Prof. Stephen Hallett (University of Bristol, UK)
Mar 06, 2017
from 02:00 PM to 03:00 PM
|Contact Name||Felix Hofmann|
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Impact of composites is a well documented problem that has been extensively studied. There is still however debate about the key damage formation mechanisms and the role of damage mode interaction. Here a series of very high fidelity finite element simulations have been developed, capturing the damage development process in low velocity impact on composite specimens in great detail. The individual delaminations and matrix cracks have been explicitly modelled, and when validated against high resolution experimental data, such models lead to new understanding of damage formation and the driving phenomena in impact events. Such models are however not suitable for modelling larger composite structures. A novel numerical technique is therefore introduce that combines 3D solid and 2D shell elements for modelling different domains to achieve a high level of fidelity locally under the impact location, whilst achieving good computational efficiency for large structures. Together with experimental studies at the different scales, the predictive capability of the numerical models was systematically validated. This modelling method demonstrated an improved computational efficiency without compromising predictive accuracy. The models are applied to a case study of low-velocity impact of a large-scale stringer-stiffened panel, showing this modelling approach to be suitable for predicating low-velocity impact damage and structural response of laminated composites over various sizes and complexities.