Dynamic fracture testing techniques for alloys

本项目的目的是了解应变速率和样品尺寸/约束对核级A508锻钢断裂韧性的影响，以及激光粉末熔化制备的Ti-6Al-4V。这将通过以下目标来实现：对高应变率断裂试验的标准试验方法和尺寸尺度对断裂的影响的文献综述开发一种用于高应变率断裂试验的新型试验台(在该方案所需的高速下，意味着不可能停止试验)对于十字头和试验方案将需要一个装有剪切销的试验台来限制载荷，同时保护机器)开发感兴趣的合金的动态断裂试验技术确定所考虑的合金断裂行为的应变率敏感性。开发有限元模型和分析技术来解释所获得的结果。

The aims of this project are to understand the influence of strain rate and sample size/constraint on the fracture toughness of nuclear grade A508 forged steel in addition to Ti-6Al-4V manufactured through laser powder bed fusion. This will be achieved through the following objectives:Literature review of standard test methods for high strain rate fracture testing and size scale effects on fractureDevelopment of a novel rig for high strain rate fracture testing (At the high-speeds required for this programme, means it will not be possible to stop the for the cross-head and test programme will require a rig incorporating shear pins to limit the load while protecting the machine)Develop the dynamic fracture testing techniques on the alloys of interestDetermine the strain rate sensitivity of the fracture behaviour of the alloys considered.Develop finite element models and analytical technique to interpret the results obtained.