High strain rate fracture behaviour of fused silica

18th APS-SCCM; 24th AIRAPT

Ruggiero, A.^1,2 ; Iannitti, G.^1,2 ; Testa, G.^1 ; Limido, J.^3 ; Lacome, J.L.^3 ; Olovsson, L.^3 ; Ferraro, M.^4 ; Bonora, N.^1,2

University of Cassino and Southern Lazio, Cassino

I-03043, Italy^1

TECHDYN Engineering, Rome

I-00199, Italy^2

IMPTEUS AFEA, Grenade sur Garonne

F-31330, France^3

MBDA Italia, Bacoli, I-80070, Italy^4

关键词: Calibration techniques;    Deformation and fracture;    Finite element technology;    Fracture behaviour;    Low thermal expansion;    Military industries;    Non-linear finite elements;    Wide spectral range;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/500/18/182036/pdf
DOI  :  10.1088/1742-6596/500/18/182036

来源: IOP

【 摘 要 】

Fused silica is a high purity synthetic amorphous silicon dioxide characterized by low thermal expansion coefficient, excellent optical qualities and exceptional transmittance over a wide spectral range. Because of its wide use in the military industry as window material, it may be subjected to high-energy ballistic impacts. Under such dynamic conditions, post-yield response of the ceramic as well as the strain rate related effects become significant and should be accounted for in the constitutive modelling. In this study, the Johnson-Holmquist (J-H) model parameters have been identified by inverse calibration technique, on selected validation test configurations, according to the procedure described hereafter. Numerical simulations were performed with LS-DYNA and IMPETUS-FEA, a general non-linear finite element software which offers NURBS finite element technology for the simulation of large deformation and fracture in materials. In order to overcome numerical drawbacks associated with element erosion, a modified version of the J-H model is proposed.