Photonic Doppler Velocimeter to Characterize Materials under High-strain-rate Loading

卡尔顿大学需要一个光子多普勒测速仪（PDV）来支持材料动态行为的研究活动。该设备已成为极端应变速率下材料实验研究中不可缺少的诊断工具。PDV诊断使研究人员能够以前所未有的精度对激光探头可接近的任何物体或表面的速度进行连续的时间分辨测量。PDV测量通常用于确定本构材料关系、固体中冲击诱导的相变、拉伸破坏和剪切波加载响应等特性。我们生成高质量时间分辨率数据的能力取决于我们定期访问激光测速仪的能力，缺乏激光测速仪将对我们在当前全球研发环境中保持竞争力的能力产生负面影响。该设备将直接支持与基本动态材料行为相关的广泛研究工作，以及涉及新型弹道装甲材料，航空航天结构的冲击退化和新型腹股沟保护系统的应用研究，以防御爆炸发射的碎片场。***所要求的PDV系统的多功能性及其可用于收集的有价值的信息将使我们的广泛研究工作能够在当代重要领域取得技术进步，并在加拿大HQP中推进动态材料行为的知识。申请人是动态材料行为和计算材料建模协同领域的专家，组成一个理想的团队，将充分利用所要求的设备来进行拟议的研究计划。该设备将立即集成到卡尔顿大学的现有设施中，该设施目前用于支持材料的高应变率响应研究。首席研究员在使用所需的PDV设备方面经验丰富，在他之前的研究职位上建立并验证了类似的系统，确保它将被立即有效地使用。由于国外研究机构和大学广泛使用这种设备，无法使用这种设备的研究生在看到他们的研究成果发表和被该领域的同事使用时处于极大的劣势。为了继续在国际上竞争并为HQP提供适当的培训，持续使用速度测量系统是必不可少的，没有它，我们将很难在我们的研究界保持受人尊敬的地位。目前有7名研究生直接受益于该设备的使用，随着PDV使新的研究方向得以发展，预计这一数字还会增长。

A Photonic Doppler Velocimeter (PDV) is required to support research activities into the dynamic behaviour of materials at Carleton University. This equipment has become an indispensable diagnostic tool for experimental investigation of materials at extreme strain rates. The PDV diagnostic enables an investigator to make continuous time-resolved measurements of the velocity of any object or surface that is accessible to a laser probe with unprecedented precision. PDV measurements are commonly used to determine constitutive material relationships, shock-induced phase transitions in solids, tensile failure, and shear wave loading response, among other properties. Our ability to generate the high-quality time-resolved data is dependent on our ability to regularly access a laser-based velocimeter, the absence of which will negatively affect our ability to remain competitive in the current global research and development environment. This equipment will directly support broad research efforts pertaining to fundamental dynamic material behaviour as well as efforts involving more applied investigations into novel ballistic armour materials, the impact degradation of aerospace structures, and novel groin protection systems to defend against explosively launched debris fields.***The versatility of the requested PDV system and the valuable information that it can be used to collect will enable our broad research efforts to make technological advances in areas of contemporary importance and advance knowledge of dynamic material behaviour among HQP in Canada. The applicants are experts in the synergistic fields of dynamic material behaviour and computational material modelling, forming an ideal team will make full use of the requested equipment to pursue the proposed research programs. The equipment will be immediately integrated into an existing facility at Carleton University that is currently being used to support research into the high-strain-rate response of materials. The principal investigator is experienced in the use of the requested PDV equipment, having built and validated a similar system in his previous research position, ensuring that it will be used immediately and effectively. Graduate students without access to this equipment are at an overwhelming disadvantage to see their work published and used by colleagues in the field given the broad availability of this equipment within foreign research institutes and universities. In order to continue to compete internationally and provide proper training to HQP, sustained access to a velocimetry system is essential, without which it will be hard to maintain a respectable standing within our research community. Seven graduate students currently stand to benefit directly from the use of this equipment, a number that is anticipated to grow as the PDV enables new lines of inquiry to develop.