Dynamic 4 ENF test for a strain rate dependent mode II interlaminar fracture toughness characterization of unidirectional carbon fibre epoxy composites. (October 2016)

• Record Type: Journal Article
• Authors: Zabala, H.; Aretxabaleta, L.; Castillo, G.; Aurrekoetxea, J.
• Is Part Of: Polymer testing. Volume 55(2016:Oct.)
• Page Start: 212
• Page End: 218
• Publication Date: 2016-10
• Subjects: Delamination -- Interlaminar fracture toughness -- Mechanical properties; Polymers -- Testing -- Periodicals; Polymères -- Tests -- Périodiques; 620.1920287
• DOI: 10.1016/j.polymertesting.2016.09.001
• Languages: English
• ISSNs: 0142-9418

Abstract

Abstract: A dynamic 4ENF testing procedure has been proposed to characterize the influence of loading rate on mode II fracture interlaminar toughness of a unidirectional composite material. The stable crack growth accomplished by the proposed dynamic 4ENF procedure allows achievement of the R -curves and the in-situ compliance calibration of each specimen. This enables performance of a monotonic dynamic test and presents a great advantage for the dynamic interlaminar characterization of the composite material. The dynamic G IIC -s values obtained are similar to those determined by quasi-static loading conditions, which suggests that the proposed testing procedure is able to determine accurately the dynamic G IIC of a composite material. However, for the tested material and within the analysed loading rate range, both the determined R -curves and G IIC values do not show any clear sign of loading rate dependence.