当前位置: X-MOL 学术Opt. Laser Eng. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Analytical model to determine the relevant parameters governing the transferred momentum to spherical indenters by laser-induced shock waves
Optics and Lasers in Engineering ( IF 4.6 ) Pub Date : 2021-05-19 , DOI: 10.1016/j.optlaseng.2021.106670
Tobias Valentino

Rapid material development is a new approach to reduce the time and cost intensity. It is based on small and simple sample geometries. Many conventional test methods such as hardness measurements or tensile tests are not suitable for this approach, because they either require a sample geometry adapted to the test method or they are time-consuming. Thus, research is being conducted on a novel impact-based method, which allows short time indentations and correlations with mechanical material properties such as hardness and tensile strength: With a high intensity pulsed TEA-CO2 laser, a shock wave is generated on top of a spherical indenter. The momentum of the shock wave pushes the indenter inside a sample. From the induced indentations, characteristic values such as indentation depth and indentation diameter are extracted, which correlate well with the material hardness and tensile strength. Still, the process dynamics are not fully understood. Thus, a model is developed to determine the main parameters that govern the interaction between laser-induced shock wave as well as indenter and accordingly, significantly affect the forming energy. The model is validated by experimental results. From the findings of the analytical model and the conducted experiments, fundamental correlations with respect to the available forming energy are determined. The main parameters influencing the available forming energy are pulse energy, pulse duration, laser spot area, density of the ambient medium and indenter mass.



中文翻译:

确定用于控制激光诱导的冲击波将动量传递到球形压头的相关参数的分析模型

快速的材料开发是减少时间和成本强度的新方法。它基于小而简单的样品几何形状。许多常规测试方法(例如硬度测量或拉伸测试)不适合此方法,因为它们要么需要适合于该测试方法的样品几何形状,要么很耗时。因此,正在研究一种新的基于冲击的方法,该方法可实现短时间的压痕以及与机械材料特性(例如硬度和拉伸强度)的关联:使用高强度脉冲式TEA-CO 2激光,在球形压头顶部会产生冲击波。冲击波的动量将压头推入样品内部。从所产生的压痕中,提取出诸如压痕深度和压痕直径之类的特征值,这些特征值与材料硬度和抗拉强度密切相关。仍然没有完全了解过程动力学。因此,开发了一个模型来确定主要参数,这些主要参数控制着激光诱发的冲击波与压头之间的相互作用,从而显着影响成型能量。通过实验结果验证了该模型。从分析模型的发现和进行的实验中,可以确定与可用成型能的基本相关性。

更新日期:2021-05-19
down
wechat
bug