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Effect of Polyurethane Foam on the Energy Management of Structural Components
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 06, 2000 by SAE International in United States
Annotation ability available
Event: SAE 2000 World Congress
The effect of polyurethane structural foam on strength, stiffness, and energy absorption of foam filled structural components is investigated to formulate design directions that may be used in weight reduction and engineering functions of vehicle systems.
An experimental/testing approach is first utilized using Taguchi’s DOE to identify design variables [foam density, gage, and material type], that are needed to determine the weight/performance ratio of structural hat-section components. An analytical CAE approach is then used to analyze the hat-section components using non-linear, large deformation finite element analysis. An accepted level of confidence in the CAE analytical tools is then established based on comparison of results between the two approaches. Upon that, the CAE analytical tools are deployed in a sensitivity study to quantify crush/crash characteristics of foam-filled hat-section components with respect to the changes in the design variables; namely, foam density, gage, and steel material strength. Design charts are then generated for a spectra of design variables aimed at particular applications in order to help establish the weight effectiveness of foam filling.
Increasing the gage from 0.65 to 1.0 mm will increase energy absorption, but it will be accompanied by significant weight increase thus reducing the effectiveness of foam. Therefore, the use of thin gages accompanied by foam fillings in the 5 to 9 pcf range would result in efficient energy absorbing structural components. Strength and energy absorption can also be increased with no weight penalty, by changing the material type from mild to high strength steel.
The peak and mean loads (strength) of columns and beams increased by foam-filling, is due to a delayed local buckling mechanism. On the other hand, foam usage in beams requires a trade-off in density and location, where plastic hinges are likely to form. This trade-off in location will help minimize the total weight of the component thus maximizing the total specific energy gain per that member.
CitationAlwan, J., Wu, C., and Chou, C., "Effect of Polyurethane Foam on the Energy Management of Structural Components," SAE Technical Paper 2000-01-0052, 2000, https://doi.org/10.4271/2000-01-0052.
SAE 2000 Transactions Journal of Passenger Cars - Mechanical Systems
Number: V109-6 ; Published: 2001-09-15
Number: V109-6 ; Published: 2001-09-15
- Porsche, Porsche Engineering Services, Inc., DN5 Lightweight Study, Final Report, March 30, 1993
- Bores,A. P. and Sidebottom,O. M., “Advanced Mechanics of Materials”, 3rd Edition, 1978, John Wiley and Sons, New York, pp.670.
- Mahmood, H. F., and Paluszny, A., “Design of Thin Wall Columns for Crash Energy Management-Their Strength and Mode of Collapse”, TransactionsSAE, 90, 4039, 1981.
- Abed, S. H., and Doane, R. M., “An Analytical Approach To Predict Maximum Bending Strength of Thin-Walled Beams Composed of High and Mild Strength Steel”, Technical Report No. ASE-93-04, Ford Motor Company, Alpha Simultaneous Engineering, May, 1993.
- Lampinen, B. E., and Jeryan, R. A., “Effectiveness of Polyurethane Foam in Energy Absorbing Structures”, Technical Report No. SR-82-55, Ford Motor Company, May, 1982.
- Thornton, P. H., “Energy Absorption by Foam Filled Structures”, SAE Technical Paper Series, Congress and Exposition, Detroit, Feb., 1980.
- Montgomery, D. C., and Analysis of Experiments, New York, John Wiley and Sons, 1991.
- Walpole, R. E., and Raymond, H. M., Probability and Statistics for Engineers and Scientists, 4th Edition, New York, Macmillan Publishing Company, 1989.
- LS-DYNA3D Users Manual, Livermore Software Technology Corportion, 1994.
- Lilley, K., and Mani, A., “Roof-Crush Strength Improvement Using Rigid Polyurethane Foam”, SAE, Topics in Vehicle Safety Technology, SP-1139, Feb. 1996, pp. 35-45.
- Chou, C. C., Zhao, Y., Lim, G. G., Patel, R., Shahab, S., and Patel, P., ”Comparative Analysis of Different Energy Absorbing Materials for Interior Head Impact”, SAE paper No. 950332, 1995.
- Bilkhu, B. B., Founas, M., Nusholtz, G. S., and Du Bois, P., “Techniques fo Numerical Modelling of Cellular Materials using Material Models #5, #10, #41 in LS-DYNA3D”, The Second International LSDYNA3D Conference held in San Francisco, September 20-21, 1994. Paper No. 2IL - SD3D104.
- Chang, F.S., Hallquist, J. O., Lu, D.X., Shahidi, B. K.,Kudelko, C. M., and Tekelly,J. P., “Finite Element Analysis of Low-Density High-Hysteresis Foam Materials and the Application in the Automotive Industry”, SAE Paper 940908, 1994.