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Fatigue crack propagation under programmed loads and crack tip opening displacements
Engineering Fracture Mechanics, 1970Abstract 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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Dynamic Measurement of Crack-Tip Opening Displacement
1988Crack 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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On the cyclic crack‐tip opening displacement
Fatigue & Fracture of Engineering Materials & Structures, 2009ABSTRACTThis 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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Relationship between notch tip strain and crack-opening displacement
Materials Science and Engineering, 1980Abstract A model is proposed for strain associated with smooth blunting of a notch under mode I type of loading. The model yields a relationship between notch tip strain and crack-opening displacement. The predictions of the model were found to be in good agreement with Robinsons and Tetelman's experimental data on A533-B steel.
R.C. Bates, A.T. Santhanam
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Critical Crack-Tip Opening Displacement of SCLC
2018The 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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Critical crack tip opening displacement of different strength concrete
Journal of Central South University, 2011Critical crack tip opening displacement (CTOD(subscript c)) of concrete using experimental and analytical evaluation with seven different compressive strengths ranging from 30 up to 150 MPa was studied based on two types of fracture tests: three-point bending (TPB) and wedge splitting (WS).
Bing Wang +3 more
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Unified constraint parameter based on crack-tip opening displacement
Engineering Fracture Mechanics, 2018Abstract 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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Fiber-optic crack-tip opening displacement sensor for concrete
Cement and Concrete Composites, 1997Abstract The development of a fiber-optic sensor for embedment in cementitious composites and measurement of displacements associated with the opening of microcracks are described. The sensor can be employed as a transducer for measurement of crack-tip opening displacements during fracture tests.
Insang Lee +3 more
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Embedded Crack Tip Opening Displacement Sensor for Concrete
2005Development 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, 2016The 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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