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原文传递 Development and Validation of a Finite Element Model of the THOR Lower Extremity. Final Report.

题名：	Development and Validation of a Finite Element Model of the THOR Lower Extremity. Final Report.
作者：	Varellis-J.; Campbell-J.Q.; Tannous-R.E.
关键词：	Restraint-system-tests; Extremities-; Humans-; Test-devices.;Biomechanics-; Motor-vehicle-accidents; Crash-tests; Crash-injuries; Dummies-; Safety-devices; Finite-element-method; Acceleration-; Crashworthiness-; Impact-tests; Bodies-; Mechanical-porperties; Accident-prevention; Human-factors-engineering.
摘要：	A three-dimensional finite element model was developed to represent the response of the THOR lower extremity (THOR-LX). CAD drawings of the THOR-LX hardware were used to construct the geometry of the model. Most of the components were modeled as rigid bodies, with the exceptions of the tibia skin, foot skin, tibia compliance spring, the heel padding/shoe, and the Achilles cable. To account for the movement of the lower extremity, one translational joint was created for compression of the tibia and three revolute joints were created to allow movement of the ankle. Stiffness and damping properties were assigned for each of the joints to represent the mechanical properties in the physical THOR-LX. The finite element model outputs the same measurements as the THOR-LX dummy: load cells, two accelerometers, and rotation angles of the ankle. The completed finite element model was correlated with the physical THOR-LX by simulating ten physical experiments and comparing the results. Three impacts to the ball of the foot were conducted to evaluate the dorsi joint performance. Two heel impacts were performed to evaluate the tibia compliance. Three Achilles tests were conducted to assess the Achilles cable forces. Two skin tests were performed to determine the effect of the skin on the tibia forces. The time histories for impactor deceleration, load cell forces, and joint angles and moments calculated for these tests all compared well to the experimental data. Therefore, it is concluded that the finite element model can be used to accurately predict the results of physical tests performed with the THOR-LX.
报告类型：	科技报告