Example of the use of Data Item No. 85001. Choice of reinforcement for a circular hole in a fibre reinforced laminated plate. (Data relating to one particular set of laminate properties.)
ESDU 86003 shows how the program of ESDU 85001@ which estimates the strain distribution around a circular hole in a fibre-reinforced composite plate@ is used to establish the integrity of such a structure. Working in terms of strains and a simplified overall plate criterion@ the program can be used to generate design curves for any selected lay-up of layers with any properties. Those design curves can then be used to determine the minimum reinforcement and its lay-up to ensure that local stresses or strains around the hole boundary nowhere exceed some specified allowable values. As an illustration of the method design curves are given for a particular material@ and two fully worked examples show how they are used to establish the form of symmetrical reinforcement@ or reinforcement on one side of the plate alone@ to meet allowable maximum strain values.