Correlation between THOR BrIC and TBI risk from full body human model

Katagiri, Maika<sup>1</sup>; Zhang, Ning<sup>1</sup>; Zhao, Jay<sup>1</sup>; Hu, Jialou<sup>1</sup>; Scavnicky, Mike<sup>1</sup>; Cyliax, Bernd<sup>1</sup>; Mueller, Ingo<sup>1</sup>; Steiner, Torsten<sup>1</sup>

Affiliations

¹TAKATA Corporation, United States, Germany, Japan

Abstract

The Brain Injury Criteria (BrIC) was recently developed by using two human head models (SIMon and GHBMC) and ATD impact and crash test data. This study used a system simulation approach to further investigate correlations between BrIC from the THOR sled tests in the NHTSA Advanced Adaptive Restraint Program (AARP) and the human occupant traumatic brain injury (TBI) AIS 4+ risks estimated with a full body human model.

Eleven sled tests for the 50thpercentile male THOR Mod Kit dummy performed in AARP were selected as the basis for this analysis. The measured THOR BrIC values from these tests ranged from 0.49 to 1.89. For each of the THOR sled tests, a FE system model was built and the correlation was confirmed with the physical test data. The full body human model, a combination of the GHBMC head model and the in-house Takata human body model (TKHM), has been validated at component and full body levels. The THOR dummy model was then replaced with the full body human model in the system and the sled test simulations for the human under the same test conditions were conducted. The maximum principal strain (MPS) and the cumulative strain damage measure (CSDM) from the human head model were calculated from deformation of the brain tissue elements. The risks of AIS 4+ TBI injuries per the CSDM and MPS measures were compared with those estimated with BrIC from the THOR sled tests using paired student t-tests.

Overall, good agreement of the head, chest and pelvis translational accelerations and the head rotational velocities between the THOR dummy and the human body model were found for the full frontal sled cases. Differences between the two were observed for the head rotational velocities under the oblique sled test conditions. The results of additional simulations where an impactor struck laterally the face-jaw of the THOR, TKHM and GHBMC indicated that the THOR head-neck twisted more and faster than the human models, which could be a major cause of the inconsistency in the oblique cases.

Linear correlations between the THOR BrIC and the AIS 4+ TBI risk estimations from CSDM and MPS outputs of the human model were observed (with R² score of 0.81 for CSDM and R²=0.85 for MPS). The TBI risks estimated from the THOR sled tests and the human model were similar in the full frontal, while th e BrIC from the THOR sled tests overestimated the TBI risks.

Links

URL: http://www-esv.nhtsa.dot.gov/Proceedings/24/files/24ESV-000429.PDF

Cited Works (13)

Year	Entry
1986	Nyquist GW, Cavanaugh JM, Goldberg SJ, King AI. Facial impact tolerance and response. In: Proceedings of the 30th Stapp Car Crash Conference. October 27-29, 1986; San Diego, CA. Warrendale, PA: Society of Automotive Engineers:379-400. SAE 861896.
1998	Davidsson J, Deutscher C, Hell W, Linder A, Lövsund P, Svensson MY. Human volunteer kinematics in rear-end sled collisions. In: Proceedings of the 1998 International IRCOBI Conference on the Biomechanics of Impact. September 16-18, 1998; Göteberg, Sweden.289-301.
1977	Nahum AM, Smith R, Ward CC. Intracranial pressure dynamics during head impact. In: Proceedings of the 21st Stapp Car Crash Conference. October 19-21, 1977; New Orleans, LA. Warrendale, PA: Society of Automotive Engineers:339-366. SAE 770922.
2007	Zhao JZ, Narwani G. Biomechanical analysis of hard tissue responses and injuries with finite element full human body model. In: Proceedings of the 20th International Technical Conference on the Enhanced Safety of Vehicles (ESV). June 18-21, 2007; Lyon, France.
1988	Allsop DL, Warner CY, Wille MG, Schneider DC, Nahum AM. Facial impact response: a comparison of the Hybrid III dummy and human cadaver. In: Proceedings of the 32nd Stapp Car Crash Conference. October 17-19, 1988; Atlanta, GA. Warrendale, PA: Society of Automotive Engineers:139-155. SAE 881719.
2001	Hardy WN, Foster CD, Mason MJ, Yang KH, King AI, Tashman S. Investigation of head injury mechanisms using neutral density technology and high-speed biplanar x-ray. Stapp Car Crash J. 2001;45:337-368. SAE 2001-22-0016.
2013	Mao H, Zhang L, Jiang B, Genthikatti VV, Jin X, Zhu F, Makwana R, Gill A, Jandir G, Singh A, Yang KH. Development of a finite element human head model partially validated with thirty five experimental cases. J Biomech Eng. November 2013;135(11):111002.
2013	Takhounts EG, Craig MJ, Moorhouse K, McFadden J, Hasija V. Development of brain injury criteria (BrIC). Stapp Car Crash J. November 2013;57:243-266.
1986	Wismans J, van Oorschot H, Woltring HJ. Omni-directional human head-neck response. In: Proceedings of the 30th Stapp Car Crash Conference. October 27-29, 1986; San Diego, CA. Warrendale, PA: Society of Automotive Engineers:313-331. SAE 861893.
1999	Deng B. Kinematics of Human Cadaver Cervical Spine During Low-Speed Rear-End Impacts [PhD thesis]. Detroit, MI: Wayne State University; 1999.
2007	Hardy WN, Mason MJ, Foster CD, Shah CS, Kopacz JM, Yang KH, King AI, Bishop J, Bey M, Anderst W, Tashman S. A study of the response of the human cadaver head to impact. Stapp Car Crash J. 2007;51:17-80. SAE 2007-22-0002.
1995	Thunnissen J, Wismans J, Ewing CL, Thomas DJ. Human volunteer head-neck response in frontal flexion: a new analysis. In: Proceedings of the 39th Stapp Car Crash Conference. November 8-10, 1995; San Diego, CA. Warrendale, PA: Society of Automotive Engineers:439-460. SAE 952721.
1992	Trosseille X, Tarriére C, Lavaste F, Guillon F, Domont A. Development of a F.E.M. of the human head according to a specific test protocol. In: Proceedings of the 36th Stapp Car Crash Conference. November 2-4, 1992; Seattle, WA. Warrendale, PA: Society of Automotive Engineers:235-253. SAE 922527.