Results 251 to 260 of about 3,593 (294)

Dynamic Measurement of Crack-Tip Opening Displacement

1988
Crack opening displacements were measured at two positions very close to the tip of a crack in three-point bend specimens that were loaded explosively. Indentations were placed across the fatigue precrack at locations 100 μm and 200 μm behind the tip. These indentations, when illuminated with a laser, generate fringe patterns in space, and the motion ...
WN Sharpe, Z Waclawiw, AS Douglas
openaire   +1 more source

Calculation of the crack tip opening displacement of a crack lying in a subsurface layer

Journal of Applied Physics, 1985
Crack tip opening displacement of a crack lying parallel to a free surface is calculated by counting the number of dislocations emitted into the plastic zone from a crack tip. A discrete dislocation model was used to simulate the crack, while varying the strength of dislocations so as to satisfy the boundary condition.
Y. Higashida, K. Kamada
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Critical Crack-Tip Opening Displacement of SCLC

2018
The aim of this study is to consider the effects of water/binder ratio on fracture behavior of self-compacting lightweight concrete (SCLC). To do so, four mixes with constant nominal size of aggregate (d a = 12.5 mm) have been prepared such that the weight of aggregate and portion of coarse aggregate to fine aggregate were designed to be constant ...
Moosa Mazloom, Mohammad Karamloo
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Fatigue crack propagation under programmed loads and crack tip opening displacements

Engineering Fracture Mechanics, 1970
Abstract A fatigue crack propagation model relating fatigue crack growth rates to crack tip opening displacements is evaluated in the case of two tests under programmed loads with a peak overload every 200 cycles. It is shown that the relative amount of crack extension produced by different load amplitudes can be related to the relative crack tip ...
J.C. McMillan, R.M. Pelloux
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A novel crack growth equation based on crack tip opening displacement variation

57th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, 2016
The crack tip opening displacement (CTOD) plays an important role in fatigue damage evaluation. An analytical approximation is employed in this paper to calculate the CTOD variation, which is inspired from the scanning electron microscopy (SEM) experiment.
Shan Jiang, Wei Zhang, Zili Wang
openaire   +1 more source

An assessment of the crack tip opening displacement criterion for predicting creep crack growth

International Journal of Fracture, 1996
From a set of finite element (FE) simulations of creep crack growth in compact tension specimens, the critical value of the crack tip opening displacement, CTOD, for creep crack growth has been generated for a Ni-base superalloy (Waspaloy) at 700°C.
L. Xia, T. H. Hyde, A. A. Becker
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Measurement of Crack Tip Opening Displacement of Paper

Journal of Packaging Science & Technology, Japan, 2000
Crack opening displacement (COD) on double edge notched (DEN), single edge notched (SEN) and center notched (SCN) specimens with various crack length was quantitatively analyzed by using video-microscopy for a machine-grazed paper. A linear relationship appears between COD and the distance from the crack tip throughout the testing period for all ...
Takagi, Kazuyoshi, Tanaka, Atsushi, Yamauchi, Tatsuo   +2 more
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Crack tip opening and advance displacements of blunted cracks under plane stress

Journal of Materials Science, 1991
The phenomenon of ductile blunting under plane stress conditions in cracked polycarbonate plates was studied. Because this phenomenon is intimately connected with the amount of crack opening displacement (CTOD) and its analogous phenomenon of crack tip advance displacement (CTAD), a study was undertaken of the mechanism of the development of blunting ...
P. S. Theocaris, V. Kytopoulos
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Embedded Crack Tip Opening Displacement Sensor for Concrete

2005
Development of a fiber optic sensor (FOS) for embedment in concrete is described. The sensor transduction mechanism is based on the measurement of the normalized intensity variation of the speckle pattern (SIV) generated at the output end of the optical fiber. The fiber optic sensors with different gauge lengths were calibrated with the cantilever beam
Zhijun Zhang, Farhad Ansari
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Prediction of crack tip opening displacement of fibre composites

Engineering Fracture Mechanics, 1992
Abstract The fracture behaviour of single edge notched unidirectional glass fibre reinforced epoxy resin composites under tensile loading was investigated. Load-elongation curves were obtained for crack length varying from 4, 6, 8, 10 and 12mm and different fibre volume fractions of 0.48, 0.502 and 0.525.
openaire   +1 more source