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Structural Design Strategies for Improved Small Overlap Crashworthiness Performance
Technical Paper
2014-22-0006
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English
Abstract
In 2012, the Insurance Institute for Highway Safety (IIHS) began a 64 km/h small overlap frontal crash test consumer information test program. Thirteen automakers already have redesigned models to improve test performance. One or more distinct strategies are evident in these redesigns: reinforcement of the occupant compartment, use of energy-absorbing fender structures, and the addition of engagement structures to induce vehicle lateral translation. Each strategy influences vehicle kinematics, posing additional challenges for the restraint systems. The objective of this two-part study was to examine how vehicles were modified to improve small overlap test performance and then to examine how these modifications affect dummy response and restraint system performance. Among eight models tested before and after design changes, occupant compartment intrusion reductions ranged from 6 cm to 45 cm, with the highest reductions observed in models with the largest number of modifications. All redesigns included additional occupant compartment reinforcement, one-third added structures to engage the barrier, and two modified a shotgun load path. Designs with engagement structures produced greater glance-off from the barrier and exhibited lower delta Vs but experienced more lateral outboard motion of the dummy. Designs with heavy reinforcement of the occupant compartment had higher vehicle accelerations and delta V. In three cases, these apparent trade-offs were not well addressed by concurrent changes in restraint systems and resulted in increased injury risk compared with the original tests. Among the 36 models tested after design changes, the extent of design changes correlated to structural performance. Half of the vehicles with the lowest intrusion levels incorporated aspects of all three design strategies. Vehicle kinematics and dummy and restraint system characteristics were similar to those observed in the before/after pairs. Different combinations of structural improvement strategies for improving small overlap test performance were found to be effective in reducing occupant compartment intrusion and improving dummy kinematics in the IIHS small overlap test with modest weight increase.
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Authors
Topic
Citation
Mueller, B., Brethwaite, A., Zuby, D., and Nolan, J., "Structural Design Strategies for Improved Small Overlap Crashworthiness Performance," SAE Technical Paper 2014-22-0006, 2014, https://doi.org/10.4271/2014-22-0006.Also In
References
- Brumbelow , M. , and Zuby , D. 2009 Impact and injury patterns in frontal crashes of vehicles with good ratings for frontal crash protection Proc. 21st International ESV Technical Conference [book on CD-ROM] National Highway Traffic Safety Administration Washington, DC
- Fuji Heavy Industries 2014 Subaru 14MY Forester: Concept of Small Overlap Collision May 2014 Tokyo, Japan
- Insurance Institute for Highway Safety 2004 Guidelines for using the UMTRI ATD positioning procedure for ATD and seat positioning (ver. V) Arlington, VA
- Insurance Institute for Highway Safety 2012a Small overlap frontal crashworthiness evaluation crash test protocol (ver. II) Arlington, VA
- Insurance Institute for Highway Safety 2012b Small overlap frontal crashworthiness evaluation rating protocol (ver. II) Arlington, VA
- Jakobsson , L. , McInally , G. , Axelson , A. , Lindman , M. , Kling , A. , Broberg , T. , Fermér , M. , and Wågström , L. 2013 Severe frontal collisions with partial overlap: two decades of car safety development SAE Technical Paper 2013-01-0759 SAE International Warrendale, PA
- Kuehn , M. , Hummel , T. , and Bende , J. 2013 Small Overlap Frontal Impacts Involving Passenger Cars in Germany Proc. 23rd International ESV Technical Conference [book on CD-ROM] National Highway Traffic Safety Administration Washington, DC
- Lindquist , M. , Hall , A. , and Björnstig , U. 2004 Car structural characteristics of fatal frontal crashes in Sweden International Journal of Crashworthiness 9 587 597
- Mueller , B. , Sherwood , C. , Nolan , J. , and Zuby , D. 2013 Repeatability of the IIHS small overlap frontal crash test Proc. 23rd International ESV Technical Conference [book on CD-ROM] National Highway Traffic Safety Administration Washington, DC
- Ohnaka , R. 2013 2013 Honda Accord: NVH collision safety Proc. International Automotive Body Congress 2012 136 151 Curran Associates Inc. Red Hood, NY
- Planath , I. , Norin , H. , and Nilsson , S. 1993 Severe frontal collisions with partial overlap: significance, test methods, and car design SAE Technical Paper 930636 SAE International Warrendale, PA
- Prasad , P. , Dalmotas , D. , and German , A. 2014 An examination of crash, and NASS data to evaluate the field relevance of IIHS small overlap tests SAE Government Industry Meeting (oral presentation only) January 23 Washington, DC
- Rudd , R. , Bean , J. , Cuentas , C. , Kahane , C. , Mynatt , M. , and Wiacek , C. 2009 A study of the factors affecting fatalities of air bag and belt-restrained occupants in frontal crashes Proc. 21st International ESV Technical Conference [book on CD-ROM] National Highway Traffic Safety Administration Washington, DC
- Samaha , R. , Prasad , P. , and Nix , L. 2013 Opportunities for injury reduction in US frontal crashes: an overview by structural engagement, vehicle class, and occupant age Stapp Car Crash Journal 57 441 467
- Scullion , P. , Morgan , R. , Mohan , P. , Kan , C. , Shanks , K. , Jin , W. , and Tangirala , R. 2010 A reexamination of the small overlap frontal crash Proc. 54th Annual AAAM Conference 137 148 Association for the Advancement of Automotive Medicine Des Plaines, IL
- Sherwood , C. , Nolan , J. , and Zuby , D. 2009 Characteristics of small overlap crashes Proc. 21st International ESV Technical Conference [book on CD-ROM] National Highway Traffic Safety Administration Washington, DC
- Thomas , C. 2012 The role of the vehicle structure in reducing injuries in small overlap crashes Proc. International Automotive Body Congress 2011 62 70 Curran Associates Inc. Red Hood, NY
- Weissler , P. 2013 2014 MDX re-engineered to pass IIHS test, reduce NVH Automotive Engineering Magazine June 07 http://articles.sae.org/12225/ SAE International Warrendale, PA