fatigue written by Lawrence J. Broutman and published by Elsevier. This book was released on 2016-06-15 with total page 485 pages. Available in PDF, EPUB and Kindle. Book excerpt: Composite Materials, Volume 5: Fracture and Fatigue covers the concepts, theories, and experiments on fracture and fatigue behavior of composite materials. The book discusses the fracture of particulate composites, including metal, polymer, and ceramic matrices; relates micromechanics effects to composite strength; and summarizes the various theories relating constituent properties and microstructure to fracture. The text also describes differing theories regarding the strength and fracture of composites; and the theory and experiment relating to time-dependent fracture covering both long-term as well as dynamic fracture. The fatigue of both polymer- and metal-matrix composites and the factors influencing the toughness of both brittle and ductile matrix composites are also considered. Design engineers, materials scientist, materials engineers, and metallurgists will find the book useful.
Download or read book Fracture Mechanics and Surface Chemistry Studies of Fatigue Crack Growth in an Aluminum Alloy written by R. P. Wei and published by . This book was released on 1979 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fracture mechanics and surface chemistry studies were carried out to develop further understanding of the influence of water vapor on fatigue crack growth in aluminum alloys. The room temperature fatigue crack growth response was determined for 2219-T851 aluminum alloy exposed to water vapor at presures from 1 Pa to 30 Pa over a range of stress intensity factors (K). Data were also obtained in vacuum and dehumidified argon. The test results showed that, at a frequency of 5 Hz, the rate of crack growth is essentially unaffected by water vapor until a threshold pressure is reached. Above this threshold, the rates increased, reaching a maximum within one order of magnitude increase in vapor pressure. (Author).
Download or read book Prediction of Stable Tearing of 2024 T3 Aluminum Alloy Using the Crack Tip Opening Angle Approach written by National Aeronautics and Space Adm Nasa and published by . This book was released on 2018-10-18 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this study, the crack-tip opening angle (CTOA) approach was incorporated into a damage growth finite element program, MADGIC (Micromechanics Analysis and Damage Growth in Composites), and was used to predict stable tearing in a middle-crack tension 2024-T3 aluminum alloy specimen. The MADGIC code is a displacement based finite element program implemented with an incremental elastic-plastic algorithm used to model elastic-plastic behavior and a nodal splitting and nodal force relaxation algorithm used to generate crack surfaces. Predictions of the applied stress as a function of crack extension and applied stress as a function of load-line displacement were in good agreement with experiments and with similar predictions made using an existing finite element program, ZIP2D. In addition, path integrals, namely, the J-integral and T*-integral, were also evaluated and compared with the CTOA approach. There appears to be a weak relationship between the CTOA and the T*-integral evaluated on a specific integration path during crack extension beyond maximum applied stress. This study further verifies that the CTOA can be used as an effective elastic-plastic fracture mechanics parameter to predict crack growth. Bakuckas, J. G., Jr. and Newman, J. C., Jr. Langley Research Center RTOP 538-02-10-01...
Download or read book IUTAM Symposium on Micromechanics of Plasticity and Damage of Multiphase Materials written by André Pineau and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt: The IUT AM Symposium on "Micromechanics of Plasticity and Damage of Multiphase Materials" was held in Sevres, Paris, France, 29 August - 1 September 1995. The Symposium was attended by 83 persons from 18 countries. In addition 17 young French students attended the meeting. During the 4 day meeting, a total of 55 papers were presented, including 24 papers in the poster sessions. The meeting was divided into 7 oral and 3 poster sessions. The 7 oral sessions were the following: - Plasticity and Viscoplasticity I and II; - Phase transformations; - Damage I and II; - Statistical and geometrical aspects; - Cracks and interfaces. Each poster session was introduced by a Rapporteur, as follows: - Session I (Plasticity and Viscoplasticity): G. Cailletaud; - Session 2 (Damage): D. Franc;:ois; - Session 3 (Phase transformation; statistical and geometrical aspects): D. Jeulin. The main purpose of the Symposium was the discussion of the state of the art in the development of micromechanical models used to predict the macroscopic mechanical behaviour of mUltiphase solid materials. These materials consist of at least two chemically different phases, present either initially or formed during plastic deformation, when a strain-induced phase transformation takes place. One session was devoted to the latter case. Continuously strengthened composite materials, containing long fibers, were out of the scope of the Symposium.
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1972 with total page 520 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Micromechanics written by American Society of Mechanical Engineers. Winter Annual Meeting and published by . This book was released on 1989 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fracture Mechanics Studies of Fatigue Crack Propagation in 2024 Aluminium Alloy Panels Containing Transverse Slits written by R. Ellis and published by . This book was released on 1972 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fracture Mechanics Studies of Fatique Crack Propagation in 2024 Aluminium Alloy Panels Containing Transverse Slits written by R. Ellis and published by . This book was released on 1972 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1964 with total page 834 pages. Available in PDF, EPUB and Kindle. Book excerpt:
