Download or read book Small Scale Yielding Analysis of Mixed Mode Plane Strain Crack Problems written by CF. Shih and published by . This book was released on 1974 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: The small-scale yielding analysis of an elastic-plastic body with a line crack under plane-strain conditions subject to combinations of Mode I and II loadings is examined. The analysis of the near-tip field follows the works of Hutchinson and Rice and Rosengren. Dominant singularity solutions governing the asymptotic behavior of the stresses and strains at the crack tip are obtained for the complete range of loadings between Mode I and II. The results of an accurate finite element technique, which imbeds the dominant singularity solutions, directly relates the near-tip behavior to the elastic stress intensity factors KI and KII. Implications of this study to mixed mode fracture mechanics is also discussed, particularly with respect to the direction of crack initiation and the relation of fracture toughness under mixed modes to that in Mode I. Details of the mixed mode plastic zone sizes and shapes are also given.
Download or read book Small Scale Yielding Analysis of Mixed Mode Plane Strain Crack Problems written by Choon-Fong Shih and published by . This book was released on 1973 with total page 41 pages. Available in PDF, EPUB and Kindle. Book excerpt: The small scale yielding analysis of an elastic-plastic body with a lone crack under plane strain conditions subject to combinations of Mode I and II loadings is examined. Dominant singularity solutions governing the asymptotic behavior of the stresses and strains at the crack tip are obtained for the complete range of loadings between Mode I and II. The results of an accurate finite element technique, which imbeds the dominant singularity solutions, directly relates the near-tip behavior to the elastic stress intensity factors KI and KII. Implications of this study to mixed mode fracture mechanics is also discussed, particularly with respect to the direction of crack initiation and the relation of fracture toughness under mixed models to that in Mode I. Details of the mixed mode plastic zone sizes and shapes are also given. (Author).
Download or read book Plastic Analysis of Mixed Mode Plane Stress Crack Problems written by John W. Hutchinson and published by . This book was released on 1973 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two parameters are identified for characterizing the deformation in the plastic zone near the tip of a crack when mixed mode conditions prevail. Details of the near-tip stress and strain distributions are presented for hardening materials in which a diffuse plastic zone occurs under plane stress conditions. For small scale yielding the two near-tip parameters are related to the two elastic stress intensity factors for combined Mode I and Mode II. (Author).
Download or read book Numerical Assessments of Cracks in Elastic Plastic Materials written by Huang Yuan and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this book a systematic discussion of crack problems in elastic-plastic materials is presented. The state of the art in fracture mechanics research and assessment of cracks is documented, with the help of analytic, asymptotic methods as well as finite element computations. After a brief introduction to fracture mechanics, the two-parameter concept for stationary cracks is studied in addition to the issues in three-dimensional crack fields under coupling with strong out-of-plane effects. Cracks along interfaces and crack growth problems under mixed mode conditions are also treated. A systematic study of stress singularities for different notches is accompanied by detailed finite element computations.
Download or read book Elastic Plastic Mixed Mode Fracture Criteria and Parameters written by Valery N. Shlyannikov and published by Boom Koninklijke Uitgevers. This book was released on 2003-01-17 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains an elastic-plastic analysis of accumulate damage and fracture with practical applications with engineering materials and structure fatigue life estimations. Models as well as practical applications are presented, which makes the book interesting for both practitioners and theoretical researchers. Particular emphasis is laid on new approaches to the mixed-mode problem in fatigue and fracture, and especially to the fracture damage zone (FDZ) approach. The results of the demonstrated experimental and theoretical research lead to the presentation of different crack growth models, predicting the crack growth rate and, fatigue life of an initially angled crack under biaxial loads of arbitrary direction. Special attention is paid to the practical applications of the suggested models.
