Passive and active energy dissipation devices for superior crashworthiness performance

拟议的研究计划将继续进行实验，数值和理论研究，以开发新型高性能结构吸能装置。这些研究将寻求理解和开发与许多安全应用相关的被动和主动自适应耗能结构，包括但不限于个人安全装置和汽车、航空航天和防爆工业。两个特定的研究领域是针对这些自适应能量耗散装置的发展，即：(i)挤压的切割变形模式的应用，以实现在变形过程中表现出所需和可控的负载/位移行为的系统，以及（ii）泡沫填充编织管作为一种新型能量耗散装置的理解和发展。该研究项目的长期目标是开发高性能、新颖、坚固和有效的能量吸收装置，以便在广泛的安全应用中减轻因跌倒、汽车碰撞、行人撞击、爆炸或炸弹爆炸而造成的严重伤害或死亡。****实验研究将在准静态，动态和弹道加载条件下进行，学生将使用最先进的设备，包括但不限于(i)独特的长冲程准静态拉力/压缩试验机，（ii）两个droptower测试设备，（iii）定制的气动弹道冲击装置，以及（iv）传统的准静态拉力/压缩加载机。通过使用换能器、高速摄影和相关的数字图像分析软件以及光学应变测量系统（使用传统和高速相机），将对能量吸收器的变形特性和性能进行量化。数值模型也将从申请人先前开发的工程模型中扩展，利用传统的拉格朗日有限元公式以及欧拉和光滑颗粒流体动力学技术。这些扩展模型将被实验验证，并用于理解变形行为和设计自适应耗能装置的适当策略。先前由申请人研究团队构建的理论模型将被使用、修改和扩展到优化研究中，以预测设备性能和增强。实验、数值和分析相结合的方法有望导致设计良好的自适应能量耗散系统的发展。拟议的研究补助金将协助培训高素质的人员，并在这些优质耗散装置的开发方面进行研究。**

The proposed research program will continue experimental, numerical, and theoretical studies towards the development of novel and high performing structural energy absorbing devices. These investigations will seek to understand and develop both passive and active adaptive energy dissipation structures relevant to many safety applications, including but not limited to, personal safety devices and automotive, aerospace, and blast protection industries. Two specific areas of research are targeted towards the development of these adaptive energy dissipation devices, namely, (i) the application of a cutting deformation mode of extrusions towards achieving a system which exhibits desired and controlled load/displacement behaviour during deformation, and (ii) the understanding and development of foam filled braided tubes as a novel energy dissipation device. The long term objectives of this research project are to develop high performance, novel, robust, and effective energy absorbing devices so as to mitigate serious injuries or death as a result of falls, automotive crashes, pedestrian impacts, blasts, or bomb explosions in a broad range of safety applications.****Experimental studies will be conducted under quasi-static, dynamic, and ballistic loading conditions and students will be utilizing state of the art equipment, including but not limited to (i) a unique long stroke quasi-static tension/compression testing machine, (ii) two droptower testing devices, (iii) a custom built pneumatic ballistic impact device, and (iv) traditional quasi-static tension/compression loading machines. Quantification of the deformation characteristics and performance of the energy absorbers will occur through the use of transducers, high speed photography and associated digital image analysis software, as well as optical strain measurement systems (using both traditional and high speed cameras). Numerical models will also be extended from the applicant's previously developed engineering models utilizing traditional Lagrangian finite element formulations as well as Eulerian and smooth particle hydrodynamic technologies. These extended models will be experimentally validated and used to understand deformation behaviour and appropriate strategies for design of the adaptive energy dissipation devices. Theoretical models, previously constructed by the applicant's research team, will be used, modified, and extended into optimization studies for prediction of device performance and enhancement. The combined experimental, numerical, and analytical approaches are expected to result in the development of well-engineered adaptive energy dissipation systems. Support from the proposed research grant will provide assistance to train highly qualified personnel and conduct research in the development of these superior energy dissipation devices.**