Download or read book Measurement of Three Dimensional Effects in Fracture Mechanics written by CW. Smith and published by . This book was released on 1988 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: After citing several experimental methods used for measuring three-dimensional effects in opaque and transparent cracked bodies, an integrated optical method is focused upon for obtaining two independent estimates of fracture parameters associated with linear elastic fracture mechanics (LEFM). Results of the use of these methods to study the effect of free surfaces upon the stress singularity of cracks intersecting them are presented and a means of interpreting the results within the framework of LEFM is suggested.
Download or read book Fracture Mechanics Nineteenth Symposium written by Thomas A. Cruse and published by ASTM International. This book was released on 1988 with total page 936 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Three Dimensions Versus Two Dimensions in Fracture Mechanics written by JL. Swedlow and published by . This book was released on 1988 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study shows that modern-day fracture mechanics has strictly two-dimensional origins. Certain difficulties arise, for example, in meeting fatigue crack-front straightness requirements. Some insight into this problem is available from an analytical study of an elastic thick plate with a central crack, the M(T) specimen. The study found that modest changes in the crack-front shape have a dramatic effect on the distribution of G, the elastic energy release rate. Further examination of the internal stress distribution shows that there is no region in the vicinity of the crack front that can be credibly described as plane stress, whereas an interior region sensibly replicates plane strain. Finally, a call is issued for the development of a three-dimensional fracture mechanics.
Download or read book Experimental Evaluation of Three Dimensional Effects in Cracked Motor Grain Geometries written by and published by . This book was released on 1995 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: A series of experiments utilizing a refined frozen stress photoelastic analysis were conducted on a generic motor grain geometry consisting of six equally spaced fins in order to study the feasibility of measuring crack growth and stress intensity factor (SIF) distribution along the grown flaw borders of internal surface cracks under internal pressure and corresponding corner singularity orders where the cracks intersected fin surfaces. Subsequently, these methods were applied to scale models of a real motor grain. Parallel studIes using a coarse grid method were conducted on cracked inert propellant and pure binder biaxial models in order to study the influence of hard particles on crack opening and growth and to characterize the material behavior of simulated motor grain over an environmental range typical of transport and storage of rockets. Uncracked specimens were used to study stress relaxation and using acousto-ultrasonics, damage development was measured. Results showed that (1) crack geometry and SIF distributions were generally three dimensional but, in special cases, could be predicted with simple two dimensional models, (2) near tip opening and growth mechanisms were the same in both pure binder and inert propellant but that a non-linear blunt-growth-blunt phenomenon, occurred at all temperatures except -65 deg F where the blunting was suppressed, simulating dosely linear elastic fracture mechanics behavior, (3) measured corner singularity orders were comparable to theoretical results in the photoelastic models, in the simulated propellant models, displacement values were greater for blunted than for sharp crack tips, (4) damage accumulation was best described by an energy content parameter in the acousto-ultrasonic method. (AN).
Download or read book Fracture Mechanics written by and published by . This book was released on 1994 with total page 832 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Crack Paths written by L. P. Pook and published by Witpress. This book was released on 2002 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many engineering structures and components contain cracks or crack-like flaws and it is widely recognized that crack growth must be considered both in the design and analysis of failures. The complete solution of a crack growth problem therefore includes determination of the crack path. At present the factors controlling the path taken by a propagating crack are not completely understood. In general crack paths are difficult to predict, while in practice their development in structures is often determined by large-scale structural tests. In introductory texts on fracture mechanics it is usually assumed that the crack path is known, either from theoretical considerations, or from the results of laboratory tests.
Download or read book Fracture Mechanics written by Satya N. Atluri and published by ASTM International. This book was released on 1992 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: Papers of the June 1990 meeting held in Atlanta, Ga. The first volume (47 papers) concentrates on experimental and theoretical aspects of fracture mechanics. Volume two (26 papers) covers numerical and computational approaches. Topics include: ductile fracture, high-temperature and time-dependent fr
Download or read book Fracture Mechanics written by John H. Underwood and published by ASTM International. This book was released on 1986 with total page 837 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fracture Mechanics written by D. T. Read and published by ASTM International. This book was released on 1988 with total page 1108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fracture Mechanics written by and published by ASTM International. This book was released on 1989 with total page 685 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Application of Imaging Techniques to Mechanics of Materials and Structures Volume 4 written by Tom Proulx and published by Springer Science & Business Media. This book was released on 2012-08-15 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: This the fourth volume of six from the Annual Conference of the Society for Experimental Mechanics, 2010, brings together 58 chapters on Application of Imaging Techniques to Mechanics of Materials and Structure. It presents findings from experimental and computational investigations involving a range of imaging techniques including Recovery of 3D Stress Intensity Factors From Surface Full-field Measurements, Identification of Cohesive-zone Laws From Crack-tip Deformation Fields, Application of High Speed Digital Image Correlation for Vibration Mode Shape Analysis, Characterization of Aluminum Alloys Using a 3D Full Field Measurement, and Low Strain Rate Measurements on Explosives Using DIC.
