当前位置: X-MOL 学术Comput. Method Biomech. Biomed. Eng. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Effect of foam densification and impact velocity on the performance of a football helmet using computational modeling
Computer Methods in Biomechanics and Biomedical Engineering ( IF 1.7 ) Pub Date : 2020-08-25 , DOI: 10.1080/10255842.2020.1807015
Samuel T Mills 1 , Trevor S Young 1 , Lillian S Chatham 2 , Sourav Poddar 3 , R Dana Carpenter 1 , Christopher M Yakacki 1, 2
Affiliation  

The NFL recently released validated helmet-impact models to study the performance of currently used helmets. This study used the model of a Riddell Speed Classic helmet to determine the influence of the properties of protective foam padding on acceleration and deformation at two common impact locations to cause concussions. The performance of the helmet was measured before and after manipulating the material properties of the protective foam liner material using FEA software. The densification strain was adjusted by using the scale factor tool in LS-DYNA to create four material categories - soft, standard, stiff, and rigid. The helmet was tested under side and rear impacts using the four material properties at 2.0, 5.5, 7.4, 9.3 and 12.3 m/s impact speeds using the NOCSAE linear impactor model. This study suggests that the standard foam material compresses to a range that could be considered to have "bottomed out" at impact speeds at 5.5 m/s for side impacts. Despite testing a wide range of material properties, the measured accelerations did not vary dramatically across material properties. Rather, impact speed played the dominant role on measured acceleration. This is the first study to demonstrate how open-source impact models can be used to run a design of experiments and investigate the role between different materials used inside a helmet and football helmet performance.

中文翻译:

泡沫致密化和冲击速度对橄榄球头盔性能的影响使用计算建模

NFL 最近发布了经过验证的头盔撞击模型,用于研究当前使用的头盔的性能。本研究使用 Riddell Speed Classic 头盔的模型来确定保护性泡沫衬垫的特性对两个常见撞击位置的加速度和变形的影响,从而导致脑震荡。在使用 FEA 软件处理保护泡沫衬垫材料的材料特性之前和之后,测量头盔的性能。通过使用 LS-DYNA 中的比例因子工具调整致密化应变以创建四种材料类别 - 软、标准、刚性和刚性。使用 NOCSAE 线性冲击器模型在 2.0、5.5、7.4、9.3 和 12.3 m/s 冲击速度下使用四种材料属性在侧面和后方冲击下测试头盔。这项研究表明,标准泡沫材料压缩到一个可以被认为在 5.5 m/s 的冲击速度下“触底反弹”的范围。尽管测试了广泛的材料特性,但测量的加速度在材料特性之间并没有显着变化。相反,冲击速度对测量的加速度起主导作用。这是第一项展示开源影响模型如何用于运行实验设计并研究头盔内使用的不同材料与橄榄球头盔性能之间的作用的研究。相反,冲击速度对测量的加速度起主导作用。这是第一项展示开源影响模型如何用于运行实验设计并研究头盔内使用的不同材料与橄榄球头盔性能之间的作用的研究。相反,冲击速度对测量的加速度起主导作用。这是第一项展示开源影响模型如何用于运行实验设计并研究头盔内使用的不同材料与橄榄球头盔性能之间的作用的研究。
更新日期:2020-08-25
down
wechat
bug