This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Design of Temperature Insensitive Ribs for Crash Test Dummies
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 03, 2003 by SAE International in United States
Annotation ability available
The Isodamp damping material (also known as Navy Damp) used in the ribs of current crash test dummies provides human-like damping to the thorax under impact. However, the range of temperature over which it can be used is very small. A new rib design using laminates of steel, fiberglass, and commercially available viscoelastic material has been constructed. Load-deflection response and hysteresis of the laminated ribs were compared with corresponding conventional ribs fabricated from steel and Isodamp. Impact tests were conducted on laminated and conventional ribs at 18.5° C, 22.2° C and 26.6° C. Results indicate that the response of the laminated ribs is essentially the same as that of the ribs with Isodamp at 22.2° C, which is the operating temperature of the conventional ribs. The variation in the impact response of the newly developed laminated ribs in the temperature range of 18.5° C to 26.6° C was less than 10%. The variation was well within the allowed reproducibility range, and significantly less than the 30-40% variation seen with the Isodamp material. Repeated impact tests indicate that the new laminate construction is generally robust and provides repeatable response. FE modeling was used to predict the properties of alternative materials needed to provide adequate damping over the required range of temperature. Damping properties of various materials were evaluated using cantilever beam tests followed by single rib tests of most promising materials. This paper will present details on the design, development, and testing of the new laminate rib.
CitationShams, T., McDonald, J., Rangarajan, N., Haffner, M. et al., "Design of Temperature Insensitive Ribs for Crash Test Dummies," SAE Technical Paper 2003-01-0502, 2003, https://doi.org/10.4271/2003-01-0502.
SAE 2003 Transactions Journal of Passenger Cars - Mechanical Systems
Number: V112-6 ; Published: 2004-09-15
Number: V112-6 ; Published: 2004-09-15
- Bell, S.C., Collins, J.A. and Guenther. D.A. 1984. Preliminary Design of an Enhanced Hybrid III Thorax. NHTSA Contract No. DTNH22-83-a- 07279.
- EAR Technical Data Sheet. 1998. Isodamp CN.
- Finnegan, I.C., and Gibson. R.F. 1999. Recent Research on Enhancement of Damping in Polymers. Composite Structures, Volume44, pp 89-98.
- Gibson, R.F. and Zhao. H. 1999. Improvement in Damping Capacity and Fracture Toughness in Composite Laminates by the Use of Polymeric Interleaves. Proceedings of ASME, NCA Volume26, pp 333-343.
- Haffner, M., et al. 2001. Foundations and Elements of the NHTSA THOR Alpha ATD Design. Paper # 458 in 17th International Technical Conference on the Enhanced Safety of Vehicles. HS 809 220, (U.S. DOT, 2001).
- Hibbit, Karlsson, and Sorensen, Inc. 1997. ABAQUS Theory Manual, Version 5.7.
- Melvin, J., King, A., Alem, N. 1985. AATD System Technical Characteristics, Design Concepts, and Trauma Assessment Criteria. Task E-F, Final Report, DOT Contract No. DTNH22-83-C-07005.
- Neathery, R. 1974. Analysis of Chest Impact Response Data and Scaled Performance Recommendations. SAE Paper No. 741188.
- Ore, L. and Saul. R. 1993. Composite Rib Development. VRTC Report VRTC-88-0084.
- Rangarajan, N. 1998. Design Criteria, Design, and Performance of the Thor Advanced Frontal Crash Test Thorax and Abdomen Assemblies. 16th ESV Conference, 1998.
- Saul, R.A. 1984. State of the Art Dummy Selection. NHTSA Report Number DOT HS 806 22.
- Thomson, W. 2000. Theory of Vibrations with Applications. Fourth Ed. Stanley Thornes Pub.
- White, R.P., Rangarajan, N., and Haffner, M., 1996. Development of the Thor Advanced Frontal Crash Test Dummy. Proc. SAFE Conference..
- 3M Technical Data Sheet, 1999. 3M Viscoelastic Damping Polymers 110, 112, 130. 3M Bonding Systems Division.