Development of numerical model to investigate the laser driven shock waves from aluminum target into ambient air at atmospheric pressure and its comparison with experiment

Shiva, S. Sai; Leela, Ch.; Chaturvedi, S.; Sijoy, C. D.; Kiran, P. Prem

doi:10.1063/1.4971619

Cited by 1 publication

(1 citation statement)

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“…Barchukov et al observed that the shock wave initiates approximately 5 mm above the metallic surfaces for pulsed CO 2 laser [14]. Studies from Sai Shiva et al showed that the shock wave transforms during propagation from planar, to cylindrical and finally to spherical [15].…”

Section: Introductionmentioning

confidence: 99%

Time-Resolved Force Measurements to Determine Positioning Tolerances for Impulse-Based Indentations

Valentino

Höhmann

Schünemann

et al. 2021

Lasers Manuf. Mater. Process.

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High-throughput experimentation methods determine characteristic values, which are correlated with material properties by means of mathematical models. Here, an indentation method based on laser-induced shock waves is presented, which predicts the material properties, such as hardness and tensile strength, by the induced plastic deformation in the substrate material. The shock wave pushes a spherical indenter inside a substrate material. For reproducible indentations, the applied load is of importance. To compare different processes and process parameters, the measured plastic deformation is normalized by the applied load. However, eccentric irradiation leads to altered beam profiles on the surface of spherical indenters and the angle of incidence is changed. Thus, the influence of eccentric irradiation is studied with an adapted time-resolved force measurement setup to determine the required positioning tolerances. The spherical indenter is placed inside a cylindrical pressure cell to increase the laser-induced shock pressure. From the validated time-resolved force measurement method we derive that deviations from the indentation forces are acceptable, when the lateral deviation of the beam center, which depends only on the alignment of the setup, does not exceed ± 0.4 mm. A vertical displacement from the focus position between -3.0 mm and + 2.0 mm still leads to acceptable deviations from the indentation force.

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Section: Introductionmentioning

confidence: 99%