Abstract
The tensile fracture of a bidirectionally reinforced glass fiber/epoxy laminate was studied. The “hole size effect”, i.e. the reduction in strength with an increase in hole size at constant stress concentration factor, was investigated. It is shown in this paper that a size effect is exhibited by unnotched specimens for one of the principal material directions. This size effect should be taken into account in assessing the hole size effect. The inherent flaw size according to linear elastic fracture mechanics as well as the characteristics dimension according to the point-stress failure criterion of two-parameter models are determined and compared. On the basis of the results of this investigation it is suggested that the inherent flaw size as well as the characteristic dimension depend on the hole size.
Published Version
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