NUMERICAL MODELLING OF BOLTED JOINTS FROM COMPOSITE. THE MESSAGE 1. CREATION OF THE MIXED 3D-MODELS

Юрій Миколайович Дифучин, Костянтин Миколайович Рудаков

Abstract


In modern finite element class PLM programs have the opportunity to create mixed finite element model by "gluing". It allows to create, in particular, for calculations on PC rather small 3D-models of polymeric composite materials (PCM) in bolt joints in which composite in zones of bolt-holes is body-sectional modelled, and behind them – approximately, according to the theory of "the effective module". Previously it demonstrated the possibility of using a mixed 3D-models of PCM in bolt joints through simulations to determine the minimum size of the zones of more precise PCM simulation while providing the same accuracy of the calculations. The work is dedicated to the identification of trends in the characteristics of the stress-strained state in areas of bolt-holes when the composite materials structure is changed, to reduce the absolute values of compression stresses in PCM. Created 24 of 3D-models of one shear two-row bolt joints with PCM (contact problem), which ranged PCM structure (6 options), as well as the backlash of bolts with holes (4 values). Unchanged were the value of bolt tightening force and tensile force specimen. According to the results of calculations to determine the distribution of minimum stress and contact pressure (tables, graphs). It is concluded that the structure of a PCM plate significantly affects the characteristics of the stress-strained state of the PCM in the areas of holes; that we can find a structure that will ensure the lowest values of the absolute values of compression stress and a greater strength.

Keywords


numerical 3D-modelling; composite; a bolt joint; mixed 3D-model composite; FEM

References


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DOI: http://dx.doi.org/10.20535/2305-9001.2016.77.76975

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