Download or read book Three dimensional Stress Distribution Near a Sharp Crack in a Plate of Finite Thickness written by G. H. Sih and published by . This book was released on 1966 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: An attempt has been made to investigate the three-dimensional stress distribution near the tip of a semi-infinite crack embedded in an infinite plate of arbitrary thickness. The problem is formulated by means of three biharmonic functions in the classical theory of elasticity as developed by Galerkin. The eigenfunction expansion technique of Williams for solving two-dimensional crack problems is incorporated into the three-dimensional crack analysis. It is found that the stresses rr, theta theta, zz, r theta are singular of the order of r( -1/2), r being the distance measured from the crack point, but the transverse shear components rz, theta z are bounded everywhere in the plate. Determined in an approximate manner is the intensity of the crack-edge stress field which depends on the thickness coordinate of the plate. The results provide an improved understanding of the three-dimensional aspects of fracture theories, particularly on the effect of plate thickness.
Download or read book Image Correlation for Shape Motion and Deformation Measurements written by Michael A. Sutton and published by Springer Science & Business Media. This book was released on 2009-04-21 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt: Image Correlation for Shape, Motion and Deformation Measurements provides a comprehensive overview of data extraction through image analysis. Readers will find and in-depth look into various single- and multi-camera models (2D-DIC and 3D-DIC), two- and three-dimensional computer vision, and volumetric digital image correlation (VDIC). Fundamentals of accurate image matching are described, along with presentations of both new methods for quantitative error estimates in correlation-based motion measurements, and the effect of out-of-plane motion on 2D measurements. Thorough appendices offer descriptions of continuum mechanics formulations, methods for local surface strain estimation and non-linear optimization, as well as terminology in statistics and probability. With equal treatment of computer vision fundamentals and techniques for practical applications, this volume is both a reference for academic and industry-based researchers and engineers, as well as a valuable companion text for appropriate vision-based educational offerings.
Download or read book Fracture Mechanics written by J. P. Gudas and published by ASTM International. This book was released on 1990 with total page 615 pages. Available in PDF, EPUB and Kindle. Book excerpt: Papers from the 21st National Symposium on Fracture Mechanics, held in Annapolis, Md., June 1988, present new work in elastic-plastic fracture, dynamic fracture, transition fracture in steels, micromechanical aspects of the fracture process, computational mechanics, fracture mechanics testing, and a
Download or read book Fracture Mechanics written by R. A. Smith and published by Elsevier. This book was released on 2013-10-22 with total page 255 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fracture Mechanics: Current Status, Future Prospects presents the remarkable increase in the number of tools available for engineers to deal with cracked structures in a quantitative manner. This book discusses the acceptance of the stress intensity factor as a distinguishing similitude parameter that properly accounts for the applied mechanics near crack tips in several cases of practical interest. Organized into nine chapters, this book begins with an overview of the competing micromechanics of fracture, including cleavage, rupture, ductile fracture, and intergranular creep fracture. This text then reviews the characterization of crack tip stress fields by the stress intensity factor. Other chapters consider the analysis of fatigue cracking in a large generator rotor. This book discusses as well the use of Green's functions in the determination of stress intensity factors. The final chapter deals with the size effect with regard to extension of sharp cracks in technological materials. This book is a valuable resource for environmental and mechanical engineers.
Download or read book A Dual Boundary Element Formulation for Three dimensional Fracture Analysis written by Andrew John Wilde and published by Computational Mechanics. This book was released on 2000 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt: This monograph is concerned with the study of Dual Boundary Element formulation using continuous elements in three dimensions and its application to the analysis of fracture problems and crack growth. Formulations for modelling geomechanical fracture are also presented.
Download or read book Fatigue and Fracture Mechanics written by John H. Underwood and published by ASTM International. This book was released on 1997 with total page 697 pages. Available in PDF, EPUB and Kindle. Book excerpt:
