Results 221 to 230 of about 2,817 (257)

The distribution of strain within crack tip plastic zones

Engineering Fracture Mechanics, 1986
Abstract Strains ahead of cracks both growing due to cyclic loading and loaded only in tension, as experimentally determined using the stereoimaging technique, have been used to derive equations for the strain distribution. Both logarithmic and power function relations were fitted to the strains and the logarithmic function was found to be the best ...
openaire   +1 more source

Plane strain deformations of locking materials near a crack tip

Engineering Fracture Mechanics, 1994
Abstract Plane-strain deformations of an isotropic and homogeneous Hookean body containing a crack are studied and it is required that the dilatation everywhere in the body be greater than or equal to a constant. Following Prager, the region where the dilatation always equals the constant is identified as the locking region.
C.Q. Ru, R.C. Batra
openaire   +1 more source

An alternative to the Shoji crack tip strain rate equation

Corrosion Science, 2008
Abstract Fundamentally derived crack tip strain rate (CTSR) equations are being sought for use in modelling stress corrosion crack growth. The CTSR equation derived by Shoji and coworkers is gaining prominence in modelling the effects of cold work on stress corrosion cracking of nuclear reactor materials due to an ability to model the effects of ...
openaire   +1 more source

Crack-tip stresses as computed from strains determined by stereoimaging

Experimental Mechanics, 1983
Measurements of the three in-plane elements of the strain tensor near a crack tip have been combined with the material constitutive behavior to compute the three inplane elements of the stress tensor and the mean stress. The method is illustrated with fatigue-crack plasticity results for 7075-T651 aluminum alloy.
D. L. Davidson, D. R. Williams, J. E. Buckingham   +2 more
openaire   +1 more source

A measurement of three-dimensional strains around a creep-crack tip

Experimental Mechanics, 1992
A new method for measuring the strain around the high-temperature creep-crack tip is proposed in the present paper. A grid pattern was described in a space of about 30 μm with a diamond stylus in the area ahead of the precrack of the specimen. Then, the distortion of the grids and the change in specimen thickness which were induced by the creep ...
K. Hatanaka, T. Fujimitsu, H. Inoue
openaire   +1 more source

Blunting of a Plane Strain Crack Tip Into a Shape With Vertices

Journal of Engineering Materials and Technology, 1977
When monotonically increasing tensile opening loads are applied to a cracked, plane strain, elastic-plastic body, the crack tip will blunt until fracture occurs. At least within the rigid-plastic model for nonhardening material, the shape of the blunted tip is not unique.
openaire   +1 more source

On the asymptotics of the stress and strain fields near a crack tip

Mechanics of Solids, 2009
The problem is solved under the plane strain conditions for a crack of general form, which in general is neither a mode I nor a mode II crack. We assume that the strains are small and the material is nonlinearly elastic. The mathematical statement of the problem is reduced to the eigenvalue problem for a system of ordinary nonlinear differential ...
openaire   +1 more source

Direct measurement of microscopic strain distribution near a crack tip

Experimental Mechanics, 1996
A dot map method was used for direct measurement of the microscopic strain field near a crack tip in a rubber-toughened epoxy. Results indicate that very large viscoelastic strains (37 percent) are present at the crack tip, though elongation in a tensile test is only 5.1 percent.
S. Yongqi, C. Corletto, W. L. Bradley, J. Tian   +3 more
openaire   +1 more source

Measurements of strains near a growing fatigue crack tip

Materials Science and Engineering, 1984
Abstract In a mode I propagating fatigue crack an empirical relationship between the horizontal distance X from the crack tip and the strain range Δϵ YY of the local hysteresis loop was obtained for 14 steels and aluminum alloys with various heat treatments: δϵ YY ={2.63(mean)±(standard deviation)}X×10 −1 δK E X −0.54 ...
openaire   +1 more source

First direct measurements of transformation strains in crack-tip zone

Second International Conference on Photomechanics and Speckle Metrology: Speckle Techniques, Birefringence Methods, and Applications to Solid Mechanics; Moiré Techniques, Holographic Interferometry, Optical NDT, and Applications to Fluid Mechanics, 1991
Computer automated high-accuracy strain-field mapper (HASMAP) was used to measure strains responsible for crack tip shielding in partially stabilized zirconia containing 9% MgO (Mg-PSZ). HASMAP is used to determine the strain fields from the measured displacement fields by cross-correlation analysis of the relative positions of visible surface texture ...
David B. Marshall, Winfred L. Morris, Mahyar S. Dadkhah   +2 more
openaire   +1 more source