Dynamic Behaviour of Multiphase Media under High-Strain-Rate Loading

高应变率载荷下多相介质的动态行为

• 批准号: RGPIN-2014-06295
• 负责人: Petel, Oren
• 金额: $ 1.68万
• 依托单位: Carleton University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=679222
• 关键词: Dynamic; Behaviour; Multiphase; Media; under

My proposed research program investigates the dynamic response of multiphase materials under high-strain-rate loading, focusing on the role of mesoscopic variations in heterogeneity on the response of the bulk materials. This program is comprised of thrust areas pertaining to two types of multiphase materials, specifically i) foams and ii) particle-doped elastomers. The research approach will be primarily experimental, however computational investigations will complement all experimental work. The long-term objectives of the research program are summarized as: * advancing the fundamental understanding of multiphase material response under impulsive loading.* investigating and modeling multi-scale physical effects, particularly the effect of mesoscale variations on the bulk material behaviour of multiphase and multi-material systems.* develop and apply new experimental methodologies related to high-strain-rate testing of multiphase materials under impact and blast wave loading.* apply new manufacturing technologies and innovative optimization approaches to the design of materials with applications in protective equipment.* train the next generation of scientists and engineers in the area of high-strain-rate deformation.*The practical objectives of the proposed research program pertain primarily to the development of advanced materials applied to the design of protective equipment. These materials are relevant to a range of commercial applications from sporting equipment and ballistic protection to automotive and industrial safety. The multidisciplinary nature of the research plan and broad applicability ensures effective training of HQP. A summary of research efforts in the proposed thrust areas is as follows:**i) Foams are used extensively in personal and structural protective applications due to their energy absorption capabilities. In recent years, there has been an increased interest in the development of new materials to provide superior protection from a wide range of potential dangers, such as common sport-related impacts or protection from blast waves due to an explosion. The research plan is to develop a variety of property-graded foams that are optimized to reduce the levels of stress transferred to a protected body. This will be accomplished by varying the actual foam materials through the thickness of the samples as well as their density (porosity control). Producing a foam from several materials offers greater parametric variability in terms of material properties than density grading alone. The foams will be produced using additive manufacturing technologies and will be tested under quasi-static and high-strain-rate loading. The investigation focuses on the effectiveness of material grading approaches with regard to stress attenuation.**ii) Epoxies doped with hard inclusions have found applications as high-strength interstitial components. The addition of inclusions to either epoxies or elastomers at volume fractions in the range of 5-30% has been shown to result in significant strengthening of the medium in quasi-static testing. The experimental evidence suggests that a polymerized particle suspension should provide superior ballistic performance over other interstitial additives to ballistic fabrics, such as shear thickening fluids. The dynamic and failure behaviour of doped elastomers, the timescale of which has been shown to be strongly inclusion-size dependent, will be investigated at various strain rates to determine the influenced of inclusion volume fraction. The practical application of this work relates to the design of hybrid protective fabrics incorporating ceramic particles in a polymerized matrix that can provide superior ballistic, stab, and general laceration protection.

我提出的研究计划研究高应变率载荷下多相材料的动态响应，重点研究不均匀性的介观变化对块体材料响应的作用。该程序由与两种多相材料相关的推力区域组成，特别是 i) 泡沫和 ii) 颗粒掺杂弹性体。研究方法主要是实验性的，但计算研究将补充所有实验工作。该研究计划的长期目标概括为： * 增进对脉冲载荷下多相材料响应的基本理解。 * 研究和建模多尺度物理效应，特别是介观尺度变化对多相和散装材料行为的影响多材料系统。* 开发和应用与冲击和冲击波载荷下多相材料高应变率测试相关的新实验方法。* 将新的制造技术和创新的优化方法应用于防护设备中应用的材料设计。 * 培养下一代科学家和高应变率变形领域的工程师。*拟议研究计划的实际目标主要涉及开发应用于防护设备设计的先进材料。这些材料与一系列商业应用相关，从运动器材和防弹保护到汽车和工业安全。研究计划的多学科性质和广泛的适用性确保了 HQP 的有效培训。拟议推力领域的研究工作总结如下：**i) 泡沫由于其能量吸收能力而广泛用于个人和结构防护应用。近年来，人们对开发新材料越来越感兴趣，以提供针对各种潜在危险的卓越保护，例如常见的运动相关冲击或针对爆炸引起的冲击波的保护。该研究计划是开发各种经过优化的性能分级泡沫，以降低传递到受保护身体的压力水平。这将通过改变样品的厚度及其密度（孔隙率控制）来改变实际的泡沫材料来实现。与单独的密度分级相比，用多种材料生产泡沫在材料性能方面提供了更大的参数变化。这些泡沫将采用增材制造技术生产，并将在准静态和高应变率负载下进行测试。研究重点是材料分级方法在应力衰减方面的有效性。**ii) 掺杂硬质夹杂物的环氧树脂已被用作高强度间隙部件。事实证明，在环氧树脂或弹性体中添加体积分数在 5-30% 范围内的夹杂物，可以在准静态测试中显着增强介质的强度。实验证据表明，与其他防弹织物填隙添加剂（例如剪切增稠液）相比，聚合颗粒悬浮液应提供优异的防弹性能。掺杂弹性体的动态和失效行为已被证明与夹杂物尺寸密切相关，将在不同的应变率下进行研究，以确定夹杂物体积分数的影响。这项工作的实际应用涉及在聚合基质中加入陶瓷颗粒的混合防护织物的设计，该织物可以提供卓越的弹道、刺伤和一般撕裂防护。