Abstract
We present the results of an experimental campaign conducted on the LULI2000 laser facility. Semi-infinite targets of a commercial grade of porous graphite were submitted to high-power laser irradiation inorder to generate craters. A 15 ns pulse duration was used along with a focal spot diameter of 900 µm to deliver energies up to 750 J. Numerical simulations of these shots have been performed following a specificmethodology which can be divided in three steps. Firstly, the mechanical loading induced by the laser iscalibrated by simulating the same shot on a thin aluminum target of which free surface velocity is measured byPDV and line-VISAR. Secondly, the same shot is performed on a thin graphite target to validate the materialmodel of graphite. Thirdly, the craterization shot on semi-infinite target is simulated. Numerical results arecompared to experimental measurements of craters obtained using an interferometric profilometer.
Highlights
The cratering process in brittle materials is a major concern for the aerospace industry which has to design satellites and spacecrafts able to withstand impacts of meteoroids or debris at several kilometers per second
The mechanical loading induced by the laser is calibrated by simulating the same shot on a thin aluminum target of which free surface velocity is measured by PDV and line-VISAR
The material chosen for this study is a porous graphite called EDM3 but, in a first step, we perfom a shot on a thin aluminum target because this well-known material does not raise any problem of modeling
Summary
The cratering process in brittle materials is a major concern for the aerospace industry which has to design satellites and spacecrafts able to withstand impacts of meteoroids or debris at several kilometers per second. We present laser-driven cratering experiments performed on the LULI2000 laser facility and the corresponding simulations. Such simulations require a preliminary study on thin targets to determine the mechanical loading induced by the laser on the target. It is possible to record the velocity of the back surface. Comparing these measurements with numerical results, we can access to the laser loading. The same shot is performed on a thin EDM3 target to validate our model of this material. We note that EDM3 has already been studied under hypervelocity impacts [3, 4] and laser-driven shocks [5, 6]
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