Experimental and finite elements study of the behaviour of a double shear bolted joint submitted to tensile and bending forces

摘要

A great deal of work has been done since 1950 to improve the design of the bolted joint. In this paper a series of tests on a double shear blted joint was performed both by finite elements methods and testing machine. The parameters of the study are the ratio R (tensile stress/bending stress) and the tightening torque Q.We notice that the maxium stress at the hole edge evolves according to R. The most loaded fasteners are located in the tesnile part of the joint. The likeness of the distribution of stress obtained by numerical study and photostress analysis is remarkable. We also noticed a good correlation between the results proposed by finite elements analysis and strain gages measurements when the tightening torque is small. When the tightening force is great, there is a gap between the two results. The load transferred by the first and the last line becomes greater and greater when the tightening force increases. This increase of the tightening force gives rise to a bad distribution of the load perline of fastener and coneuently a bad distribution of stress concentration around the fastener's hole.