A Finite Element Study of The Response of Thoracolumbar Junction to Accidental Mine Blast Scenario
A comprehensive,geometrically accurate,nonlinear FE model of thoracolumbar spine multisegment (T12-L5) was developed to simulate the response of thoracolumbar spine under the mine blast condition with two initial postures.The vertical accelerations along the Y-axis of the T12-L5 FE model were applied on the inferior surface of L5 based on the simulated sitting postures.For both postures,the L5 inferior surface was constrained to move only in vertical direction.The predicted responses of each motion segment during the first 100ms were computed and compared under the two conditions.The results showed that the motion segments oscillate during and after the sudden impact.The maximum compressive deformation of the discs and segmental rotations occurred at around 36ms which also corresponds to the ending of the impact force.After that,the discs expand in the opposite direction.During the expansion phase,the disc heights exceeded their original position.The predicted frequency of the vibration of the motion segments was around 15Hz,which implied that a number of oscillations occur in less than one second before dying out (with the larger amplitudes of these oscillations occurring during the first hundredths of a second).Compared against sitting posture,although the resultant magnitude of disc deformations and segmental rotations were higher due to the relative anterior position of the mass point for the napping posture,the basic trends of segmental motions and predicted injury location were similar.Under such a rapid high axial impact (up to nearly 30G within 30ms),a slight difference between the position of centre of body gravity will not produce any differences in response of the thoracolumber spine.
Finite element Thoracolumbar spine mine vibration posture
Q.H.Zhang J.Z.Li H.N.Serena Tan E.C.Teo
School of Mechanical & Aerospace Engineering,Nanyang Technological University,Singapore DMERI@DSO,Singapore
国际会议
7th Asian-Pacific Conference on Medical and Biological Engineering(第七届亚太地区生物工程学术会议)
北京
英文
2008-04-22（万方平台首次上网日期，不代表论文的发表时间）