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Proceedings Paper

Damage to polymer-coated glass surfaces by small-particle impact
Author(s): Mohammad Munawar Chaudhri; Alan L. Smith
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Paper Abstract

A high speed photographic investigation of the impact damage processes of soda-lime glass surfaces coated with thin layers of a self adhesive tape and polyurethane rubber has been described. The impacting particles were 1-mm steel spheres and had velocities in the range of 50-250 ms1. The photography was performed at a framing rate of 1 million per second. It is shown that, depending upon the impact velocities, the coatings debonded and perforated by the impact and therefore they provided very little protection to the coated surface. The coatings also tended to adhere to the projectile and during its rebound this caused tensile stresses normal to the impacted surface. Additional tensile stresses during the projectile rebound were caused by the rapid contraction of the piled up coating. These stresses are probably responsible for the enhanced growth of the lateral cracks in the coated glass surfaces. The coatings, however, reduced the amount of jetting' of the fragmented material and the removal of the surface chips developed during unloading.

Paper Details

Date Published: 1 April 1991
PDF: 7 pages
Proc. SPIE 1358, 19th Intl Congress on High-Speed Photography and Photonics, (1 April 1991); doi: 10.1117/12.23940
Show Author Affiliations
Mohammad Munawar Chaudhri, Univ. of Cambridge (United Kingdom)
Alan L. Smith, Univ. of Cambridge (United Kingdom)

Published in SPIE Proceedings Vol. 1358:
19th Intl Congress on High-Speed Photography and Photonics
Peter W. W. Fuller, Editor(s)

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