In this work, experimental compression tests have been performed on parallelepiped specimens cut from an agglomerated cork slab. The tests have been performed both using a quasi-static testing machine and a polymeric Split Hopkinson Bar, in order to assess the sensitivity of the material to the strain rate. A standard and a high-speed digital camera have been used to collect frames of the samples during the tests. 2D DIC analyses have been conducted on the pictures of lateral faces of the specimens in order to evaluate the actual strain distributions, which showed a significant heterogeneity within each sample. Moreover, the DIC analyses on the dynamic tests have been used for evaluating the local accelerations and to compute the inertia stresses. The latter may affect the global response that can be measured by following the standard Hopkinson bar procedures, and are responsible for the fluctuations in the force histories observed in the tests at highest strain rates.

Application of DIC to static and dynamic testing of agglomerated cork material / Sasso, M.; Mancini, E.; Chiappini, G.; Sarasini, F.; Tirillò, J.. - In: EXPERIMENTAL MECHANICS. - ISSN 0014-4851. - STAMPA. - 58:7(2018), pp. 1017-1033. [10.1007/s11340-017-0369-9]

Application of DIC to static and dynamic testing of agglomerated cork material

Sarasini, F.;Tirillò, J.
2018

Abstract

In this work, experimental compression tests have been performed on parallelepiped specimens cut from an agglomerated cork slab. The tests have been performed both using a quasi-static testing machine and a polymeric Split Hopkinson Bar, in order to assess the sensitivity of the material to the strain rate. A standard and a high-speed digital camera have been used to collect frames of the samples during the tests. 2D DIC analyses have been conducted on the pictures of lateral faces of the specimens in order to evaluate the actual strain distributions, which showed a significant heterogeneity within each sample. Moreover, the DIC analyses on the dynamic tests have been used for evaluating the local accelerations and to compute the inertia stresses. The latter may affect the global response that can be measured by following the standard Hopkinson bar procedures, and are responsible for the fluctuations in the force histories observed in the tests at highest strain rates.
2018
agglomerated cork; Hopkinson bar; high-speed imaging; dynamic equilibrium; inertia stress; natural materials
01 Pubblicazione su rivista::01a Articolo in rivista
Application of DIC to static and dynamic testing of agglomerated cork material / Sasso, M.; Mancini, E.; Chiappini, G.; Sarasini, F.; Tirillò, J.. - In: EXPERIMENTAL MECHANICS. - ISSN 0014-4851. - STAMPA. - 58:7(2018), pp. 1017-1033. [10.1007/s11340-017-0369-9]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1072874
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