Abstract
A high speed photographic (106 frames per second) study has been made of the damage caused to soda-lime and borosilicate glasses by the impact of 1mm diameter glass and steel spheres travelling at speeds up to 300ms-1. For velocities up to 180ms-1, in both glasses the cone and radial cracks formed during loading and lateral cracks during unloading. At higher speeds the cone crack was not observed to form in the soda-lime glass whereas in the borosilicate glass the cone crack formed up to the maximum velocity studied.
The threshold velocity for the formation of lateral cracks in both glasses was found to be in the range 100 – 120ms-1 for both glass and steel spheres. Lateral cracks are shown to form without any evidence of plastic flow in the glasses.
Contact times have been obtained from the photographic sequences and found to agree with the quasi-static theories.
Finally, the possible mechanisms for the formation of radial and lateral cracks are discussed.
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© 1978 Plenum Press, New York
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Chaudhri, M.M., Walley, S.M. (1978). A High-Speed Photographic Investigation of the Impact Damage in Soda-Lime and Borosilicate Glasses by Small Glass and Steel Spheres. In: Bradt, R.C., Hasselman, D.P.H., Lange, F.F. (eds) Flaws and Testing. Fracture Mechanics of Ceramics, vol 3. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-7017-2_20
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DOI: https://doi.org/10.1007/978-1-4615-7017-2_20
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