Continuously Graded Cementitious Material for Blast Protection of Structures

最近在城市地区发生的涉及使用爆炸物的恐怖主义袭击暴露了建筑物和其他基础设施易受爆炸的脆弱性。直接处于爆炸压力波路径上的结构受到高强度和短持续时间的压力载荷。由于许多重要的结构和设施在设计时没有考虑这些荷载，因此为现有建筑物和其他基础设施制定和实施爆炸缓解战略已成为一个关键的优先事项。本研究的中心思想是研究一个保护系统的概念，该系统利用几何效应和材料的不可逆压实来耗散入射爆炸压力波的能量。将开发一种对爆炸压力波传播具有连续分级阻抗（电阻）的胶凝材料。建议设计材料抵抗冲击波传播的能力，以通过材料的几何效应和不可逆压实实现最佳能量耗散。拟议的研究结果将形成的基础上，设计一种胶凝材料，用于在实际应用中的爆炸缓解策略。本提案概述的工作涉及三个关键问题：（a）材料爆炸反应的实验测定;（B）材料冲击反应的数值模拟;（c）具有分级特性的材料的材料生产技术。教育部分主要侧重于少数民族学生。这项研究将受益于校园里已经在运作的许多项目的存在，以提高在科学和工程中代表性不足的群体的参与。

Recent terrorist attacks in urban areas involving the use of explosives have exposed the vulnerability of buildings and other infrastructure to blasts. Structures directly in the path of the blast pressure wave are subjected to high-intensity and short-duration pressure loading. Because many important structures and facilities have been designed without considering such loads, developing and implementing blast mitigation strategies for existing buildings and other infrastructure, has become a critical priority. The central idea of this research is to study the concept of a protective system which provides dissipation to the energy of an incident blast pressure wave using geometric effects and irreversible compaction of material. A cementitious material, with continuously graded impedance (resistance) to the blast pressure wave propagation will be developed. It is proposed to engineer the material resistance to shock wave propagation to achieve optimum energy dissipation through geometric effects and irreversible compaction of the material. The outcome of the proposed research will form the basis for designing a cementitious material for use in blast mitigation strategies in practical applications. The work outlined in this proposal deals with three key issues: (a) experimental determination of the blast response of material; (b) numerical modeling of shock response of material; and (c) material production techniques for material with graded properties. The educational component is primarily focused on minority students. The research will benefit from the presence on the campus of many programs already in operation to enhance the participation of underrepresented groups in science and engineering.