Results 221 to 230 of about 4,688 (263)

On crack branching and curving in a finite body

International Journal of Fracture, 1983
The problem of a slightly non-collinear, quasi-static crack growth in a finite brittle solid is examined. A solution method which accounts for the finite geometry and the applied boundary conditions is presented. The approach uses the results of the first order perturbation solution for non-collinear crack extension from the tip of a semi-infinite ...
Y. Sumi, S. Nemat-Nasser, L. M. Keer
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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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Dynamic crack curving—A photoelastic evaluation

Experimental Mechanics, 1983
A dynamic-crack-curving criterion, which is valid under pure Mode I or combined Modes I and II loadings and which is based on either the maximum circumferential stress or minimum strain-energy-density factor at a reference distance ofr 0 from the crack tip, is verified with dynamic-photoelastic experiments ...
M. Ramulu, A. S. Kobayashi
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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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Bayesian Modeling For Fatigue Crack Curves

1992
An accurate assessment of the propagation of cracks in materials (“metal fatigue”) is important to the structural design and the development of preventive maintenance programs for many engineering structures, including critical aerospace components. Interest is centered on modeling the lifetime process, N(a), which represents the number of load cycles ...
Panickos N. Palettas, Prem K. Goel, Purushottam W. Laud   +2 more
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Crack curving in anisotropic elastic solids

Engineering Fracture Mechanics, 1993
Abstract The stress analysis for slightly curved cracks in an elastic anisotropic homogeneous solid is given by using a perturbation method combined with the approach of Muskhelishvili. For predicting the direction of the crack growth, higher order asymptotic stress fields at the tips of quasi-statically growing cracks under planar loading conditions
Y. Xu, L.M. Keer
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Resistance Curve Analysis of Surface Cracks

1994
In this work, elastic-plastic fracture mechanics (EPFM) methods are extended to study the behavior of surface cracks. The material used is a tungsten inert gas (TIG) welded 2219-aluminum alloy, welded with 2319 weld wire. Calibration and a crack-growth test were performed. A multiple specimen R-curve technique was used.
HA Ernst, PJ Rush, DE McCabe
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Modelling of Crack Growth Resistance Curves

1983
It has been postulated that cracking in fibre reinforced cement composites occurs when the effective stress intensity factor at the tip of a crack reaches a critical value Ki corresponding to the initiation of fracture in the matrix. This stress intensity factor can be separated into two components K = KR + Kr = Ki where KR is the stress intensity ...
R. M. L. Foote, G. P. Steven
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A kink in the fatigue crack growth curve

International Journal of Fatigue, 1984
Abstract The effect of grain size on the near threshold stress intensity factor in a low-carbon steel has been studied. In Stage I crack propagation depends on the microstructure of the material; in Stage II the growth rate curves for different grain sizes appear to merge together. There is a kink or a dip in the crack propagation rate where Stages I
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Application of Resistance Curves to Crack at a Hole

1983
Fracture tests have been conducted on center-cracked specimens, and specimens containing a short crack at a circular hole, made of the 2024-T351 aluminum alloy. The test results have shown that the center-cracked specimen exhibits elastic behavior, whereas the cracked hole specimens exhibit elastic-plastic behavior.
D. Shows, A. F. Liu, J. H. FitzGerald
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