Abstract
In service impact fracture of helicopter windshields show evidence of impacts with small hard projectiles. 3-D computer analysis confirmed that impacts are caused by levitated sand particles which acquire high momemtum after collision with the rotor. In-service impacts were simulated by firing spherical projectiles at fixed annealed, thermally and chemically tempered windhield panels. Hertzian stress analysis and modified Auerbach’s relations were used to study the results. Deviations from Auerbach’s relations are believed to be caused by differences in surface crack distribution among different glass groups. A relation, which takes crack distribution into account, was derived by applying fracture mechanics to the case of the Hertzian impact. Experimental results agree better with the new relation than with the modified Auerbach’s law.
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© 1986 Plenum Press, New York
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Abou-el-leil, M.M., Camaratta, F.A., DiGenova, R.R. (1986). Hertzian Impact Fracture Test for Helicopter Windshields. In: Bradt, R.C., Evans, A.G., Hasselman, D.P.H., Lange, F.F. (eds) Fracture Mechanics of Ceramics. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-7023-3_15
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DOI: https://doi.org/10.1007/978-1-4615-7023-3_15
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