Dynamic fracture testing techniques for alloys

本项目的目的是了解应变速率和试样尺寸/约束对核级A508锻造钢和Ti-6Al-4V激光粉末床熔合的断裂韧性的影响。这将通过以下目标来实现：对高应变率断裂测试的标准测试方法和裂缝的尺寸效应进行文献综述，重新开发用于高应变率断裂测试的新型钻机(在本项目所需的高速下，意味着不可能停止十字头，测试程序将需要一个带有剪切销的钻机，以限制载荷，同时保护机器)开发对感兴趣的合金的动态断裂测试技术确定所考虑的合金断裂行为的应变率敏感性。发展有限元模型和分析技术来解释得到的结果。

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.