Tensile dynamic behavior of gfrp subjected to controlled strain rates and aging conditions

Asprone, Domenico and Cadoni, Ezio and Prota, Andrea and Manfredi, Gaetano (2009) Tensile dynamic behavior of gfrp subjected to controlled strain rates and aging conditions. In: frprcs9, 13-15 July 2009, Sydney, Australia.

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Strain rate sensitivity of composite material represents a primary aspect in mechanical behavior of composite structures subjected to high dynamic loading conditions. Indeed, mechanical properties of composite materials are generally affected by strain rate dependence, as shown in 1, 2, 3, 4. In particular, the initial Young's modulus and failure stress increase as the strain rate becomes higher 4,5, under both compression and tensile loading conditions. In 2007 AMRA, an Italian research center based at the University of Naples 'Federico II', coordinated a research project, funded by the European Commission, namely SAS (Security of Airport Structures) project, focusing on designing a discontinuous barrier to protect airport infrastructures from disruptive malicious actions, such as blasts or intrusions. To achieve both transparency to the electromagnetic waves used in radio-communications and high mechanical properties, GFRP (Glass Fiber Reinforced Polymer) was preferred to steel as component material of the barrier. Within such activities, dynamic characterization of the used GFRP was carried out at DynaMat laboratory of the University of Applied Sciences of Southern Switzerland, conducting dynamic tensile failure tests on GFRP samples at selected strain rates. Furthermore, in order to investigate the influence of weathering agents on dynamic mechanical behavior of the GFRP, dynamic characterization is being repeated after accelerated ageing cycles. Such activity is currently still ongoing and preliminary results are here presented.

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