Friction Coefficient Estimate for Threaded Joints Made of Carbon-Carbon Composite Materials

Experimental studies were carried out to estimate the friction coefficients for a screw-nut threaded pair made of spatially reinforced carbon-carbon composite materials (CCCM). Quantitative values were obtained for the thread friction coefficient and nut end friction coefficient. The ultimate screw-in torque for the CCCM threaded pair was determined, and its failure mode at a destructive screw-in torque was established. The laboratory tests were carried out to measure the tightening force. The nut screw-in torque was measured using a torque wrench.

References

[1] Ryakhovskiy O.A., Syromyatnikov V.S. The Experimental Determination of the Coefficients of Friction in Bolted Joints. Proceedings of Higher Educational Institutions. Маchine Building, 2016, no. 10(679), pp. 18–25 (in Russ.), doi: 10.18698/0536-1044-2016-10-18-25

[2] Zakharov M.N., Lyubchenko M.A. Analysis of ultimate loads on the screw joints to be used in articles made of carbon-carbon composites. Composite materials constructions, 2017, no. 4, pp. 82–87 (in Russ.).

[3] Zakharov M.N., Lyubchenko M.A., Magnitskiy I.V. Fracture criterion of threaded joints of parts from composite materials. Vestnik mashinostroyeniya, 2018, no. 12, pp. 3–6 (in Russ.).

[4] Lyubchenko M.A., Magnitskiy I.V. Evaluation of the strength of a threaded connection made of carbon–carbon composite material in the design of composite parts. Voprosy oboronnoy tekhniki. Nauchno-tekhnicheskiy sbornik. Seriya 15 “Kompozitsionnyye nemetallicheskiye materialy v mashinostroyenii” [Questions of defense equipment. Scientific and technical collection. Series 15 “Composite non-metallic materials in mechanical engineering”]. 2018, no. 3(190), pp. 14–20 (in Russ.).

[5] Guan Z., Mu J., Su F., Bian T., Huang Y., Li Z. Pull-Through Mechanical Behavior of Composite Fastener Threads. Applied Composite Materials, 2015, vol. 22, iss. 3, pp. 251–267, doi: https://doi.org/10.1007/s10443-014-9404-5

[6] Mei H., Cheng L., Ke Q., Zhang L. High-temperature tensile properties and oxidation behavior of carbon fiber reinforced silicon carbide bolts in a simulated re-entry environment. Carbon, 2010, vol. 48, iss. 11, pp. 3007–3013, doi: https://doi.org/10.1016/j.carbon.2010.01.056

[7] Detali mashin [Machine parts]. Ed. Ryakhovskiy O.A. Moscow, Bauman Press, 2014. 465 p.

[8] Kulak G.L., Fisher J.W., Struik J.H.A. Guide to Design Criteria for Bolted and Riveted Joints. American Institute of Steel Construction, Inc. 2001. 330 p.

[9] ISO/TC 20/SC 4 N 136. Aerospace-Determination of coefficients of friction of bolts and nutsunder specific conditions-complementary element. 2011. 16 p.

[10] GOST 24705–2004. Osnovnyye normy vzaimozamenyayemosti. Rez’ba metricheskaya. Osnovnyye razmery [ISO 724:1993. ISO general-purpose metric screw threads — Basic dimensions]. Moscow, Standartinform publ., 2008. 20 p.

[11] Iosilevich G.B., Stroganov G.B., Sharlovskiy Yu.V. Zatyazhka i stoporeniye rez’bovykh soyedineniy [Tightening and Locking Threaded Connections]. Moscow, Mashinostroyeniye publ., 1985. 224 p.

[12] Solov’yev V.L. Obespecheniye nadezhnosti mashin pri ikh remonte v sel’skom khozyaystve putem povysheniya tochnosti i ravnomernosti zatyazhki gruppovykh rez’bovykh soyedineniy. Kand. Diss. [Ensuring the reliability of machines during their repair in agriculture by increasing the accuracy and uniformity of tightening group threaded connections. Cand. Diss.]. Omsk, 2014. 132 p.

[13] Mortensen J. Friction Analysis of Bolts. Aalborg University Esbjerg, 2013. 83 p.