Finite Deformation Analysis of Crack Tip Opening in Elastic-plastic Materials and Implications for Fracture Initiation PDF Download
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Author: Robert M. McMeeking
Publisher:
ISBN:
Category :
Languages : en
Pages : 68
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Book Description
Author: Robert M. McMeeking
Publisher:
ISBN:
Category :
Languages : en
Pages : 68
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Analyses of the stress and strain fields around smoothly blunting crack tips in both non-hardening and hardening elastic-plastic materials, under contained plane strain yielding and subject to mode I opening loads, have been carried out by a finite element method suitably formulated to admit large geometry changes. The results include the crack tip shape and near-tip deformation field, and the crack tip opening displacement has been related to a parameter of the applied load, the J-integral. The hydrostatic stresses near the crack tip are limited due to the lack of constraint on the blunted tip, limiting achievable stress levels except in a very small region around the crack tip in power law hardening materials. The J-integral is found to be path independent except very close to the crack tip in the region affected by the blunted tip. Models for fracture are discussed in the light of these results including one based on the growth of voids. The rate of void growth near the tip in hardening materials seems to be little different from the rate in non-hardening materials when measured in terms of crack tip opening displacement, which leads to a prediction of higher toughness in hardening materials. It is suggested that improvement of this model would follow from better understanding of void-void and void-crack coalescence and void nucleation, and some criteria and models for these are discussed. The implications of the finite element results for fracture criteria based on critical stress, strain or both are discussed with respect to transition of fracture mode and the angle of initial crack growth. Localization of flow is discussed as a possible fracture model and as a model for void-crack coalescence.
Author: K.H. Schwalbe
Publisher: Springer Science & Business Media
ISBN: 3642828183
Category : Science
Languages : en
Pages : 365
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Book Description
Sponsored by Studiengesellschaft zur Förderung der Kern- energieverwertung im Schiffbau und Schiffahrt e.V. (KEST), Hamburg/Stiftung Volkswagenwerk, Hannover
Author: Huang Yuan
Publisher: Springer Science & Business Media
ISBN: 3540458824
Category : Science
Languages : en
Pages : 318
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Book Description
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.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Topics covered include: finite deformation analysis of crack tip opening in elastic-plastic materials and implications for fracture initiation; path dependence of the J-integral and the role of J as a parameter characterizing the near tip field; separation energy rate for a finite crack growth step from a blunted monotonically loaded crack tip in an elastic-plastic material; finite element calculations of separation energy rate; blunting of a plane strain crack tip into a shape with vertices; and localization of plastic flow at a crack tip as a mechanism for the initiation of plane strain ductile fracture. (GHT).
Author:
Publisher: ASTM International
ISBN:
Category :
Languages : en
Pages : 779
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Book Description
Author: John D. Landes
Publisher: ASTM International
ISBN: 9780803103306
Category : Technology & Engineering
Languages : en
Pages : 790
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Book Description
Author: John D. Landes
Publisher: ASTM International
ISBN: 0803112572
Category : Fracture mechanics
Languages : en
Pages : 634
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Book Description
Author: J. P. Gudas
Publisher: ASTM International
ISBN: 0803112998
Category : Fracture mechanics
Languages : en
Pages : 615
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Book Description
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
Author:
Publisher: ASTM International
ISBN:
Category :
Languages : en
Pages : 766
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Book Description
