Impact Fracture of Thermally Tempered Glass Helicopter Windshields |
| |
Authors: | Mahmoud M Abou el Leil Frank A Camaratta Rocco R DiGenova |
| |
Affiliation: | United Technologies Research Center, East Hartford, Connecticut 06108;Sikorsky Aircraft, Stratford, Connecticut 06602 |
| |
Abstract: | In-service fracture of helicopter windshields was studied. Simulated catastrophic fracture tests were conducted by firing alumina and steel spheres onto stationary tempered and as-received glass panels. The results were studied by Hertzian analysis and modified Auerbach's relations. Thermally tempered glass shows much higher impact resistance than that estimated from superposition of residual stresses. Subcritical impact sites exhibit slow crack growth in tempered plates, eventually leading to fracture of the entire plate. |
| |
Keywords: | |
|
|