Results 251 to 260 of about 32,098 (294)

Unified constraint parameter based on crack-tip opening displacement

Engineering Fracture Mechanics, 2018
Abstract To develop new fracture assessment methodology to incorporate both in-plane and out-of-plane constraints, it is desirable to develop unified constraint parameters convenient for engineering calculation and application. In this work, a new unified constraint parameter Ad based on crack-tip opening displacement (CTOD) was proposed, and the ...
J.Y. Xu, G.Z. Wang, F.Z. Xuan, S.T. Tu
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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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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
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Determining Fatigue Crack Opening Loads from Near-Crack-Tip Displacement Measurements

1999
The aim of this research was to develop a near-crack-tip measurement method that quantifies crack closure levels in the near-threshold fatigue crack growth regime—a regime where crack closure is not well characterized by remote compliance methods. Further understanding of crack closure mechanics was gained by performing novel crack growth experiments ...
WT Riddell, RS Piascik, MA Sutton, W Zhao, SR McNeill, JD Helm   +5 more
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The stereophotogrammetric determination of the critical crack tip opening displacement

Engineering Fracture Mechanics, 1985
Abstract The methods to determine the critical crack tip opening displacement (CODi) are discussed. Stretched zone regions are analyzed using the method of stereophotogrammetry with the scanning electron microscope. The CODi is determined on eight sections near the centre of the specimen.
O. Kolednik, H.P. Stüwe
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Crack-tip blunting and crack-opening displacement under large-scale yielding

Metal Science, 1976
AbstractThe recrystallization method, a newly developed technique for measuring plastic strain, makes it possible to observe directly the intense strain region near the crack tip. The shape of this zone and the plastic strain distribution obtained by this method are similar to the theoretical findings of Rice and Johnson.
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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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Relation Between J-Integral and Crack Tip Opening Displacement

1981
This paper describes the analysis by the finite element method, which shows the correlation between the J-integral (J) and crack tip opening displacement (CTOD). The result is that the non-dimensional J-integral ~ non-dimensional CTOD relation seems to be expressed by a single curve for various metals.
T. Miyoshi, M. Shiratori
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Crack tip opening displacement in relatively high toughness materials

Engineering Fracture Mechanics, 1991
Abstract A theoretical model of crack tip opening displacement is presented which is based on a concept of rigid body rotation near the crack tip. The proposed relation is used to obtain the crack tip opening displacement in three point bend specimens of low strength high toughness materials.
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