About calculations of bearing holes in a plate from a carbon fibre reinforced plastic a bolted joint





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.

Author Biography

Yury Dyfuchyn, НТУУ "КПІ"

Кафедра ДММ і ОМ


Strizhius, V.E. (2014), “Method for Fatigue Life Analysis of Shear Joint Fasteners in Metal–Composit Joints of Aircraft Structural Elements”, Nauchnyi vestnik MGTU GA, no. 199, pp. 52–61, https://doi.org/10.26467/2079-0619-2014-0-199-52-61

Vasilevskij, E.T., Dvejrin, A.Z., Karpov, Ja.S. and Krivenda, S.P. (2010), “System of experimental support for strength calculation of composites mechanical joints”, Otkrytye informacionnye i komp'juternye integrirovannye tehnologii, no. 47, pp. 42-52.

Dvejrin, A.Z. (2014), “Review and analysis of problem state of experiment-calculated support of design of aircraft units from polymer composites with mechanical junction of parts”, Otkrytye informacionnye i komp'juternye integrirovannye tehnologii, no. 66, pp. 5-19.

Kirkach, A.B. (2011), “Problemy prochnosti boltovyh soedinenij na osnove sloistyh kompozicionnyh plastikov [Strength problems of bolted joints on the basis of layered composites]”, Vestnik HPI. Serija "Dinamika i prochnost' mashin". no. 63. pp. 45-54.

Kelly, G. and Hallström, S. (2004), “Bearing strength of carbon fibre/epoxy laminates: effects of bolt-hole clearance”, Composites. Part B: Engineering, no. 35, pp. 331-343.

Kelly, Gordon (2006), “Quasi-static strength and fatigue life of hybrid (bonded/bolted) composite single-lap joints”. Composite Structures, no. 72, pp. 119-129.

Ekh, Johan, Schön, Joakim and Melin, Gunnar (2005), “Secondary bending in multi fastener, composite-to-aluminium single shear lap joints”, Composites. Part B: Engineering, no. 36, pp. 195-208.

Rudakov, K.N. and Shukaev, S.N. (2013), “Modelling of Bolted Joint from PCM in the Program FEMAP/NX NASTRAN”, Journal of Mechanical Engineering NTUU Kyiv Polytechnic Institute”, no. 67, pp. 199-206.

Rudakov, K., Shukaev, S., Krivov, G. and Matvienko, V. (2015), “Finite element analysis of the effect of technological factors on the strength of composite bolted joins”, Mechanotronic Systems and Materials 2014. Selected Papers. Opole University of Technology 2015, pp.103-108.

Dyfuchyn, Y.N. and Rudakov, K.N. (2016), “Numerical Modelling of Bolted Joints from Composite. The Message 1. Creation of the Mixed 3D-Models”, Journal of Mechanical Engineering NTUU Kyiv Polytechnic Institute”, vol. 77, no. 2, pp. 100-107. DOI: http://dx.doi.org/10.20535/2305‐9001.2016.77.76975

Kucher, N.K., Zarazovskij, M.N. and Danil'chuk, E.L. (2012), “Deformirovanie i prochnost' sloistyh ugleplastikov pri staticheskom termomehanicheskom nagruzhenii [Deformation and strength of laminated carbon-fiber-reinforced plastics under a static thermomechanical loading], Mehanika kompozitnyh materialov, vol. 48, no. 6, pp. 963-980.

Raschety i ispytanija na prochnost'. Metody mehanicheskih ispytanij kompozicionnyh materialov s polimernoj matricej (kompozitov). Metod ispytanija na szhatie pri normal'noj, povyshennoj i ponizhennoj temperaturah [Standard 25.602-80. Calculations and strength tests. Methods of mechanical trials of composite materials with a polymeric matrix (aggregates). The Test method on compression at the normal, raised and downgraded temperatures], Iz-vo standartov, Moscow, Russia, GOST 25.602-80.

Dyfuchyn, Y.N. and Rudakov, K.N. (2016), “Numerical Modelling of Bolted Joints from Composite. The Message 2. Effect of the Backlash and PCM Structure on the Characteristics of the Stress-Strain State of Bolts”, Journal of Mechanical Engineering NTUU Kyiv Polytechnic Institute”, vol. 78, no. 3, pp. 132-145. DOI: http://dx.doi.org/10.20535/2305‐9001.2016.78.87475

Rudakov, K.M. and Dyfuchyn, Y.N. (2016), “Effect of the PCM Plate’s Structure on the Characteristics of the Stress-Strain State in the Areas of Holes of Bolted Joint with the PCM”, Tekhnolohycheskye systemy, vol. 77, no. 4. pp. 28-40.

Dyfuchyn, Y. and Rudakov, K. (2017), “Numerical Modelling of Bolted Composite Joints. Bolts Rigidity Effect on Normal Stresses in the Composite Layers”, Mechanics and Advanced Technologies, vol. 79, no. 1, pp. 19-25. DOI: http://dx.doi.org/10.20535/2521-1943.2017.79.95756

Rudakov, K.M. and Dyfuchyn, Y.N. (2017), “Analysis of breaking stresses and factors of concentration of stresses in zones of holes in test-sample composite bolted joints [Analiz razryvnykh napryazhenii i koeffitsientov kontsentratsii napryazhenii v zonakh otverstii v plastinakh s PKM obraztsa boltovogo soedineniya]”, Voprosy proektirovaniya i proizvodstva konstruktsii letatel'nykh apparatov: sb. nauch. tr. Nats. aerokosm. un-ta im. N.E. Zhukovskogo KhAI, vol. 91, no. 3, pp. 47-60.

Rudakov, K. and Dobronravov, A. (2013), “About Influence of Size of a Backlash Between a Bolt and the Hole on the Tension Condition of a Bolt of the Single-Shear Bolted Joint in a "Shearing" Zone”, Journal of Mechanical Engineering NTUU Kyiv Polytechnic Institute”, no. 69, pp. 62–71.

Bolotin, V.V. and Novichkov, Y.N. (1980), Mehanika mnogoslojnyh konstrukcij [Mechanic of multilayered structures], Mashinostroenie, Moscow, Russia.

Rudakov, K.N. and Shandura, A.S. (2015), “Numeral Ground of Application of mixed 3D-Modeley Composites at Computations of Bolted Joints”, Journal of Mechanical Engineering NTUU Kyiv Polytechnic Institute”, vol. 74, no. 2, pp. 67–76.





Original study