Experimental and numerical study on the unstable crack growth under uniaxial compression

T. Okinaka; L. Wijerathne

doi:10.1117/12.2271075

20 February 2017 Experimental and numerical study on the unstable crack growth under uniaxial compression

T. Okinaka, L. Wijerathne

Proceedings Volume 10328, Selected Papers from the 31st International Congress on High-Speed Imaging and Photonics; 103281M (2017) https://doi.org/10.1117/12.2271075
Event: 31st International Congress on High-Speed Imaging and Photonics, 2016, Osaka, Japan

Abstract

Image analysis with ultra-high-speed camera and two dimensional dynamic numerical analysis are applied to study the rapid unstable growth of wing crack under the uniaxial compression. Growing wing crack terminates and restarts its unstable rapid growth in some cases. Such a termination and restart behavior of the growing crack is studied through the experiment and numerical analysis in this work. First, rectangle transparent specimen, including the initial crack inclined to the compressive axis, is subjected to the uniaxial compression till the wing cracks start unstable rapid growth from both ends of the initial crack. Images of growing cracks and those of stress distribution, visualized as the photo-elastic fringe pattern, are captured by the high speed camera with the frame rate of 500k frames per second. The behavior of growing crack and the change in the stress field due to the crack growth are discussed through the captured images. Next, two dimensional dynamic numerical analysis is carried out. PDS-FEM (Particle Discretization Scheme), which allows the discontinuity of the displacement in the continuous analytical domain, is combined with the central difference time integration scheme to simulate the rapid unstable growth of the wing crack dynamically. The accuracy of the proposed simulation is discussed through the comparison with the images, captured by the experiment.

Citation Download Citation

T. Okinaka and L. Wijerathne "Experimental and numerical study on the unstable crack growth under uniaxial compression", Proc. SPIE 10328, Selected Papers from the 31st International Congress on High-Speed Imaging and Photonics, 103281M (20 February 2017); https://doi.org/10.1117/12.2271075

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KEYWORDS

Fringe analysis

Image visualization

Cameras

Numerical analysis

High speed cameras

Image compression

Visualization

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