tress Analysis of Bolted Joints Part I. Numerical ...（一绺头发分析螺栓接合部分即数值u2026）.pdf

Modern Mechanical Engineering, 2014, 4, 35-45 Published Online February 20 14 (/journal/mme) /10.4236/mme.2014.41005 Stress Analysis of Bolted Joints Part I. Numerical Dimensioning Method László Molnár, Károly Váradi, Balázs Liktor Department of Machine and Product Design, Budapest University of Technology and Economics, Budapest, Hungary Email: varadik@eik.bme.hu Received November 4, 2013; revised December 21, 2013; accepted January 14, 2014 Copyright © 2014 László Molnár et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. In accor- dance of the Creative Commons Attribution License all Copyrights © 2014 are reserved for SCIRP and the owner of the intellectual property László Molnár et al. All Copyright © 2014 are guarded by law and by SCIRP as a guardian. 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 distri- bution 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,