4-Point Thoracic Injury Criteria Development for THOR Gerald Poplin, Jason Forman, Timothy McMurry, Joseph Ash, Greg Shaw, Jeff Crandall University of Virginia Center for Applied Biomechanics SAE 2014 Government & Industry Meeting January 23, 2014 Center for Applied Biomechanics F R RIENDLY EMINDER DO NOT All material and information presented are the current opinions of the authors only, and reflect the viewpoints of NHTSA. Center for Applied Biomechanics 2 Outline Evolution and description of the THOR Research aims and objectives Overview of methodological approaches in describing • risk factors associated with thoracic rib injury • Finite Element (FE) Modeling • THOR sled test configurations • Matched cadaveric tests Statistical analyses Summary and current status Center for Applied Biomechanics 3 THOR Test Device for Human Occupant Restraint 1992 2U0V0A1 THOR Task-w2o0r0k5 2009-2012 2013 TAD-50M THOR Alpha THOR-NT Mod Kit THOR Evaluation Center for Applied Biomechanics 4 THOR Mod-Kit with SD3 Shoulder June 2012 Evaluation SD3 Test Results: Acceptable durability, biofidelity, effect on ribcage deformation Funded by NHTSA Project No: DTNH22-09-H-00247 Center for Applied Biomechanics 5 Overall Goal Aims & Objective • To develop a thoracic injury criterion for THOR that takes • advantage of THOR’s multi-point, 3D chmesett hinosdtorluomgyentation To develop a chest injury risk function for belt and airbag loading in frontal collisions for THOR Thoracic Dummy rib injury measurements in PMHS Correlation in identical sled tests Center for Applied Biomechanics 6 Development of Injury Risk Function PMHS Sled Tests FE modeling Injury Outcome 100 Develop Injury Risk Functions 90 Utilize knowledge from FE, 80 FE used to investigate injury predictors from THOR and 70 60 mechanism and identify injury outcome from PMHS 50 relevant injury criteria 40 30 20 Belt and Airbag 10 Belt only 0 0 10 20 30 40 50 60 70 Matched THOR Sled Tests Chest Deformation (from IRTRACCs) Center for Applied Biomechanics 7 FE Modeling Center for Applied Biomechanics 8 FE Modeling Goal: Study relation between multi-point chest deflection measurement and rib fracture risk Human body model (HUMOS) (Song et al. 2009, Bose et al. 2010) Sled test simulations Test Condition Sim # Sled 40 km/h 3pt Belt, 6 kN FL 6 Sled Sled 45 km/h 3pt Belt, 6 kN FL 7 (Belt only) Sled 50 km/h 3pt Belt, 6 kN FL 8 Sled 40 km/h 3pt Belt + AB, 4kN FL 9 Sled Sled 50 km/h 3pt Belt + AB, 4kN FL 10 (Belt + AB) Sled 60 km/h 3pt Belt + AB, 4kN FL 11 Sled 40 km/h AB only 12 Sled Sled 45 km/h AB only 13 (AB only) Sled 60 km/h AB only 14 Center for Applied Biomechanics 9 Chest deflection measures FE Modeling rd th 3 and 7 rib deflection along A-P direction T8 Resolved into X, Y, Z UL components (and resultant) UR UR UL LL L1 LR LL LR Center for Applied Biomechanics 10