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Modelling of low-velocity impact on shear thickening fluids

Mr Xiaoyu Cui, Master of Philosophy student, University of Sydney


Shear thickening fluids (STFs) have been regarded as energy absorption materials due to their remarkable rise in viscosity at high strain rate. This study aimed to develop a three-dimensional finite element (FE) model to simulate low-velocity impact process of the STFs. Based on the impact-activated solidification theory (Waitukaitis and Jaeger, 2012), the STFs were divided into two parts during impact, a solid-like cylindrical part underneath an impact striker surrounded by a liquid part. The solid-like part was simulated using a Johnson-Cook model measured from split Hopkinson bar tests, while the properties of the liquid part were derived from steady-state rheological and confined compressional measurements. It was found that the jamming front propagation is not neglected in our numerical model, although the impact load-penetration relation is comparable to the experimental one when full densification of the STFs is achieved. Then, we refined our model by further dividing the solid part into a liquid part on top of a solid-like part. The refined numerical FE model can reproduce the whole impact process of the STFs, and the impact load-penetration curve by the FE model was consistent with the experimental result.


Xiaoyu is a Master of Philosophy student at the University of Sydney, and the research field he is involved in is modelling the shear thickening fluid supervised by Dr Lin Ye.  One year prior, he completed his Master of Engineering degree in the USYD.