About calculations of bearing holes in a plate from a carbon fibre reinforced plastic a bolted joint
Keywords:numerical 3D-modelling, FEM, composite, a bolt joint, strength
Purpose. In order to carry out calculations of net-tension failure of the weakened cross-section of bolted joints with CFRP,
it is necessary to estimate the value of the generalized stress concentration factor at the hole.
Methodology. Used a method of finite-elements and the 3D contact model as much as possible approached to real geometry and
conditions of load application. Earlier, the authors created 24 3D models of samples of single-shear two-row bolted joint with CFRP
(contact task), in which the structures of CFRP (6 variants) varied, as well as the side gap of bolts with holes (4 values).
The magnitude of the contraction force of the packet and the force that stretched the sample were unchanged. Based on the results of
calculations, stress distributions are determined in CFRP plates at the holes (tables, graphs) are calculated.
Findings. Based on these results and additional calculations, the following conclusions were reached:
- in static strength analysis of bolted joints on bearing have entered the correction function which parameters are characteristics of
structure composite and bend factor;
- the specified kind of correction function is necessary for receiving in additional researches (natural or numerical), that will allow
to create a database for sizes of this function for actual variants in branch power bolted joints with composites.
Originality. The possible algorithms for estimating the static tensile strength of bearing of bolted joints with CFRP are substantiated.
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