Abstract
In this paper, the response of wire mesh screens to low velocity impact with blunt objects is investigated using finite element (FE) simulation. The woven wire mesh is modelled with homogeneous shell elements with equivalent smeared mechanical properties. The mechanical behaviour of the woven wire mesh was determined experimentally with tensile tests on steel wire mesh coupons to generate the data for the smeared shell material used in the FE. The effects of impacts with a low mass (4 kg) and a large mass (40 kg) providing the same impact energy are studied. The joint between the wire mesh screen and the aluminium frame surrounding it is modelled using contact elements with friction between the corresponding elements. Damage to the screen of different types compromising its structural integrity, such as mesh separation and pulling out from the surrounding frame is modelled. The FE simulation is validated with results of impact tests conducted on woven steel wire screen meshes.
Highlights
Security screen doors and window grilles (Fig. 1) are increasingly employed in a number of domestic, commercial and industrial buildings in Australia, for allowing free circulation of air in hot weather, keeping insects from entering the premises, and more importantly providing substantial resistance to forced entry [1]
Extensive experimental testing is impractical and expensive and can be avoided by using numerical models that predict the response of the security screen to impact
finite element (FE) model of same energy level impact of security screens are developed for impactor mass of 4 kg and 40 kg in order to study the influence of velocity on the impact response on the wire mesh security screen
Summary
Security screen doors and window grilles (Fig. 1) are increasingly employed in a number of domestic, commercial and industrial buildings in Australia, for allowing free circulation of air in hot weather, keeping insects from entering the premises, and more importantly providing substantial resistance to forced entry [1]. The determination of impact resistance of wire mesh security screens is essential and necessary. Extensive experimental testing is impractical and expensive and can be avoided by using numerical models that predict the response of the security screen to impact. FE model of same energy level impact of security screens are developed for impactor mass of 4 kg and 40 kg in order to study the influence of velocity on the impact response on the wire mesh security screen. The steel woven wire mesh is modelled as a homogeneous continuous sheet using fully integrated Belytschko-Tsay Shell elements and the equivalent smeared were determined using macroscopic material properties of the wire mesh obtained from tensile testing on a Shimadzu Hydraulic machine. The clamping of the wire mesh to the frame is modelled using Tie break contact elements
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