<abstract xmlns="http://www.w3.org/1999/xhtml"><p>Statistically, at least 50% of all injuries experienced by police officers in the line of duty are due to assaults with blunt objects. Therefore, vests used by the police should provide not only good ballistic resistance, but also good protection against such threats. Foamed materials are possible to be used for body protectors or inserts of protective clothes. The effects of dynamic impact with beaters of different shapes onto behaviour of polymeric foamed material were determined. There were used four types of beaters: flat, cylindrical, edgy and cornered. Strikes with blunt objects such as a flat board, baseball bat, edgy brick, pavement brick or a sharp stone, to which a protective ware can be subjected, were simulated. The impact load was applied to the rectangular specimens, made of polyvinyl chloride foam, with a usage of a drop hammer. Plots of force versus compression for all the tested samples were obtained and analysed. The effects of impacts with beaters of different shapes onto foamed material samples were presented. A shape of the blunt object significantly influences crushing behaviour of the foamed material. The impact energy of a flat beater is absorbed effectively on a short distance, since it is spread on a relatively large surface. The cylindrical and edgy beaters did not cause fragmentation of the samples, however, on the upper surfaces of the samples, permanent deformations mapping the beaters shapes as well as some cracks occurred. An impact with a sharp object, for example, a cornered beater is very difficult to be neutralized by the foam material, because it is cumulated on a small area.</p></abstract>

Statistically, at least 50% of all injuries experienced by police officers in the line of duty are due to assaults with blunt objects. Therefore, vests used by the police should provide not only good ballistic resistance, but also good protection against such threats. Foamed materials are possible to be used for body protectors or inserts of protective clothes. The effects of dynamic impact with beaters of different shapes onto behaviour of polymeric foamed material were determined. There were used four types of beaters: flat, cylindrical, edgy and cornered. Strikes with blunt objects such as a flat board, baseball bat, edgy brick, pavement brick or a sharp stone, to which a protective ware can be subjected, were simulated. The impact load was applied to the rectangular specimens, made of polyvinyl chloride foam, with a usage of a drop hammer. Plots of force versus compression for all the tested samples were obtained and analysed. The effects of impacts with beaters of different shapes onto foamed material samples were presented. A shape of the blunt object significantly influences crushing behaviour of the foamed material. The impact energy of a flat beater is absorbed effectively on a short distance, since it is spread on a relatively large surface. The cylindrical and edgy beaters did not cause fragmentation of the samples, however, on the upper surfaces of the samples, permanent deformations mapping the beaters shapes as well as some cracks occurred. An impact with a sharp object, for example, a cornered beater is very difficult to be neutralized by the foam material, because it is cumulated on a small area.

Crushing Behaviour of the PVC Foam Loaded with Beaters of Various Shapes

Department of Mechanics and Applied Computer Science Faculty of Mechanical Engineering

Acta Mechanica et Automatica

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

{"article-title":"Crushing Behaviour of the PVC Foam Loaded with Beaters of Various Shapes"}

Statistically, at least 50% of all injuries experienced by police officers in the line of duty are due to assaults with blunt objects. Therefore, vests used by...

Crushing Behaviour of the PVC Foam Loaded with Beaters of Various Shapes

Published Online: Apr 04, 2018

Page range: 23 - 30

Received: Jan 30, 2017

Accepted: Mar 03, 2018

DOI: https://doi.org/10.2478/ama-2018-0004

Keywords
Polymeric Foams, Polyvinyl Chloride Foam, Hitting With A Blunt Object, Energy Absorption, Impact Tests, Experimental Mechanics

© 2018 Paweł Bogusz et al., published by De Gruyter Open

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Crushing Behaviour of the PVC Foam Loaded with Beaters of Various Shapes

Published Online: Apr 04, 2018

Page range: 23 - 30

Received: Jan 30, 2017

Accepted: Mar 03, 2018

DOI: https://doi.org/10.2478/ama-2018-0004

KeywordsPolymeric Foams, Polyvinyl Chloride Foam, Hitting With A Blunt Object, Energy Absorption, Impact Tests, Experimental Mechanics

© 2018 Paweł Bogusz et al., published by De Gruyter Open

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Keywords
Polymeric Foams, Polyvinyl Chloride Foam, Hitting With A Blunt Object, Energy Absorption, Impact Tests, Experimental Mechanics