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Low Velocity Impacts and Temperature Sensitivity of Automotive Windshields
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English
Abstract
Headform impacts at 5.5-7.7 mph using the 22 lb air-stabilized missile were run on glass panels that did not fracture to measure deceleration pulses and obtain Severity Index (SI) values. These tests show low SI values for this range of impact velocities. Dummy-windshield tests were run at speeds of 8.7-21.9 mph to measure SI and laceration. In all cases laceration is low and SI values do not indicate concussive hazard below approximately 15 mph impact velocity even when the glass does not fracture. These data are of particular interest for those accident situations below the probable velocity for deployment of a passive restraint such as the air bag.
The currently used HPR interlayer for automotive windshields shows excellent safety performance at room temperature but is less effective at other temperatures. Impact studies of several glass structures at 30-110 F are presented for 0.030 and 0.037 in. thickness HPR interlayers. A simulated dashboard is included in the dummy-windshield impact tests. Extensive HPR interlayer rupture occurs at 30 and 110 F, producing greater laceration hazard. These data indicate that an improvement in temperature performance is desirable providing other safety performance characteristics are retained.
THE AUTOMOBILE WINDSHIELD continues to be of concern in the vehicle design for motorist safety in crashes. While a new and significantly improved safety windshield was introduced with our domestic 1966 model vehicles, the search continues to expand our performance data and identify modifications that overcome the deficiencies of this improved windshield. This report covers data on impact performance to 35 mph for flat panels using the 5 lb steel ball and 22 lb headform and windshields using a 50th percentile anthropomorphic dummy over the 30-110 F temperature range.
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Authors
Citation
Rieser, R., Chabal, J., and Lewis, C., "Low Velocity Impacts and Temperature Sensitivity of Automotive Windshields," SAE Technical Paper 710869, 1971, https://doi.org/10.4271/710869.Also In
References
- Rieser R. G. Chabal J. “Laboratory Studies on Laminated Safety Glass and Installations on Performance.” Proceedings of Thirteenth Stapp Car Crash Conference paper 690799 New York Society of Automotive Engineers, Inc. 1969
- Rieser R. G. Chabal J. “Safety Performance of Laminated Glass Structures.” Paper 700481 SAE Mid-Year Meeting Detroit May 1970
- Patrick L. M. Daniel R. P. “Comparison of Standard and Experimental Windshields.” Proceedings of Eighth Stapp Car Crash Conference Detroit Wayne State University 1964
- Widman J. C. “Recent Developments in Penetration Resistance Windshield Glass.” SAE Transactions 74 1966 paper 650474
- Siegel A. W. Nahum A. M. “Automobile Collision and the Effect of the New U.S.A. Standards” Conference on Road Safety Brussels 1968