Damage to polymer-coated glass surfaces by small-particle impact

Mohammad Munawar Chaudhri; Alan L. Smith

doi:10.1117/12.23940

1 April 1991 Damage to polymer-coated glass surfaces by small-particle impact

Mohammad Munawar Chaudhri, Alan L. Smith

Proceedings Volume 1358, 19th Intl Congress on High-Speed Photography and Photonics; (1991) https://doi.org/10.1117/12.23940
Event: 19th International Congress on High-Speed Photography and Photonics, 1990, Cambridge, United Kingdom

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.

Citation Download Citation

Mohammad Munawar Chaudhri and Alan L. Smith "Damage to polymer-coated glass surfaces by small-particle impact", Proc. SPIE 1358, 19th Intl Congress on High-Speed Photography and Photonics, (1 April 1991); https://doi.org/10.1117/12.23940

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