Explosion from an anti-tank landmine under a military vehicle, known as underbody blast (UBB), may cause severe injury or even death for the occupants inside the vehicle. Severity and patterns of lower extremity, pelvis and lumbar spine injuries subjected to UBB have been found highly related to loading conditions, i.e. the vertical acceleration pulse. A computational human model has been developed and successfully simulated the tibia fracture under UBB in the previous study. In the present study, it was further improved by building a detailed lumbar spine and pelvis model with high biofidelity. The newly developed pelvis and lumbar spine were validated against component level test data in the literature. Then, the whole body model was validated with the published cadaver sled test data. Using the validated whole body model, parametric studies were conducted by adjusting the peak acceleration and time duration of pulses produced in the UBB to investigate the effect of waveform on the injury response. The critical values of these two parameters for pelvis and lumbar spine fracture were determined, and the relationship between injury pattern and loading conditions was established.

军用车辆下的反坦克地雷爆炸，被称为车身底部爆炸（UBB），可能对车内人员造成严重伤害甚至死亡。已经发现，下肢，骨盆和腰椎受伤的严重程度和方式与UBB密切相关，这与负荷条件（即垂直加速度脉冲）高度相关。在先前的研究中，已经开发了一种计算人员模型，并成功地模拟了UBB下的胫骨骨折。在本研究中，它通过建立具有高生物保真度的详细腰椎和骨盆模型而得到进一步改善。新开发的骨盆和腰椎已通过文献中的成分水平测试数据进行了验证。然后，使用已发布的尸体雪橇测试数据对整个人体模型进行验证。使用经过验证的全身模型，通过调整UBB中产生的脉冲的峰值加速度和持续时间进行参数研究，以研究波形对损伤响应的影响。确定这两个参数对骨盆和腰椎骨折的临界值，并建立损伤模式与负重状况之间的关系。