Results 141 to 150 of about 31,412 (196)

Displacement Fields Around a Crack Tip in Polymers

International Journal of Fracture, 1997
Moire interferometry was utilized to experimentally determine displacement fields around a crack tip in single-edge-cracked tensile PMMA and PA6/PPE/SBS alloy specimens. Vertical displacement v was expressed as functions of distance r and angle θ from the crack tip, and compared with the approximate solution of linear elastic fracture mechanics to ...
K. Arakawa, K. Takahashi
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Measurement of crack tip displacement field using laser speckle photography

Engineering Fracture Mechanics, 1988
Abstract It is shown how double exposure laser speckle photography, when used with an automatic image processing system, can provide detailed information on both in-plane displacement components around the tip of a crack. This paper describes the results of the analysis of six speckle photographs of sharp cracks in polymethylmethacrylate (PMMA), each
J.M. Huntley, J.E. Field
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Locating the Crack Tip Using Displacement Field Data: A Comparative Study

Strain, 2012
Abstract:  The evaluation of stress intensity factors from experimentally determined crack‐tip stress or displacement fields almost always requires that the location of the crack tip is identified beforehand. In this work, a study has been performed to compare how different methods to locate the crack‐tip position from the displacement field around a ...
M. Zanganeh, P. Lopez‐Crespo, Y. H. Tai, J. R. Yates   +3 more
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Measurement of dynamic crack tip displacement field by speckle photography and interferometry

Optics and Lasers in Engineering, 1993
Abstract Speckle interferometry has been used to measure the transient displacement field around a crack due to stress wave loading. Double exposure interferograms are recorded with a pulsed ruby laser, and correlation fringes formed by spatial filtering of the developed film.
J.M. Huntley, L.R. Benckert
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Measurement of displacement field around a crack tip using fractal correlation method

SPIE Proceedings, 2003
The key problem to enhance the precision of displacements measurement with image correlation is to make the most of correlation behavior of speckle images. In fact, the artificial random speckles or natural texture, especially the microcosmic texture, on the object's surface have fractal characteristics, and the digital images of these patterns are ...
Zhende Hou, Yuwen Qin, Lianyun Xiu
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Measurement of Crack Tip Displacement Fields in Mixed Mode I–Mode III Fracture

Journal of the American Ceramic Society, 1988
A new method has been devised to propagate stable subcritical mixed mode I–mode III cracks in soda–lime–silicate and borosilicate glasses. The mode I content was measured using an original optical tunneling technique and mode III content via multiple‐beam interferometry.
David A. Tossel, Kenneth H. G. Ashbee
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Crack-tip-opening-displacement-based description of three-dimensional elastic-plastic crack border fields

Engineering Fracture Mechanics, 2020
Abstract Characterization of elastic-plastic crack-tip fields has been great developed in the framework of the classical dominating parameter J-integral, which has a limit of the basic assumptions of small deformation and simple proportional loading.
Pengfei Cui, Wanlin Guo
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