This study focuses on evaluating the response of the Total Human Model for Safety™ lower extremity finite element model under blast loading. Biofidelity of the lower extremity model was evaluated against experiments with impact loading equivalent to underbody blast. The model response was found to match well with the experimental data for the average impactor speeds of 7 and 9.3 m/s resulting in an overall correlation and analysis rating of 0.86 and 0.82, respectively. The model response was then used to investigate response for antipersonnel mine explosion where the numerical setup consists of a charge mass of 40 g trinitrotoluene placed at a depth of 50 mm below the heel. The explosion was modeled using Multi Material-Arbitrary Lagrangian Eulerian method. The model was subjected to the graded input in terms of variation in standoff distance and mass of explosive to investigate the sensitivity of the model. The model found sensitive to the threat definition and predicted an increase of 110% in peak fluid-structure interaction force with 20% reduction in its time to peak and 29% increase in peak calcaneus axial force with a reduction of 33% in its time to peak when explosive mass varied from 40 g to 100 g. The location of the explosive below the foot was discovered to have significant effect on the injury pattern in near-field explosion. A comparative study suggested that the model predicted similar response and damage pattern compared to experimental data.

中文翻译：

---

使用详细的有限元模型计算评估腿部对极端载荷的响应


本研究的重点是评估 Total Human Model for Safety™ 下肢有限元模型在爆炸载荷下的响应。根据相当于车身底部爆炸的冲击载荷的实验评估下肢模型的生物保真度。研究发现，模型响应与平均冲击器速度 7 和 9.3 m/s 的实验数据吻合良好，总体相关性和分析评级分别为 0.86 和 0.82。然后，该模型响应用于研究杀伤人员地雷爆炸的响应，其中数值设置由放置在脚跟下方 50mm 深度的 40g 三硝基甲苯装药质量组成。使用多材料任意拉格朗日欧拉方法对爆炸进行建模。该模型根据相距距离和炸药质量的变化进行分级输入，以研究模型的灵敏度。该模型发现对威胁定义很敏感，并预测峰值流固相互作用力增加 110%，达到峰值的时间减少 20%，峰值跟骨轴向力增加 29%，达到峰值的时间减少 33%。当爆炸质量从 40 克到 100 克变化时达到峰值。人们发现脚下爆炸物的位置对近场爆炸的伤害模式有显着影响。一项比较研究表明，与实验数据相比，该模型预测了类似的响应和损坏模式。