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The Effect of Crash Severity and Structural Intrusion on ATD Responses in Rear-End Crashes
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 14, 2020 by SAE International in United States
This content contains downloadable datasetsAnnotation ability available
This study assesses vehicle and occupant responses in six vehicle-to-vehicle high-speed rear impact crash tests conducted at the Exponent Test and Engineering Center. The struck vehicle delta Vs ranged from 32 to 76 km/h and the vehicle centerline offsets varied from 5.7 to 114 cm.
Five of the six tests were conducted with Hybrid III ATDs (Anthropometric Test Device) with two tests using the 50th male belted in the driver seat, one test with an unbelted 50th male in the driver seat, one test with a 95th male belted in the driver seat, and one with the 5th female lap belted in the left rear seat. All tests included vehicle instrumentation and three tests included ATD instrumentation. The ATD responses were analyzed and compared to corresponding IARVs (injury assessment reference values). Ground-based and onboard vehicle videos were synchronized with the vehicle kinematic data and biomechanical responses.
The timing of the vehicle crush, occupant compartment intrusion, seatback motion, and ATD kinematics were assessed. The results indicated that the rear structures of the struck vehicle were significantly crushed by the striking vehicle with override contributing to the overall level of crush. In the three crashes with the front seat ATD, the intrusion of the second-row seat structure first supported and then displaced the driver seat back forward, affecting the ATD dynamics. The driver ATD neck forces exceeded the IARVs in the two tests with ATD instrumentation. In one test, the maximum neck loading occurred around 200 ms, which coincided with the ATD response from the second-row being displaced forward into the driver seatback.
In the test with the unbelted ATD, a rigid support structure was used to limit the driver seatback rearward rotation to 45 degrees from vertical. The ATD initially moved rearward and loaded the seatback, which yielded and rotated until it contacted the rigid support structure. The ATD then ramped upward into the roof structure, resulting in a compressive neck force that exceeded the IARV.
The test with the left second-row ATD involved a full-size pickup striking the rear of a stationary passenger car that resulted in a 32 km/h delta-V. The second-row intrusion occurred early and displaced the ATD torso forward. The measured ATD responses were all below the IARVs.
The test with the belted and instrumented ATD in the driver seat impacted by the tractor showed that second-row intrusion displaced the driver seatback and ATD forward at approximately 40% into the crash pulse duration, where the duration was defined as the time segment from impact to maximum delta-V. The chest data showed the attenuation of the ATD loading into a non-rigid seatback frame and was immediately followed by an increase in ATD loading by the intrusion of the striking vehicle that rapidly increased the ATD velocity so that it approached the striking vehicle center of gravity (CG) velocity.
The results from the study highlight the effect of forward and vertical occupant compartment intrusion on vehicle structure and ATD responses in high-speed rear impacts. The results also show that limiting front-seatback rearward rotation from intrusion would increase the acceleration loading on the ATD and that intentionally bracing the seatback would redirect the ATD kinematics.
CitationParenteau, C., Croteau, J., and Zolock, J., "The Effect of Crash Severity and Structural Intrusion on ATD Responses in Rear-End Crashes," SAE Technical Paper 2020-01-1224, 2020, https://doi.org/10.4271/2020-01-1224.
Data Sets - Support Documents
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- James , M.B. , Decker , R.L. , Warner , C.Y. Severe and Fatal Injuries in Rear Crashes 41st Annual Association for the Advancement of Automotive Medicine Conference 1997
- Prasad , P. , Kim , A. , Weerappuli , D.V.P. , Roberts , V. , and Schneider , D. Relationships between Passenger-Car Seatback Strength and Occupant Injury Severity in Rear-End Collisions: Field and Laboratory Studies 41st Stapp Car Crash Conference, Society of Automotive Engineers Warrendale, PA 1997
- Stephens , G.D. , Long , T.J. , and Blaisdell , D.M. Energy Analysis of Automotive Seat Systems SAE Technical Paper 2000-01-1380 2000 https://doi.org/10.4271/2000-01-1380
- Burnett , R. , Carter , J. , Roberts , V. , and Myers , B. The Influence of Seatback Characteristics on Cervical Injury Risk in Severe Rear Impacts Accident Analysis and Prevention. 36 591 601 2004
- Viano , D.C. and Parenteau , C.S. Serious Injury in Very-Low and Very-High Speed Rear Impacts SAE Technical Paper 2008-01-1485 2008 https://doi.org/10.4271/2008-01-1485
- Padmanaban , J. , Burnett , R. , and Levitt , A. Seatback Strength as a Predictor of Serious Injury Risk to Belted Drivers and Rear Seat Occupants in Rear-Impact Crashes SAE Technical Paper 2016-01-1512 2016 https://doi.org/10.4271/2016-01-1512
- Viano , D.C. , Parenteau , C.S. , Burnett , R. , and Prasad , P. Occupant Responses in Conventional and ABTS Seats in High-Speed Rear Sled Tests Traffic Inj Prev. 19 1 54 59 2018 Jan 2
- Viano , D.C. and Parenteau , C.S. Front-to-Rear Crashes Involving Two-Vehicles with Severe Driver Injury Traffic Injury Prevention 13 1 55 60 2012
- Severy , D.M. , Brink , H.M. , and Braird , J.D. Vehicle Design for Passenger Protection from High-Speed Rear-End Collisions SAE Technical Paper 680774 1968 https://doi.org/10.4271/680774
- Viano , D. , Parenteau , C. , Prasad , P. , and Burnett , R. Occupant Responses in High-Speed Rear Crashes: Analysis of Government-Sponsored Tests SAE Technical Paper 2008-01-0188 2008 https://doi.org/10.4271/2008-01-0188
- Mertz , H.J. , Irwin , A.L. , and Prasad , P. Biomechanical and Scaling Basis for Frontal and Side Impact Injury Assessment Reference Values Stapp Car Crash J. 60 625 657 2016
- Viano , D.C. and Parenteau , C.S. Effectiveness of the Revision to FMVSS 301: FARS and NASS-CDS Analysis of Fatalities and Severe Injuries in Rear Impacts Accid Anal v. 89 1 8 2016 Apr
- Parenteau , C.S. , Stephens , G. , Yaek , J. , and Gregory , S. The Effect of FMVSS 301R on Vehicle Structure in Rear Impact SAE Technical Paper 2020-01-1226 2020
- Viano , D.C. and Parenteau , C.S. Rear-Seat Occupant Responses in NHTSA Rear Crash Tests SAE Technical Paper 2018-01-1330 2018 https://doi.org/10.4271/2018-01-1330
- Parenteau , C.S. , Viano , D.C. Update on Second-Row Children Responses in Rear and Frontal Crashes SAE Technical Paper 2020-01-1215 2020