Abstract
Johnson-Holmquist constitutive model parameters for Fused Silica under dynamic conditions were determined by means of an inverse calibration technique. The identification of the parameters was performed with an multi-object optimizer using experimental data generated by two different validation tests: Taylor Cylinder Impact tests and Drop Weight tests, with impact velocity and strain rate ranging from 1 to 100m/s and from 10 2 to 10 4 s −1 , respectively. The validity of the parameters set determined in this way was verified comparing numerical predictions and experimental results for an independent designed test, given by a fused silica tile impacted at prescribed velocity by a steel sphere.
Highlights
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
The validity of the parameters set determined with the proposed procedure was verified comparing numerical predictions and experimental results for an independent designed test consisting in a fused silica tile impacted at prescribed velocity by a steel sphere
The comparison of numerical and experimental results confirmed the accuracy of the calibrated JH-2 model parameters in predicting failure occurrence under dynamic conditions different than those used in the structural optimization process
Summary
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 modeling. For the identification of the model parameters, a procedure based on the inverse calibration technique of experimental validation tests was developed To this purpose, Taylor impact tests and drop weight tests were designed and performed at different impact velocities ranging from 1 to 100 m/s and a strain rate range ranging from 102 up to 104 s−1. The validity of the parameters set determined with the proposed procedure was verified comparing numerical predictions and experimental results for an independent designed test consisting in a fused silica tile impacted at prescribed velocity by a steel sphere
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