Characterization of Delamination Crack in Multidirectional E-glass/epoxy Composite under Mode I Loading

Year 2017, Volume: 1 Issue: 4, 117 - 128, 27.11.2017

Fatih Darıcık , Züleyha Aslan

https://doi.org/10.26701/ems.341788

Cited By: 7

Abstract

In this study, mode I critical strain energy release rate (G_Ic) of unidirectional
E-glass/epoxy was determined by double
cantilever beam (DCB) test. Calculated G_Ic
was used to initiate delamination in numerical models. The effect of stacking
sequence and fiber orientation of the sublaminates and the effect of thickness
on mode I delamination crack length and G_Ic
distribution along the specimen width in 0^o//0^o interface
have been studied using ANSYS^®. 3-D 8-node linear interface element
INTER 205 is used to create a predefined crack path. To investigate the fiber
orientation effect, composites with [+θ₂,
90₂, -θ₂, 0₂]_s stacking sequences were
modeled. Interlaminar fracture analyses were performed by Virtual Crack Closure
Technique (VCCT). Experimental and numerical critical loads (P_cr) showed a good agreement.
According to the results, while fiber orientation affects significantly the extended
crack length and the G_Ic
distribution along the specimen width, stacking sequence only affects the G_Ic distribution.

Keywords

E-glass/epoxy, Double Cantilever Beam, Delamination, Mode I Fracture

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