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Comparison of the modified three‐rail shear test and the [(+45°,−45°)] ns tensile test for pure shear fatigue loading of carbon fabric thermoplastics
Author(s) -
DE BAERE I.,
VAN PAEPEGEM W.,
DEGRIECK J.
Publication year - 2008
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/j.1460-2695.2008.01231.x
Subject(s) - materials science , shear (geology) , composite material , creep , shear stress , ultimate tensile strength , direct shear test , structural engineering , deformation (meteorology) , engineering
The (three)‐rail shear test is rarely considered for testing of fibre‐reinforced composites under pure shear fatigue loading conditions because of all experimental difficulties. However, in this article, a carbon fabric‐reinforced PPS is tested using a modified three‐rail shear test setup. The results are compared with [(+45°,−45°)] 4s tensile tests with good correspondence. All fatigue experiments were done with R = 0 and the influence of maximum shear stress and frequency is investigated. It can be concluded that an increase in maximum shear stress decreases fatigue lifetime, whereas an increase in frequency increases the lifetime. Before failure, a sudden increase in both temperature and permanent deformation could be detected. Creep tests yielded that the occurring deformation is mainly due to the fatigue loading, rather than due to creep phenomena.