Effect of bolt layout on the mechanical behavior of bolted joint.

摘要

A bolted joint is a typical connection that is widely used in machine assemblies, construction of structural components etc. Owing to the easy replacement and installation, bolted joints are very popular. Bolted joint analysis involves many variables like bolt size, diameter, member thickness, number of members, loading condition, number of bolts and their different arrangements. Due to all these factors the analysis is complex. Researchers have used different approaches like analytical, experimental and numerical techniques. The analytical method requires solution of ordinary and partial differential equations, which are not easily obtainable in actual engineering problems. Experimental work requires more resources and time and it is difficult to reproduce in case of any mistake. Because of these facts the use of numerical methods is more practical and time saving.;In the present work finite element software ANSYS is used to perform a three-dimensional analysis of a single bolt joint. Finite element modeling (FEM) of the joint is discussed with boundary conditions in shear and tensile type of loading. Non-linear effects are included by introduction of contact elements at the interfacing surfaces. The results are reported for different loads due to the applied displacements of 0.06 mm, 0.08 mm and 0.1 mm, different clearances of 0.01 mm, 0.05 mm and 0.5 mm, different pretension of 500 N, 9000 N and 30000 N and different coefficient of friction of 0.1, 0.2 and 0.3. The same three-dimensional model is extended further to four bolts to see the effect of layout on the displacement pattern and stress distribution under shear type loading. Experimental verification is done for the credibility of numerical results. A tool in form of geometrical parameters to compare different layouts in terms of critical bolt is also developed. (Abstract shortened by UMI.).