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Author : Ukhwan Sur
Publisher :
ISBN 13 :
Total Pages : 172 pages
Book Rating : 4.3/5 (129 download)
Download or read book A Numerical Method for the Treatment of Kinked Cracks in Finite Bodies written by Ukhwan Sur and published by . This book was released on 1987 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 300 pages
Book Rating : 4.:/5 (3 download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : J. C. Newman
Publisher :
ISBN 13 :
Total Pages : 98 pages
Book Rating : 4.F/5 ( download)
Download or read book Stress-intensity Factor Equations for Cracks in Three-dimensional Finite Bodies Subjected to Tension and Bending Loads written by J. C. Newman and published by . This book was released on 1984 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Nengquan Liu
Publisher :
ISBN 13 :
Total Pages : 404 pages
Book Rating : 4.3/5 (129 download)
Download or read book A Numerical Method for the Solution of Plane Steady-state Thermoelastic Fracture Mechanics Problems written by Nengquan Liu and published by . This book was released on 1991 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : SC. TerMaath
Publisher :
ISBN 13 :
Total Pages : 17 pages
Book Rating : 4.:/5 (125 download)
Download or read book Investigation of a New Analytical Method for Treating Kinked Cracks in a Plate written by SC. TerMaath and published by . This book was released on 2000 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new analytical method for treating kinked and branched cracks is investigated to understand its subtleties and their effects on accuracy and efficiency. Based on a weighted superposition approach, this method uses analytical functions built from opening displacement profiles to determine full stress and displacement fields in a linearly elastic two-dimensional infinite plate containing interacting kinked and branched cracks under far field loading. In addition, results include stress intensity factors at tip and kink locations. Rapid convergence is achieved for few degrees of freedom yielding crack face tractions consistent with those prescribed. Moreover, this method involves no numerical integration, eliminating unnecessary computational errors. The features of this method are demonstrated by the solution of a V-shaped crack. The method yields stress intensity factor results that are in agreement with a particular case found in a well-known handbook.
Author : D.A. Hills
Publisher : Springer Science & Business Media
ISBN 13 : 9401586489
Total Pages : 314 pages
Book Rating : 4.4/5 (15 download)
Download or read book Solution of Crack Problems written by D.A. Hills and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is concerned with the numerical solution of crack problems. The techniques to be developed are particularly appropriate when cracks are relatively short, and are growing in the neighbourhood of some stress raising feature, causing a relatively steep stress gradient. It is therefore practicable to represent the geometry in an idealised way, so that a precise solution may be obtained. This contrasts with, say, the finite element method in which the geometry is modelled exactly, but the subsequent solution is approximate, and computationally more taxing. The family of techniques presented in this book, based loosely on the pioneering work of Eshelby in the late 1950's, and developed by Erdogan, Keer, Mura and many others cited in the text, present an attractive alternative. The basic idea is to use the superposition of the stress field present in the unfiawed body, together with an unknown distribution of 'strain nuclei' (in this book, the strain nucleus employed is the dislocation), chosen so that the crack faces become traction-free. The solution used for the stress field for the nucleus is chosen so that other boundary conditions are satisfied. The technique is therefore efficient, and may be used to model the evolution of a developing crack in two or three dimensions. Solution techniques are described in some detail, and the book should be readily accessible to most engineers, whilst preserving the rigour demanded by the researcher who wishes to develop the method itself.
Author :
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ISBN 13 :
Total Pages : 876 pages
Book Rating : 4.F/5 ( download)
Download or read book Dissertation Abstracts International written by and published by . This book was released on 1997 with total page 876 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 400 pages
Book Rating : 4.3/5 (243 download)
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:
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Publisher :
ISBN 13 :
Total Pages : 56 pages
Book Rating : 4.:/5 (317 download)
Download or read book Stress-intensity Factor Equations for Cracks in Three-dimensional Finite Bodies written by and published by . This book was released on 1981 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 934 pages
Book Rating : 4.F/5 ( download)
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1999 with total page 934 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Justin Patrick Gilman
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (61 download)
Download or read book A Continuing Investigation Into the Stress Field Around Two Parallet-edge Cracks in a Finite Body written by Justin Patrick Gilman and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The goal of this research was to extend the investigation into a method to represent and analyze the stress field around two parallel edge cracks in a finite body. The Westergaard-Schwarz method combined with the local collocation method was used to analyze different cases of two parallel edge cracks in a finite body. Using this method a determination of when two parallel edge cracks could be analyzed as isolated single edge cracks was determined Numerical experimentation was conducted using ABAQUS. It was used to obtain the coordinate and stress information required in the local collocation method. The numerical models were created by maintaining one crack at a fixed length while varying the length of the second crack as well as the separation distance of the two cracks. The results obtained through the local collocation method were compared with the finite element obtained J-Integrals to verify the accuracy of the results. The results obtained in the analysis showed that the major factor in determining when the second crack's stress field has to be considered was the crack separation distance. It was found that a reduction in the second crack's length did not have a significant effect on overall stress intensity factors of the fixed crack. A larger change in the opening mode stress intensity factor can be seen by varying the crack separation distance. As well as seeing a steady reduction in shear mode stress intensity factors as the crack separation was increased. The results showed that after a certain crack separation distance the two cracks could be analyzed separately without introducing significant error into the stress field calculations.
Author : T. Nishioka
Publisher :
ISBN 13 :
Total Pages : 29 pages
Book Rating : 4.:/5 (227 download)
Download or read book Numerical Modeling of Dynamic Crack Propagation in Finite Bodies, by Moving Singular Elements. Part II. Results written by T. Nishioka and published by . This book was released on 1980 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt: Using the moving-singularity finite element method described in Part I of this paper, several problems of dynamic crack propagation in finite bodies have been analysed. Discussions of the effects of wave interactions on the dynamic stress-intensity factors are presented. The obtained numerical results are compared with the corresponding infinite domain solutions and other available numerical solutions for finite domains. (Author).
Author : Venkat Ramanan Krishnan
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (318 download)
Download or read book Numerical Solutions for Finite Strain Crack Tip Fields in Soft Incompressible Solids written by Venkat Ramanan Krishnan and published by . This book was released on 2009 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation concerns itself with problems involving cracks under finite deformation in incompressible hyperelastic materials with special application to soft materials. The main focus is on using numerical methods, in particular the finite element method (FEM), to find the solution of crack tip fields under applied far field loads, in materials undergoing axisymmetric, plane stress and plane strain deformations. In the first chapter a large strain finite element analysis is used to study the deformation of an incompressible Neo-Hookean half space in contact with a flat rigid cylindrical punch. Adhesion is assumed between the elastic solid and punch and the deformation is studied as the punch is retracted. Two interface conditions, frictionless and no slip, are considered. Numerical results are compared with prediction of small strain linear elastic (SSLE) theory. The results show that many aspects of the deformation are not captured by the SSLE theory. For example, the interfacial normal stress at the punch edge is much higher for the case with frictionless boundary condition. The deformation profiles are also very different. The results give important insights on how soft adhesives deform when they detach from a hard surface. The second chapter makes use of a finite element model to study the behavior of the large deformation field near the tip of a crack in a soft incompressible plane stress fracture specimen loaded in Mode I. Results are obtained for the case of a NeoHookean solid (ideal rubber) and a hyperelastic solid with exponentially hardening behavior. In contrast to the predictions of linear elastic fracture mechanics (LEFM), the near tip stress fields are dominated by the opening stress which shows a 1/R singularity for the Neo-Hookean material and a -1/RlnR singularity for the exponential hardening solid. The results show very similar qualitative behavior in the near tip stress fields despite the very large difference in strain hardening behavior of the two material models. Further, the results show that the near tip opening stress is controlled by the far field energy release rate for large applied loads. The third chaper presents a numerical study of finite strain deformation fields near the tip of an interface crack between a rigid substrate and an incompressible hyperelastic solid using the finite element method (FEM). The FEM simulations make use of a remeshing scheme to overcome mesh distortion. Analyses are carried out by assuming that the crack tip is either "pinned", i.e., the elastic material is perfectly bonded (full friction) to the rigid substrate, or frictionless. The focus is on a material which hardens exponentially. For both the frictionless interface and the pinned crack under plane stress deformation, it is found that the true stress field directly ahead of the crack tip is dominated by the normal stress (T22) and the crack face opens up smoothly. This is also true for an interface crack along a frictionless boundary in plane strain deformation. However, for a pinned interface crack under plane strain deformation, the true opening normal stress (T22) is found to be lower than the shear stress (T12) and the transverse normal stress (T11). Also, the crack opening profile for a pinned crack under plane strain deformation is completely different from those seen in plane stress and in plane strain (frictionless boundary condition). The crack face flips over and the tip angle is almost tangential to the interface. The results suggest that interface friction can play a very important role in interfacial fracture of soft materials on hard substrates.
Author : United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch
Publisher :
ISBN 13 :
Total Pages : 1080 pages
Book Rating : 4.E/5 ( download)
Download or read book Japanese Science and Technology, 1983-1984 written by United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch and published by . This book was released on 1985 with total page 1080 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 1252 pages
Book Rating : 4.F/5 ( download)
Download or read book Index to American Doctoral Dissertations written by and published by . This book was released on 1989 with total page 1252 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 724 pages
Book Rating : 4.E/5 ( download)
Download or read book Japanese Science and Technology written by and published by . This book was released on 1986 with total page 724 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Peter Dyson
Publisher : John Wiley & Sons
ISBN 13 : 0470697377
Total Pages : 238 pages
Book Rating : 4.4/5 (76 download)
Download or read book Fluid Properties at Nano/Meso Scale written by Peter Dyson and published by John Wiley & Sons. This book was released on 2008-09-15 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: Today’s scientific and engineering community has a good grasp on how to model fluid flows at macro and molecular scales, with well-developed theory and supporting technologies. Between these two extremes lies the nano/meso scale (i.e. in the range of 50nm-500nm) where fluid flow models continue to be problematic. Continuum models used at macro scales assume a negligible influence from molecular interactions, while molecular models do not predict flow well at nano/meso dimensions. The solution, and the subject of this book, is to use elements from both to capture correctly the proper physics (from the molecular scale) and provide a description in terms of useful fluid properties (as characterized on the continuum scale). Fluid Properties at Nano/Meso Scale is based on the authors’ past five years’ research that has yielded new innovations in fluid simulation strategies at the nano/meso scale. The authors approach this subject in a straightforward and easy to understand format, providing a first step into the subject for researchers at all levels. They present new tools that allow the numerical computation of fluid properties from first principles, enabling the reader to begin to model successfully fluids at nano/meso scale. It is hoped that these first steps will engender the further development and advancement of simulation techniques at this scale, and keep engineering simulation at the cutting edge of technology. Presents internationally leading developments in the field of fluid properties at nano/meso scale Provides the reader with the first steps to fluid modelling at nano/meso-scales as well as state-of-the-art applications Includes innovative and new simulation techniques along with a detailed examination of existing numerical methods
