Laser shock wave propagation in a 3D woven composite material : experiment and simulation
Bibliographic record
Abstract
The propagation of a laser shock wave within a composite material used in aeronautics is investigated.The material is made of carbon fibres woven according to a 3D pattern within an epoxy matrix.A shock wave is generated by an impulsive (of order 10 ns) intense laser beam of power a few GW/cm 2 , focused on the surface of a thin metallic layer attached to the composite.The metallic surface ablation results in an expanding plasma inducing a shock wave in the material with a peak stress of a few GPa.Its propagation can be measured by the velocity of the opposite surface of the sample detected by laser interferometry.The high frequency content of the signal and the heterogeneous and anisotropic behaviour of the material induce a complex propagation.A measurement campaign has been performed for different samples.A 2D numerical model has been developed based on a finite difference discretisation of the equations of linear elastodynamics for the propagation part, combined with a nonlinear model of the source.Sample geometry and fibre orientations are obtained from analysis of the images of transversal cuts of the samples.Experimental data are statistically compared to the model and discussed.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".