Stress Analysis of Bolted Joints Part I. Numerical Dimensioning Method
Abstract: For up-to-date bolted joints, first of all in vehicles, high strength bolts of 10.9 or even 12.9 are used, which are pre-tightened up to 90% or even 100% of the yield strength. The primary aim of this high degree utilization is the weight reduction. For the analytic dimensioning of bolted joints, the VDI 2230 Richtlinien German standard provides support. However, the analytic model can mostly consider the true structural characteristics only in a limited way. The analytic modeling is especially uncertain in case of multiple bolted joints when the load distribution among the bolts depends reasonably upon the elastic deformation of the participating elements in the joints over the geometry of the bolted joint. The first part of this paper deals with the problems of numerical modeling and stress analysis, respectively specifying the analytic dimensioning procedure by applying elastic or rather elastic-plastic material law. The error magnitude in bolted joint calculation was examined in case of omitting the existing threaded connection—between the bolt and the nut—in order to simplify the model. The second part of the paper deals with the dimensioning of stands and cantilevers’ multi-bolt fixing problems, first of all, with the load distribution among the bolts keeping in view the analysis of the local slipping relations. For demonstrating the above technique, an elaborated numeric procedure is presented for a four-bolted cantilever, having bolted joints pre-tightened to the yield strength.
Cite this paper: L. Molnár, K. Váradi and B. Liktor, "Stress Analysis of Bolted Joints Part I. Numerical Dimensioning Method," Modern Mechanical Engineering, Vol. 4 No. 1, 2014, pp. 35-45. doi: 10.4236/mme.2014.41005.
References

[1]   J. H. Bickford, “An Introduction to the Design and Behavior of Bolted Joints,” Mechanical Engineering Marcel Dekker, Inc., 1990, New York.

[2]   J. M. Mínguez and J. Vogwell, “Theoretical Analysis of Preloaded Bolted Joints Subjected to Cyclic Loading,” International Journal of Mechanical Engineering Education, Vol. 33, No. 4, 2005, pp. 349-357.

[3]   O. Zhang, “Discussions on Behavior of Bolted Joints in Tension,” Transactions of the ASME Journal of Mechanical Design, Vol. 127, 2005, pp. 506-510.

[4]   DIN ISO 262. ISO general purpose metric screw treads —Selected sizes for screws, bolts and nuts, ISO 262, 1998.

[5]   Systematische Berechnung hochbeanspruchter Schraubenverbindungen Zylindrische Einschraubenverbindungen. VDI-Richtlinien, VDI 2230, 2003.

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