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Relative Motion Analysis - Velocity01:24

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A stroke engine has a slider-crank mechanism that converts rotational motion from the crank into linear motion of the slider or vice versa. This mechanism consists of three main parts: the crank, the connecting rod, and the slider.
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Crack Propagation Velocity Determination by High-speed Camera Image Sequence Processing.

Frank Liebold1, Ali A Heravi2, Oliver Mosig3

  • 1Institute of Photogrammetry and Remote Sensing, TU Dresden, 01062 Dresden, Germany.

Materials (Basel, Switzerland)
|October 7, 2020
PubMed
Summary
This summary is machine-generated.

This study presents a photogrammetric method to measure crack propagation speeds in concrete using high-speed cameras. The technique accurately determines crack velocities up to 800 m/s, offering full-field, spatio-temporal insights into material damage.

Keywords:
crack analysiscrack propagation velocitydeformation measurementhigh-speed cameraimage sequence analysismaterial testing

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Photogrammetry

Background:

  • Understanding concrete damage mechanisms requires accurate measurement of crack propagation.
  • Spatiotemporal analysis of high-speed crack patterns is technically demanding.

Purpose of the Study:

  • To develop and validate a photogrammetric procedure for determining crack propagation velocities in concrete.
  • To enable full-field, spatiotemporal measurements of crack dynamics.

Main Methods:

  • A cascaded image sequence processing technique was developed.
  • Displacement vector fields were computed to identify crack patterns through deformation analysis.
  • Crack tip detection and tracking were performed using principal component analysis.

Main Results:

  • The method allows for spatiotemporally resolved, full-field measurements, unlike traditional point-wise techniques.
  • Crack widths can be simultaneously determined.
  • Validation on compact-tension specimens yielded crack propagation velocities of approximately 800 m/s with a precision of 50 m/s.

Conclusions:

  • The presented photogrammetric procedure offers a robust and precise method for analyzing high-speed crack propagation in concrete.
  • This technique enhances the understanding of concrete damage processes by providing detailed crack dynamics.