Rosen T. Tenchev, Magne K. Nygard, Andreas Echtermeyer
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Design procedure for reducing the stress concentration around circular holes in laminated composites
The stress concentration around a hole in a laminated composite may be decreased by increasing the thickness (bonding of two-dimensional panels) in this area. The problem may be described as an infinite orthotropic membrane with a finite circular orthotropic inclusion (ring) and a circular hole in the middle of the ring under arbitrary in-plane loading. A method for calculation of the stress concentration at the edge of the hole is presented. The method is based on the analytical solution for the case of an infinite inclusion. The finite dimensions of the inclusion are taken into account by means of a correction coefficient which is established empirically by processing a large amount of finite element results.
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