Download or read book Methods of Analysis and Solutions of Crack Problems written by George C. Sih and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 562 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is weH known that the traditional failure criteria cannot adequately explain failures which occur at a nominal stress level considerably lower than the ultimate strength of the material. The current procedure for predicting the safe loads or safe useful life of a structural member has been evolved around the discipline oflinear fracture mechanics. This approach introduces the concept of a crack extension force which can be used to rank materials in some order of fracture resistance. The idea is to determine the largest crack that a material will tolerate without failure. Laboratory methods for characterizing the fracture toughness of many engineering materials are now available. While these test data are useful for providing some rough guidance in the choice of materials, it is not clear how they could be used in the design of a structure. The understanding of the relationship between laboratory tests and fracture design of structures is, to say the least, deficient. Fracture mechanics is presently at astandstill until the basic problems of scaling from laboratory models to fuH size structures and mixed mode crack propagation are resolved. The answers to these questions require some basic understanding ofthe theory and will not be found by testing more specimens. The current theory of fracture is inadequate for many reasons. First of aH it can only treat idealized problems where the applied load must be directed normal to the crack plane.
Download or read book An Analytical Investigation of Plane Strain Elastic plastic Crack Fields for Mode I Quasistatic Growth from Small scale Yielding to General Yielding written by Xing-Yu Chen and published by . This book was released on 1989 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fracture Analysis written by and published by ASTM International. This book was released on 1974 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Plane Stress Mixed Mode Crack Tip Stress Fields Characterized by a Triaxial Stress Parameter and a Plastic Deformation Extent Based Characteristic Length written by MA. Sutton and published by . This book was released on 2003 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt: Residual strength assessment in aircraft fuselage structures requires that a general criterion for mixed-mode fracture of ductile materials be developed. An understanding of mixed-mode crack-tip stress fields is essential to define viable fracture parameters and perform accurate fracture analysis. In the present study, a self-similar family of mixed-mode crack-tip stress fields proposed by the present authors is studied in detail for plane stress problems under conditions ranging from small scale yielding to large scale yielding. Analytical and numerical studies indicate that stress and plastic strain in the crack tip region can be characterized by a plastic strain extent based characteristic length, Lp, and the crack tip region stress triaxiality constraint parameter, Am, defined as the ratio of mean stress over effective stress (?m/?e). Results from all cases indicate that the proposed, self-similar family of mixed-mode crack-tip stress fields accurately represents the stress fields for both SSY models and actual fracture specimen geometry. The crack tip stress fields are shown to belong to a family of solutions parameterized by Am and Lp when the distance from crack tip, r, is measured in terms of its normalized value by the characteristic length scale, r/Lp. Specifically, in the tensile fracture dominated crack growth direction (locally Mode I direction), it is found that stress triaxiality takes its maximum value. This condition will promote the nucleation of micro-voids from large particles, resulting in Mode I dimpled fracture. In the shear dominated crack growth direction fracture (locally Mode II direction), corresponding to the direction of maximum Lp, it is shown that the effective and shear stresses reach their maximum values. This condition promotes the formation of an intense slip-band, resulting in Mode II fracture.
Download or read book Fracture Analysis written by Paul C. Paris and published by ASTM International. This book was released on 1974 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Elastic Plastic Mixed Mode Fracture Criteria and Parameters written by Valery N. Shlyannikov and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 255 pages. Available in PDF, EPUB and Kindle. Book excerpt: My wife Tatyana, daughter Mariya, son Alexandr It is well known that the mixed-mode conditions appear when the direction of the applied loading does not coincide with the orthogonal K,-Kn-Km space. In general, in the industrial practice the mixed-mode fracture and the mixed-mode crack growth are more likely to be considered the rule than the exception. Miller et al. considers that cracks can grow due to a mixture of processes (ductile and brittle), mechanisms (static, fatigue, creep) and loading modes (tension, torsion, biax ial/multiaxial). Additionally mixed-mode crack-extension can be affected by many other considerations such as artifact geometry (thin plates, thick shells, and the size, shape and orientation of the defect), environmental effects (temperature, gaseous and liquid surroundings), material state (crystallographic structure, heat treatment and route of manufacture) and stress conditions (out-of-phase and ran dom loading effects). The main feature of the mixed-mode fracture is that the crack growth would no longer take place in a self-similar manner and does not follow a universal trajec tory that is it will grow on a curvilinear path. There are various fracture criteria, which predict the behavior of cracks in brittle and ductile materials loaded in combined modes. Linear elastic fracture mechanics (LEFM) criteria predict basi cally the same direction for crack propagation. Cracks in brittle materials have been shown to propagate normal to the maximum tangential stress. In ductile ma terials yielding occurs at the crack tip and LEFM is no longer applicable.
