When developing the tightening process for composite bolts, ensuring that the target preload(F) required by design is achieved is a key scientific issue in meeting the mechanical properties of the connected structure. Variations in complex process factors during tightening have a large effect on the tightening torque(T)-preload curve(F), and the mechanism by which the tightening process factor affects the target preload must be considered. Using experimental means, the significance and coupling effects of tightening speed, lubrication conditions, tightening areas, joint sealants and washers have been systematically investigated. The tightening torque(T), torque coefficient(K), preload(F) and the peak stress coefficients X(σ) and interlaminar stress coefficients Y(σ) within the composite laminate are used as the main response variables, and a mathematical model between each response variable and the process factor is established to analyse the effect of significant factors on the response variables from a quantitative perspective. Finally, with a certain size of preload(F) as the optimisation target, the optimisation analysis of the tightening speed is carried out for four working conditions with different sealing conditions and different tightening area, and the optimum tightening speed for each working condition is determined. Based on the above study, an analytical method was proposed to determine the reasonable interval of tightening process parameters in this paper.
DuS Y. Advanced composite materials and aerospace engineering. Acta Mater Compos Sin2007; 24(1): 1–12.
2.
MarshG. Airbus A350 XWB update. Reinf Plast2010; 54(6): 20–24.
3.
WangH. Advanced composite part assembly: a survey of methodologies and practices. Aeronaut Manuf Technol2018; 16(07): 26–33.
4.
GaoHZengXQLiuXS, et al. Secondary damage and its inhibition strategies on joint assembling of large-scale composite components. Aeronaut Manuf Technol2017; 12(22): 28–35.
5.
XieMJ. Composite material connection technology. Shanghai: Shanghai Jiaotong University Publisher, 2016.
6.
EcclesWSherringtonIArnellRD. Frictional changes during repeated tightening of zinc plated threaded fasteners. Tribol Int2010; 43(4): 700–707.
7.
HoernigTKopferHWFriedrichC. Torque vibrations in automatized screw assembly - reasons, elimination and virtual testing. In: Proceedings of the ASME international mechanical engineering congress and exposition, San Diego, CA, 15–21 November 2013, V02BT02A007. New York: ASME.
8.
FriedrichCHubbertzH. Engineering calculation of threaded fastening systems considering deviations in advanced design. In: Proceedings of the ASME 2012 international mechanical engineering congress and exposition. Volume 3: Design, materials and manufacturing, Parts A, B, and C, Houston, TX, 9–15 November 2012, pp.865–871. New York: ASME.
9.
RomagnoliMGNassarSALeeJH. Formulation of bearing friction torque in threaded joints with nonfat contact. J Press Vessel Technol2020; 142(3): 1–7.
10.
NassarSARomagnoliMGLeeJH. Bearing friction torque in threaded fasteners with non-flat underhead contact. In: Proceedings of the ASME 2018 pressure vessels and piping conference. Volume 2: Computer technology and bolted joints, Prague, Czech Republic, 15–20 July 2018, p.V002T02A022. New York: ASME.
11.
ZakiANassarSAKrukS, et al. Inverse solution for bolt preload using surface deformation. J Press Vessel Technol2017; 139(4): 041206.
12.
GaneshmurthySNassarSA. Finite element simulation of process control for bolt tightening in joints with nonparallel contact. J Manuf Sci Eng2014; 136(2): 343–351.
13.
AbboudANassarSA. Viscoelastic strain hardening model for gasket creep relaxation. J Press Vessel Technol2013; 135(3): 031201.
14.
YangXNassarSA. Elasto-plastic clamp load analysis of bolted joint for bolt strain hardening material under separating loading. SAE Trans2007; 1: 672–680.
MengANassarSATempletonD. A novel optical method for real-time control of bolt tightening. J Press Vessel Technol2011; 133(6): 1–5.
17.
NassarSAAbboudA. An improved stiffness model for bolted joints. J Mech Des2009; 131(12): 121001.
18.
NassarSAZakiAM. Effect of coating thickness on the friction coefficients and torque-tension relationship in threaded fasteners. J Tribol2009; 131(2): 021301.
19.
ZouQSunTSNassarSA, et al. Effect of lubrication on friction and torque-tension relationship in threaded fasteners. Tribol Trans2007; 50(1): 127–136.
20.
