Abstract
The classical failure criteria are phenomenological theories as they ignore the actual failure mechanism and do not concentrate on the microscopic events of failure. The main objective of the current investigation is to modify the classical failure theories to comprise the essential failure mechanism (interfacial shear failure) in the thin-layered woven-roving composite materials. An interfacial shear correction factor (MH6) is introduced into the nondimensional shear terms in the studied classical failure criteria. Thus the validity of applying these theories to the investigated material will be augmented. The experimental part of the current study is conducted on thin-layered circular specimens. The specimens are fabricated from two plies of fiber E-glass woven-roving fabric reinforced with polyester. The fabrics are laid to have [±45°] or [0°, 90°] fiber orientation. The specimens used are plain, where no macroscopic sources of stress concentration exist or having circular notches of five, seven, or nine mm radii. The specimens are subjected to low cycle completely reversed fatigue bending loading where the S-N and the R.D.-N curves are plotted for each group of specimens.
Highlights
The failure modes in woven-roving composite materials are more complex than those of other man-made materials or metals [1]
The bending strengths for both fill and warp directions are very close to the ASTM standards of glass composite [33]
One of the microscopic failure mechanisms that the classical failure theories did not consider is the interfacial shear failure
Summary
The failure modes in woven-roving composite materials are more complex than those of other man-made materials or metals [1]. The adhesion integrity between fiber and matrix is the justification for superior composite materials properties over their constituent components as discussed by a lot of researchers [2,3,4,5] Their investigations were focusing on the fiber/matrix interaction at micro level scale [2,3,4,5]. Carman et al [14] analytically investigated the influence of finite size interphase coatings applied to the structural fiber on the stress distribution in continuous unidirectional composite subjected to transverse loading. They proposed an optimization of fiber coating procedure to reduce the stress concentration at the fiber matrix interaction locations.
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