Results 211 to 220 of about 4,424 (262)

Approximate Description of Crack Kinking and Curving

Journal of Applied Mechanics, 1981
An approximate description is given of the slightly out-of-plane growth of a straight crack under mixed-mode loading and in the presence of an in-plane stress. By using a perturbation technique, conditions are derived for the deviation of the crack from straightness.
Karihaloo, B. L., Keer, L. M., Nemat-Nasser, S., Oranratnachai, A.   +3 more
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Dynamic Crack Curving and Crack Branching

1983
The dynamic crack curving criterion proposed by Ramulu and Kobayashi1 is based on a micro-mechanic model of continuous micro- flaw growth and coalescence in the vicinity of the moving crack tip. It is a dynamic extension of the crack curving criterion proposed by Streit and Finnie.2 When an off-axis micro-flaw connects with the crack tip, the crack is ...
M. Ramulu, A. S. Kobayashi
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Crack closure and crack path prediction for curved cracks under thermal load

Engineering Fracture Mechanics, 1993
Abstract Based on an integral equation formulation, a boundary element method is presented for the analysis of curved cracks under mechanical and thermal load. It takes into account possible load and crack shape-dependent crack closure effects. In conjunction with a suitable crack growth criterion, the method enables, by means of an incremental ...
D. Gross, ST. Heimer
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Determination of Short‐Crack Toughness Curves

Journal of the American Ceramic Society, 1996
Measurements of indentation crack length vs applied bend stress were used to develop a new method of analysis for determining short‐crack toughness curves. Three glass‐ceramics and a polycrystalline alumina were used as prototype test materials. Crack‐shape effects were incorporated into the analysis.
Stanley M. Smith, Ronald O. Scattergood
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Crack curving under mode-I loading

International Journal of Fracture, 1996
The whole history of failure of a rectangular panel with two symmetrical notches and a central crack subjected to a progressively increasing tension load normal to the crack plane is studied. The material of the panel exhibits substantial plastic deformation prior to fracture.
C. G. Thireos, E. E. Gdoutos
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On crack kinking and curving

Mechanics of Materials, 1982
Abstract This paper attempts to provide a comprehensive summary of results on the following topics relating to crack kinking and curving: (a) Stress intensity factors for kinked cracks under combined loading; (b) applicability of Irwin's energy-release rate formula to kinked cracks; and (c) reasons behind crack kinking and curving.
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A note on curved cracked beams

International Journal of Solids and Structures, 1993
Abstract This paper is concerned with evaluating stress intensity factors for a curved cracked beam of small to moderate curvature using a simple engineering method which allows us to estimate the strain energy release rate based on elementary beam theory.
Müller, W. H., Herrmann, G., Gao, H.
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Nonlocal Mechanics of Crack Curving

1983
The nonlocal elasticity solution is obtained for the Griffith crack problem under combined loadings, Modes I and II. It is shown that the fracture begins at a critical point in the neighborhood of the crack tip. The location of the critical point is determined and the critical angle at which the crack begins to deviate from its straight line path is ...
A. Cemal Eringen, A. Suresh
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Master curve for viscous crack healing

Materials Letters, 2018
A novel method to generalize kinetic data of viscous crack healing in glasses is proposed. The method assumes that crack healing progress is proportional to the healing time, t, and indirect proportional to viscosity, n. This way, crack length and crack width data, normalized to the initial crack length and plotted versus t/n, allow to compare crack ...
C. Blaeß, R. Müller
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Constant-probability crack growth curves

Engineering Fracture Mechanics, 1988
Abstract This paper details a stochastic, time-inhomogeneous model that serves as a theoretical basis for the prediction of crack growth and its variability under constant-amplitude loading. Crack evolution is described as a set of constant probability curves, each of whose points possess equal probability of advancing from one position to another ...
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