Abstract
This paper describes an experimental study developed to characterize the mode I and mode II fracture toughness of carbon/epoxy woven composites, using DCB and ENF tests, respectively. The laminates were manufactured using an epoxy resin and twelve woven balanced bi-directional layers of carbon fibres, all of them with the same orientation (0/90º). Significant instantaneous delaminations were observed particularly for the DCB specimen, which were responsible for an oscillatory behaviour of GI versus crack length. The maximum values obtained for GIC and GIIC were 281 and 1800 J/m2, respectively.
Highlights
I mpacts at low velocity are the main cause of in-service delaminations, which are very dangerous because they are not detected visually [1, 2] and they can affect significantly the residual properties and structural integrity [3,4,5,6,7,8]
This paper describes an experimental study developed to characterize the mode I and mode II fracture toughness of carbon/epoxy woven composites, using double cantilever beam (DCB) and end-notched flexure (ENF) tests, respectively
Significant instantaneous delaminations were observed for the DCB specimen, which were responsible for an oscillatory behaviour of GI versus crack length
Summary
I mpacts at low velocity are the main cause of in-service delaminations, which are very dangerous because they are not detected visually [1, 2] and they can affect significantly the residual properties and structural integrity [3,4,5,6,7,8]. In this context, for design purpose it is very important to understand the interlaminar fracture toughness properties of fibre reinforced composite materials. Chen et al [10] observed that the values of GIC, in stable propagation, have a dropping tendency with increasing fibre content in the range 21-39% and
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