It also investigates the effect on incrementally increasing the bolt preload through a series of applications of the controlled torque tightening sequence.Ĭlassical analysis methods are used to develop a method of analysis that can be applied to most preloaded bolted joints. It discusses how the order that the joints nuts/bolts are tightened can affect the final bolt preload. The purpose of this paper is to develop an understanding of how bolt preloads are distributed within a joint as each bolt is tightened in turn by the use of a calibrated torque wrench. The methods presented are suitable for use in automated procedures of calculation, such as spread sheets, MathCAD ©, SMathSutdio ©, etc. The design method is also appropriate for application to sprung suspension systems. The detailed analysis method can be applied to the structure being connected by the bolted joint and the welds connecting the structure to the joint flanges. The design analysis provides a quick method of establishing the structural integrity of the asymmetrical joint. The detailed analysis method is extended, using Rotscher’s pressure cone, and is suitable to produce calculated bolt loads that can be used in a fatigue analysis. Both a detailed analysis of asymmetrical joints, using classical beam theory, and a less detailed design analysis are considered. Classical analysis methods are applied to the analysis of preloaded bolted joints that use asymmetrical bolt group patterns. The purpose of this technical note is to develop an understanding of the influence of asymmetrical geometry within preloaded bolted joints. In some cases finite element methods may be more appropriate, and the methods discussed can be used in the validation process. Interpretation of results, within the context of design standards, is provided. The article brings together a number of concepts and links them into a practical design analysis process that is applicable for many cases of preloaded bolted joints and are adequate to demonstrate the structural integrity of each element of the joint. An analysis of loads and stresses in individual bolts and dowels along with flange bending and thread shear in tapped or threaded holes is developed. The distribution of the external loads and moments within the preloaded joint is determined in relationship to individual bolts. Classical analysis methods are applied to the interaction of the joint elements subjected to combinations of both in-plane and out-of-plane loads and moments. The purpose of this paper is to present a paradigm, or guide, to the analysis of preloaded bolted joints made using multiple bolts.
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