| 摘要 |
This aircraft windshield resistant to penetration by impact with birds has a plurality of transparent plastic sheets bonded together with flexible interlayers. The innermost sheet of the laminate is formed of a polycarbonate. A metal bearing strip is adhesively bonded to the inside face of the innermost sheet along at least one edge with the inboard edge of the bearing strip curling gradually away from the inner face of the innermost plastic sheet and with a wedge-shaped body of flexible adhesive therebetween. A row of countersunk attachment holes along the edge of the windshield extends through the transparent sheets and the bearing strip and each contains a bushing for receiving a flat head bolt for connecting the windshield to an airframe structure. The inner end of each bushing has an enlarged shoulder having a length not less than the thickness of the bearing strip for bearing on the airframe structure. In case of bird impact the windshield can flex and the bearing strip inhibits edge breakage and tearing of the windshield adjacent the attachment holes. It also assures an adequate bend radius in the plastic to prevent breakage. Broaching of the bolt heads through plastic absorbs impact energy and protects the bolts from tensile and bending failure. A shallow V-shaped edge sealant configuration is also provided.
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