14 Feb Paper on a test method for intermediate and high loading rates in composites
Researchers of AMADE-UdG (S.A. Medina, E.V. González, N. Blanco) and the Universidad Carlos III de Madrid (J. Pernas-Sánchez, J.A. Artero-Guerrero) have recently published the paper entitled “Guided Double Cantilever Beam test method for intermediate and high loading rates in composites” in the International Journal of Solids and Structures, Volume 264, 1 March 2023, 112118: https://doi.org/10.1016/j.ijsolstr.2023.112118
Although the rate-dependent behaviour of the interlaminar fracture toughness of fibre reinforced composites has been a matter of ongoing research in recent decades, further research is required into characterising these properties and, consequently, developing more reliable constitutive models to simulate dynamic events. Furthermore, despite the various studies that have been carried out, no consensus on which test method to use to characterise these properties has yet been reached. This paper presents a new test method for measuring the dynamic mode I interlaminar fracture toughness in composite laminates by using a novel device based on a modified Double Cantilever Beam test method with a guided tensile configuration. In contrast to other methods reported in the literature, the proposed device guarantees a symmetric crack opening and, thus, pure mode I propagation during high loading rate testing. When used in a dynamic servo-hydraulic testing machine with controllable displacement rate, a constant opening velocity can be achieved. The Guided Double Cantilever Beam testing method is validated against a quasi-static Double Cantilever Beam test, showing good agreement between the results. The testing method has been satisfactorily tested under intermediate/high loading rates, from 0.1 to 10 m/s. The authors would like to acknowledge the financial support from the Spanish Ministerio de Ciencia, Innovación y Universidades through the projects RTI2018-099373-B-I00 and RTI2018-097880-B-I00. The first author also acknowledges the grant for doctoral studies IFUdG2017/43.