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Author: MP. Wnuk Publisher: ISBN: Category : Analysis Languages : en Pages : 32
Book Description
This study has been inspired by two proposed models for stable crack growth described by Sih and Kiefer (1979) and Wnuk and Sedmak (1980). Basic assumptions of the second model are reexamined and refined. Although the mathematical analyses involved in both approaches are widely different, it is shown that the physical assumptions underlying these two models are analogous. Both treatments assume a "quantum" nature of crack growth by representing extension of a stable crack as a sequence of steps each of which is executed as a finite jump in the current crack length. While Sih and Kiefer employed the numerical approach to treat the three-dimensional (3D) elastic-plastic fracture problem, here a highly idealized line-plasticity model, modified by an addition of the final stretch growth law, is used.
Author: MP. Wnuk Publisher: ISBN: Category : Analysis Languages : en Pages : 32
Book Description
This study has been inspired by two proposed models for stable crack growth described by Sih and Kiefer (1979) and Wnuk and Sedmak (1980). Basic assumptions of the second model are reexamined and refined. Although the mathematical analyses involved in both approaches are widely different, it is shown that the physical assumptions underlying these two models are analogous. Both treatments assume a "quantum" nature of crack growth by representing extension of a stable crack as a sequence of steps each of which is executed as a finite jump in the current crack length. While Sih and Kiefer employed the numerical approach to treat the three-dimensional (3D) elastic-plastic fracture problem, here a highly idealized line-plasticity model, modified by an addition of the final stretch growth law, is used.
Author: M.J. Pindera Publisher: Springer Science & Business Media ISBN: 9400961987 Category : Science Languages : en Pages : 363
Book Description
The general objective of the Tenth Canadian Fracture Conference was to respond to progress in the engineering sciences - in particular with r- pect to rapidly developing new trends in the theory and methodology of researcr and designing - and to the resulting needs of practical engineering in the specific field of fracture mechanics and related areas of engineering mechanics. The basic underlying issue is the theory and practice of physical analytical and iconic (reduced) modelling of the actually involved physical processes and of the responses of physical bodies and systems to actual energy flow - a problem which is becoming dominant in all fields of the natural sciences. Accordingly, the theme of the CFCIO was "Modelling Problems in Crack Tip Mechanics", a well defined and limited subject, the scope of treatment of which can be as deep and as comprehensive as an in volved researcher wishes it to be.
Author: G.J. Weng Publisher: Springer Science & Business Media ISBN: 1461389194 Category : Science Languages : en Pages : 647
Book Description
Toshio Mura has written extensively on micromechanics over the years, and in part due to his writings and many others in the field, micromechanics has gradually emerged as a recognized discipline in the study of mechanics of materials. The idea is to bring both the mechanics and physics on the micro scopic level to the macroscopic scale, so that the deformation and fracture processes of materials can be better understood. While much apparently remains to be done, this approach has already shed new light on certain selected topics and has proved to be fruitful. It is indeed a happy occasion to celebrate both Toshio's upcoming 65th birthday and the emergence of this young science at the same time. The volume contains thirty-seven original articles on the related topics of micromechanics and inhomogeneity; it is presented to Toshio by his friends, colleagues, and admirers as a wish for his good health and continuing pro ductivity. The contributors belong to both the applied mechanics and the materials communities, all with a common belief that micromechanics is an indispensable area of research. It is hoped that this somewhat balanced structure will make the volume more useful to a wider range of readers, and that in the meantime it will still reflect more or less the spectrum of Toshio's lifelong works. As Editors we have at the outset set the highest possible standards for the book, with a keen anticipation that the volume will be widely circulated for many years to come.
Author: Juan R. Donoso Publisher: ISBN: Category : Common format Languages : en Pages : 21
Book Description
A new method of construction of the J-R curve has been proposed recently that makes use of a postulated crack growth law relating stable crack extension, ? a, to plastic displacement, vpl. An analytical treatment of both the J-?a curve and the force-displacement, P-v, curve, is now possible even under circumstances in which the sole inputs are the P-v curve and the initial and final crack size values. Based upon this crack growth law concept, and on the common and the concise format equations of Donoso and Landes, an alternative way of estimating the amount of stable crack growth is presented. This alternative method, which allows for the evaluation of the crack size at any value of force or displacement along the P-v curve, has been applied to some examples of C(T) fracture test specimens that have crack extension values obtained by the unloading compliance method. The results are quite encouraging, and the method is extended here to cases in which there are no crack extension measurements available.
Author: MP. Wnuk
Author: MP. Wnuk
Author: J. C. Lewis
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Author: M.J. Pindera
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Author: G.J. Weng
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Author: Juan R. Donoso
Author: Changyu Hwang
Author: S. J. Hudak