Download or read book IUTAM Symposium on Nonlinear Analysis of Fracture written by J.R. Willis and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume constitutes the Proceedings of the IUTAM Symposium on 'Nonlinear Analysis of Fracture', held in Cambridge from 3rd to 7th Septem ber 1995. Its objective was to assess and place on record the current state of understanding of this important class of phenomena, from the standpoints of mathematics, materials science, physics and engineering. All fracture phenomena are nonlinear; the reason for inclusion of this qualification in the title was to reflect the intention that emphasis should be placed on distinctive aspects of nonlinearity, not only with regard to material consti tutive behaviour but also with regard to insights gained, particularly from the mathematics and physics communities, during the recent dramatic ad vances in understanding of nonlinear systems in general. The expertise represented in the Symposium was accordingly very wide, and many of the world's greatest authorities in their respective fields participated. The Symposium remained focussed on issues of practical significance for fracture phenomena, with concentration on aspects that are still im perfectly understood. The most significant unifying issue in this regard is that of scale: this theme was addressed from several perspectives. One important aspect is the problem of passing information on one scale up or down, as an input for analysis at another scale. Although this is not always the case, it may be that the microscopic process of fracture is understood in some particular class of materials.
Download or read book Fatigue and Fracture Mechanics written by Walter G. Reuter and published by ASTM International. This book was released on 2002-12-31 with total page 778 pages. Available in PDF, EPUB and Kindle. Book excerpt: Covering the whole of Asia and the Pacific region, this text provides both an analytic overview and specific data for each of the 60 countries. Introductory chapters cover regional issues, including: a regional review with the year's trends, developments and key events' analysis of the threat of terrorism in the region; the effects of deflation on the economy; the water crisis and its impact on the poor; and the successes and failures of micro-credit in the region.
Download or read book Quasi Static Steady Crack Growth in Small Scale Yielding written by RH. Dean and published by . This book was released on 1980 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: A numerical analysis of quasi-static, steady-state crack growth under small-scale yielding conditions has been carried out for antiplane shear (Mode III) and plane strain, Mode I. In addition to results for an elastic-perfectly plastic solid, the study includes results relating to the influence of strain hardening on stable crack growth. Limited results based on a corner theory of plasticity give some indication of the extent to which stable crack growth predictions are sensitive to the type of plasticity theory used.
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:
Download or read book Mixed mode Crack Behavior written by Keith John Miller and published by ASTM International. This book was released on 1999 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fracture Mechanics written by Dominique P. Miannay and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: Intended for engineers from a variety of disciplines dealing with structural materials, this text describes the current state of knowledge. It begins by describing the fracture process at the two extremes of scale: first in the context of atomic structures, then in terms of a continuous elastic medium. Treating the fracture process in increasingly sophisticated ways, the book then considers plastic corrections and the procedures for measuring the toughness of materials. Practical considerations are then discussed, including crack propagation, geometry dependence, flaw density, mechanisms of failure by cleavage, the ductile-brittle transition, and continuum damage mechanics. The whole is rounded off with discussions of generalised plasticity and the link between the microscopic and macroscopic aspects, and problems are provided at the end of each chapter.
