Dynamic Behaviour of Polymer-Matrix Materials

我建议的研究项目是研究高应变率加载下聚合物基材料的动态响应，重点研究非均质性中的细观变化对主体材料响应的影响。这些材料的动态响应在细观结构变形和重组下表现出强烈的速率依赖性行为，这在保护性应用中经常被利用。这项研究计划涵盖与这些类型的材料有关的两个主要领域：(I)聚合物基复合材料(PMC)和(Ii)聚合物泡沫和多孔材料，每种材料都有自己的异质特性。这些推力领域共同定义了高应变率加载下聚合物基材料的综合研究计划。该研究计划的主要长期目标包括： 提高材料在冲击载荷作用下的基本知识。 研究散体物质行为的中尺度变化 开发新的实验测试方法 探索防护装备的创新材料 培养下一代研究人员和创新者 现将拟议推力领域的研究工作摘要如下： (I)私营军保公司有潜力改进现有的保护技术。在PMC中添加硬质夹杂物通常会增强周围的聚合物基质，然而，在高应变率下，可用于关联介观性质和块体材料响应的数据有限。这项工作的最终目的是调查在几个数量级的应变率范围内，PMCs的广泛参数变化对其变形和破坏行为的影响。 (2)泡沫塑料因其吸收能量的能力而被广泛用于保护用途。新的制造技术使保护结构的中尺度优化成为可能，以针对广泛的潜在伤害事件提供卓越的保护。拟议研究的主要目标是利用新的诊断功能，如高速X射线摄影系统，进一步了解泡沫塑料在各种脉冲加载条件下的动态响应。 拟议研究的直接工业应用主要与保护设备的进步有关。研究计划的多学科性质，包括材料元素、分层设计、多速率实验测试平台和尖端成像方式，为我的HQP提供了有效的培训环境。HQP培训将通过与工业和政府合作伙伴的密切合作进一步丰富，重点放在改进与一系列商业应用(例如头盔)相关的防护材料和测试技术上。这一研究计划，以及来自代表不足群体的HPQ的有效整合，将导致创新的HQP为加拿大带来经济利益。

My proposed research program investigates the dynamic response of polymer-matrix materials under high-strain-rate loading, focusing on the role of mesoscopic variations in heterogeneity on the response of the bulk materials. The dynamic response of these materials can exhibit strongly rate-dependant behaviour under mesostructural deformation and reorganization, which is often exploited in protective applications. This research program covers two thrust areas pertaining to these types of materials: (i) Polymer-matrix composites (PMCs) and (ii) Polymer foams and cellular materials, which each have their own heterogeneous characteristics. Together these thrust areas define a comprehensive research program into polymer-matrix materials under high-strain rate loading. The principal long-term objectives of the research program include: advancing the fundamental knowledge of materials under impulsive loading. investigating mesoscale variations on bulk material behaviour developing new experimental test methodologies exploring innovative materials for protective equipment training the next generation of researchers and innovators A summary of the research efforts in the proposed thrust areas is as follows: (i) PMCs have the potential to improve existing protective technologies. The addition of hard inclusions within PMCs often strengthen the surrounding polymer matrix, however limited data is available to relate mesoscale properties and bulk material response at the high strain rates. The ultimate objective of this work is to investigate the effects of a broad parametric variation of PMCs on their deformation and failure behaviour across several orders of magnitude of strain rates. (ii) Foams are used extensively in protective applications due to their energy absorption capacity. New manufacturing techniques have enabled mesoscale optimization of protective structures to provide superior protection against a wide range of potentially injurious events. The primary objective of the proposed research is to further our understanding of the dynamic response of foams under a variety of impulsive loading conditions using novel diagnostic capabilities, such as a high-speed X-ray cinematography system. The immediate industrial applications of the proposed research pertain primarily to the advancement of protective equipment. The multidisciplinary nature of the research plan, which includes elements of materials, hierarchical design, multi-rate experimental testing platforms and cutting-edge imaging modalities provides an effective training environment for my HQP. HQP training will be further enriched by close collaborations with industrial and government partners focused on advancing protective material and testing technologies relevant to a range of commercial applications (e.g., helmets). This research program, and the effective integration of HPQ from under-represented groups, will result in innovative HQP providing economic benefits to Canada.