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Crack Initiation And Propagation Mechanism Pdf

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Park, C.

In the present study the crack initiation and propagation is investigated in the ductile-brittle transition region by means of a microscopic model. In particular, the particles in the process zone in front of the crack tip are resolved discretely in finite element simulations. The competing mechanisms of particle debonding and possible subsequent void growth as well as particle breakage and cleavage of the metallic matrix are incorporated explicitly in the micromechanical model by means of a cohesive zone.

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Metal-induced embrittlement MIE of steel by indium has been studied using delayed failure tensile tests. The temperature and stress dependence of the kinetics of crack initiation and crack propagation in both liquid metal-induced and solid metal-induced cracking have been examined in the same system for the first time in MIE.

This was done using electrical potential-drop measurements along the indium-covered portion of the sample gage length to record the start and progress of cracking, and also through fractographic observations. In Part I of the report on this work, the experimental results are presented, and their implications with regard to crack propagation are discussed. In Part II, various mechanisms proposed in the literature for crack initiation are evaluated in the light of the experimental results and other known characteristics of MIE.

It is concluded that crack initiation in the embrittlement of steel by indium can best be explained by a mechanism involving stress-aided embrittler diffusion penetration of the base-metal grain boundaries, and it is suggested this may also be more generally true.

This is a preview of subscription content, access via your institution. Rent this article via DeepDyve. Lynn, W. Warke, and Paul Gordon: Mater. Stoloff and T. Johnston: Acta Met. Westwood and M. Kamdar: Phil. Robertson: Trans. Glikman, Y. Goryunov, V. Demin, and K. Sarycher: Izvest. Fizika , May , no.

Lynch: ARL Mat. Reports No. Google Scholar. Krishtal: Sov. Nauk SSSR. Sverdlovsk , , vol. Flegontova, B. Summ, and Y. Goryunov: Phys. Metals and Metall. Rostoker, J. McCaughey, and H. Bryukhanova, I. Andreeva, and V. Likhtman: Sov. Nichols and W. Rostoker: Trans. ASM , , vol. Iwata, Y. Asayama, and A. Sakamoto: Nippon Kinzaku Gakkaishi J. Japan Inst. Rinnovatore, J. Corrie, and H. Markus: Trans. Preece and A. Westwood: Fracture, Proc.

Pratt, ed. Zych: M. Lynn, Ph. Kassner: M. Rhines, J. Alexander, and W. Barclay: Trans. Paul Gordon: Metall. A , , vol. Summ, P. Rutman, Y. Goryunov: Fiziko-Khim. Rice and R. Thomson: Phil. Thompson and I. Bernstein, eds. Mason: Phil. Griffith: Phil. London , , vol. Kelley and N. Stoloff: Metall.

Johnson, N. Breyer, and J. Dally: Proc. Breyer and K. Johnson: J. Test, and Eval. Breyer and P. Gordon: Proc. Third Intl. Download references. Reprints and Permissions. Gordon, P. The mechanisms of crack initiation and crack propagation in metal-induced embrittlement of metals.

Metall Mater Trans A 13, — Download citation. Received : 09 February Issue Date : March Search SpringerLink Search. Abstract Metal-induced embrittlement MIE of steel by indium has been studied using delayed failure tensile tests. Immediate online access to all issues from Subscription will auto renew annually. References 1. An Authors Paul Gordon View author publications. View author publications. Rights and permissions Reprints and Permissions.

About this article Cite this article Gordon, P.

Fatigue of Materials II pp Cite as. The prediction of fatigue properties of structural materials is rightly recognized as one of the most important engineering problem. Therefore a basic understanding of the fundamental nature of fatigue crack initiation and growth in metals has long been a major scientific challenge starting with the first dislocation model of fatigue crack growth of Bilby et al. For this purpose understanding the process of emission of dislocations from cracks, and determining precise expressions for the size of the plastic zone size, the crack-tip opening displacement and the energy release rate of the cracks are some of the major technical challenges. In this short paper we comment briefly on some of our important recent results obtained theoretically and by in-situ TEM studies and discuss how they may contribute to the understanding of the phenomena.

Fatigue of Materials II pp Cite as. The prediction of fatigue properties of structural materials is rightly recognized as one of the most important engineering problem. Therefore a basic understanding of the fundamental nature of fatigue crack initiation and growth in metals has long been a major scientific challenge starting with the first dislocation model of fatigue crack growth of Bilby et al. For this purpose understanding the process of emission of dislocations from cracks, and determining precise expressions for the size of the plastic zone size, the crack-tip opening displacement and the energy release rate of the cracks are some of the major technical challenges. In this short paper we comment briefly on some of our important recent results obtained theoretically and by in-situ TEM studies and discuss how they may contribute to the understanding of the phenomena. Unable to display preview.

Rock masses are heterogeneous materials containing a large number of discontinuities, and the failure of the natural rock mass is induced by the crack propagation and coalescence of discontinuities, especially for the rock mass around tunnel or underground space. Because the deformation or failure process of jointed rock mass exhibits strongly nonlinear characteristics, it is also very difficult to predict the strength and failure modes of the rock mass. Therefore, it is very necessary to study the failure mechanisms of jointed rock mass under different stress conditions. Apart from the stress condition, the discontinuities geometry also has a significant influence on the mechanical behavior of jointed rock mass. Then, substantial, experimental, and numerical efforts have been devoted to the study of crack initiation, propagation, and coalescence of rock or rock-like specimens containing different kinds of joints or fissures.


PDF | Propagation of physically small cracks and macrocracks (i.e., cracks of the size of the order of millimeters and more) can be quantitatively.


Metal-induced embrittlement MIE of steel by indium has been studied using delayed failure tensile tests. The temperature and stress dependence of the kinetics of crack initiation and crack propagation in both liquid metal-induced and solid metal-induced cracking have been examined in the same system for the first time in MIE. This was done using electrical potential-drop measurements along the indium-covered portion of the sample gage length to record the start and progress of cracking, and also through fractographic observations. In Part I of the report on this work, the experimental results are presented, and their implications with regard to crack propagation are discussed. In Part II, various mechanisms proposed in the literature for crack initiation are evaluated in the light of the experimental results and other known characteristics of MIE.

Rock fracture due to high-pressure fluid jetting and insert indentation was experimentally investigated. In the frame of this article, indentation designates the process of pressing a tungsten carbide insert TCI for roller cone bits displacement-controlled into the rock surface. Under atmospheric conditions, several crystalline and one sedimentary rock type were tested. Depending on the size, type and bonding of the mineral grains, distinct differences in fracture behaviour were observed.

Show all documents Fatigue Crack Initiation and Crack Growth Studies for Pipes made of Carbon Steel The failure of the piping components may occur well below the allowable stress limits even under normal operating conditions. This may be attributed to the presence of flaws which have either gone undetected during pre-service inspection or appeared in due course of its service. Therefore, an alternate fail-safe design philosophy such as Leak-Before-Break LBB which is based on fracture mechanics concepts is adopted and requires rigorous integrity assessment of piping component with postulated part through thickness flaw. It is required to be demonstrated that the unstable tearing will never occur before the crack penetrates through thickness and gives easily detectable leakage. This requires investigation on fatigue crack initiation followed by fatigue crack growth FCG of piping components with different postulated part through flaws for the qualification of LBB design criterion.

Damage and Fracture Behavior of Rock

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1 Comments

Ingeberg A. 11.05.2021 at 00:38

Meta I-induced embrittlement (MIE) of steel by indium has been studied using delayed failure tensile tests. The temperature and stress dependence of the.

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