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Dr Bin Wang

Dr Bin Wang
Vice Dean International - CEDPS

Topics

As listed in the Research

PhD projects for research students

Ballistic impact response of multi-layered shields

In an optimal design, more often than not, an initial configuration of a structure must be modified several times to provide the optimal arrangement. The objective of the project is to develop and use a genetic algorithm to find such as arrangement for multi-layered shields.

When the nature of loading is known, systematic optimisation methods such as genetic algorithm could help find the best solution through an iterative process. It is therefore essential to use a robust optimisation scheme along with prior knowledge of the nature of loading on the structure to provide a heuristic algorithm to solve for best response. A plate of a given thickness (t) subjected to a particular ballistic threat has a certain ballistic limit (V50) and offers certain level of energy absorption. If the same plate is replaced by a set of plates of thicknesses t1 to tN , where N denotes the number of layers, in such a way that t=t1+t2+…tN, one can increase ballistic limit and energy absorption through correct selection of N-1 independent thickness variables for the same weight of the system. 

Dynamic response of impact-loaded crushable auxetic metamaterials

Auxetic metamaterials possess an artificially designed microstructure allowing them to offer some unique features not readily observed in natural materials. Auxetic materials are known to have negative Poisson’s ratio which renders them suitable for impact resistance barriers as material is jammed underneath the point of impact providing higher resistance. This is, in essence, a passive control system increasing local impact resistance of impact resistant shields. Through smart lay-up design one can combine multiple layers of auxetic materials to form a metamaterial with a beneficial contact force reduction mechanism to achieve maximum energy absorption and impact protection in the event of high velocity impact. The aim of the project is thus a detailed study of several cases to propose an optimum arrangement.