ISSN: 0884-6804
Page Count: 7

End-Notched Flexure Testing and Analysis of Mode II Interlaminar Fracture Behavior of Glass-Cloth/Epoxy Laminates at Cryogenic Temperatures
Kudo, H
Fukushima Technology Centre,

Horiguchi, K
Tohoku University,

Kumagai, S
Tohoku University,

Shindo, Y
Tohoku University,

(Received 22 August 2001; accepted 22 March 2002)

Abstract

This paper presents results from an analytical and experimental study of the effect of temperature and geometrical variations on the Mode II interlaminar fracture toughness in glass-cloth/epoxy laminates. The end-notched flexure (ENF) test geometry was used for Mode II experiments, which were performed at room temperature (R.T.), liquid nitrogen temperature (77 K), and liquid helium temperature (4 K). The fracture surfaces were also examined by scanning electron microscopy to verify the fracture mechanisms. A finite element model was further used to perform the delamination crack analysis. Critical load levels, and the geometric and material properties of the test specimens were input data for the analysis, which evaluated the Mode II energy release rate at onset of delamination crack propagation. The results of the finite element analysis are used to supplement the experimental data.

Keywords:
cryomechanics, end-notched flexure testing, finite element analysis, glass-cloth/epoxy laminates, interlaminar fracture toughness

Paper ID: CTR10930J
DOI: 10.1520/CTR10930J
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