Results 251 to 260 of about 66,884 (287)

Crack opening displacement and propagation rate of microstructurally short cracks

Materials Science and Engineering: A, 2003
Crack opening displacement (COD) along the edges of microstructurally short fatigue cracks in austenitic stainless steel was investigated in situ in the SEM. The measured plastic part of the COD range between maximum and minimum load was extrapolated to the near crack tip region, assuming plastic blunting and resharpening by cooperative slip as well ...
C. Blochwitz, W. Tirschler, A. Weidner
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Crack Opening Displacement Measurements on Small Cracks in Fatigue

1988
A computerized interferometric displacement gage was used to monitor the crack mouth opening behavior of naturally initiated small fatigue cracks in the high-strength alloy Ti6Al-2Sn-4Zr-6Mo. Complete load versus crack opening displacement curves were obtained for naturally initiated semicircular cracks of surface length as small as 50 µm.
JM Larsen, JR Jira, T Weerasooriya
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Crack opening displacement and the rate of fatigue crack growth

International Journal of Fracture Mechanics, 1972
Using a direct proportionality between the rate of fatigue crack growth and crack opening displacement above a threshold, it is shown that fatigue crack growth data for a wide variety of different materials can be accurately described in terms of the mechanical properties and two material constants; the constant of proportionality A and the threshold ...
R. J. Donahue, H. McI Clark, P. Atanmo, R. Kumble, A. J. McEvily   +4 more
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Crack Growth Resistance Measurement by Crack Opening Displacement Methods

1984
In a previous investigation, tests had been conducted on compact specimens made of A508 Class 2A steel to study specimen geometry effects on JR-Curve behavior. No particular geometry effects were shown in specimens ranging in size from ½T to 10T when conditions for J-controlled growth were satisfied.
DE McCabe, HA Ernst
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Determination of Crack Bridging Stresses from Crack Opening Displacement Profiles

International Journal of Fracture, 1997
This paper discusses the development of an optimization procedure to deduce the bridging stress from the crack opening displacements (COD) measured during fatigue crack growth. Finite element analysis was conducted using the center-cracked geometry to verify the optimization procedure.
Dennis J. Buchanan, Reji John, David Alan Johnson   +2 more
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Crack Opening Displacement Design Methodology

2003
A steel structural member with a stress-concentration factor of 3 is subjected to a nomimal design stress σY/2 where σY is the yield stress of the material in tension. Using the crack opening displacement design method determine the maximum crack length the member can withstand without failure.
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J-Integral and crack opening displacement fracture criteria

1990
The mathematical formulation of conservation laws applicable in elastostatics in the form of path independent integrals of some functionals of the elastic field over the bounding surface of a closed region originates from the work of Gunther [5.1]. Some years earlier Eshelby [5.2] obtained a representation of the ‘force on an elastic singularity or ...
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Observation of crack closure using a crack mouth opening displacement gauge

International Journal of Fatigue, 1989
A crack mouth opening displacement (CMOD) gauge has been designed to estimate the crack length as well as the crack opening stress level in an automated fatigue crack propagation test programme. The CMOD gauge accurately predicts crack tip opening levels in K-controlled tests with constant K, K increasing or K decreasing.
Brahma, KK, Dash, PK, Dattaguru, B
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On the cyclic crack‐tip opening displacement

Fatigue & Fracture of Engineering Materials & Structures, 2009
ABSTRACTThis note discusses the cyclic crack tip opening displacement (CTOD)cyc. As is discussed, the correct expression for the (CTOD)cycis based upon the effective range of the stress intensity factor.
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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
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