NassarSASunTS. Surface roughness effect on the torque-tension relationship in threaded fasteners. Proc IMechE, Part J2007; 221(2): 95–103.
21.
MengAYangXNassarSA. Effect of bearing friction and hole clearance on the clamp load-deformation correlation in bolted joints. SAE Trans2007; 116: 699–706.
22.
GuessousLBarberGCZouQ, et al. A numerical investigation of Bolt underhead temperature evolution under various fastening conditions. Tribol Trans2008; 51(4): 494–503.
23.
GaneshmurthySNassarSA. Study of two-stage tightening of threaded fasteners using various tool speed combinations. In: Proceedings of the ASME 2007 pressure vessels and piping conference. Volume 2: Computer applications/technology and bolted joints, San Antonio, TX, 22–26 July 2007, pp.295–308. New York: ASME.
24.
HubbertzHFriedrichC. Thermal preload relaxation of bolted CFRP structures for flexible life time design methodology. In: European conference on spacecraft structures, 2014.
25.
FriedrichCHubbertzH. Friction behavior and preload relaxation of fastening systems with composite structures. Compos Struct2014; 110: 335–341.
26.
KopferHFriedrichCAgostinisMD, et al. Friction characteristics in light weight design focusing bolted joints. In: Proceedings of the ASME 2012 International mechanical engineering congress and exposition. Volume 3: Design, materials and manufacturing, parts A, B, and C, Houston, TX, 9–15 November 2012, pp.839–846. New York: ASME.
27.
SunD. Hole perimeter stress analysis of carbon composite bolted connections. Changzhou: Jiangsu University of Technology, 2018.
28.
GerhardTFriedrichC. Mechanical fastening of carbon composite tubes, numerical calculation of axial loading capacity and experimental verification. Compos B Eng2014; 67: 391–399.
29.
CroccoloDDe AgostinisMVincenziN. Influence of tightening procedures and lubrication conditions on titanium screw joints for lightweight applications. Tribol Int2012; 55: 68–76.
30.
CroccoloDAgostinisMDVincenziN. Experimental analysis on the tightening torque - preloading force relationship in threaded fasteners. In: Proceedings of the ASME 2010 International mechanical engineering congress and exposition. Volume 3: Design and Manufacturing, Parts A and B, Vancouver, BC, 12–18 November 2010, pp.525–533. New York: ASME.
31.
CroccoloDDe AgostinisMVincenziN. Experimental study of friction in aluminium bolted joints. EPJ Web Conf2010; 6: 8003.
32.
SenFPakdilMSaymanO, et al. Experimental failure analysis of mechanically fastened joints with clearance in composite laminates under preload. Mater Des2008; 29(6): 1159–1169.
33.
HardingAF. Experiment and design. Oxford: Oxbow Books, 1999.
34.
MinYN. Design of Experiments (DOE) application guide. Beijing: Machine Industry Publisher, 2011.
35.
LiLNaiXYCaiXL, et al. Optimization of a DOE-based experimental design for the analysis of lithium in brine. Spectrosc Spectr Anal2020; 40(08): 2617–2621.
36.
GaoBTWangXSZhongS, et al. Study on the influencing factors of bolt tightening torque coefficient based on orthogonal design test method. J Astronaut Metrol Meas2018; 38(06): 73–77.
37.
SunYDXunJLiHY, et al. Experimental study on optimization of fastener torque coefficients by response surface method. Ordnance Mater Sci Eng2018; 41(01): 97–100.
38.
ShaoGQZhuLBHongJ, et al. Analysis of the factors influencing the torque - preload relationship for heavy truck bolting. J Xi'an Jiaotong Univ2015; 49(10): 14–21.
39.
PuckASchürmannH. Failure analysis of FRP laminates by means of physically based phenomenological models. Compos Sci Technol1998; 62(12-13): 1633–1662.
40.
WangXBJiangJAChenP, et al. Analysis of tightening speed on bolt coupling reliability. Mech Eng Eng Technol2016; 45(03): 101–104.
41.
YuXL. Tribology and lubrication technology. Hefei: Hefei University of Technology Publisher, 2013.
42.
YuanXD. Principle of wear of metallic materials. Beijing: Chemical Industry Publisher, 2014.
43.
WenSZHuangP. Principles of tribology. 5th ed.Beijing: Tsinghua University Publisher, 2018.
