Laser-induced cratering of a 3DCC material at mesoscale: Experiments and simulations

Vincent Jaulin,Emilien Lescoute,David Hébert,Bertrand Aubert,Frédéric Malaise,Jean-Luc Rullier,E Buzaud,H Couque,A Cosculluela,E Cadoni

doi:10.1051/epjconf/201818301028

Abstract

This study concerns the damaging of a 3-Dimension Carbon/Carbon (3DCC) composite material under dynamic loading. Experiments were performed with a laser facility delivering energies between 13 and 40 J with 100 nanoseconds pulse duration. The focal spot diameter was 250 μm, leading to dynamic pressure up to 10 GPa. The focal spot being smaller than the size of the composite components, it allows us to study the dynamic behaviour of the material at mesoscopic scale. The dynamic process of this cratering is then investigated via 3D numerical simulations, and a Johnson-Holmquist model is proposed. It appears that comparison of simulations with experimental results is useful to identify the dynamic strength of individual components of composite materials.

Highlights

The dynamic behaviour of carbon-based composite materials under high velocity impacts is an active field of research
The purpose of this paper is to provide some insight on the damaging processes in a 3-Dimension Carbon/Carbon (3DCC) composite
In spite of the simplifications and imperfections, the model allowed a good estimation of all the experimental crater shapes with the evolution of the laser energy

Summary

Introduction

The dynamic behaviour of carbon-based composite materials under high velocity impacts is an active field of research. Both experimental [1][2] and numerical results [3][4] emphasize the major role played by the mesostructure. Mesoscale modelling requires much material data about damaging and cratering processes of elementary components (graphite matrix and fibers). The purpose of this paper is to provide some insight on the damaging processes in a 3DCC composite. A mesoscopic model, based on the Johnson-Holmquist model, is proposed in the second section with a complete set of parameters. Comparison of simulations with experiments is presented in the third section

Objectives

Methods

Conclusion