Effect Of Size Of Bolt On The Relative Critical Slippage Of Bolt-Nut Joint Under Transverse Loading

Ahmad Shahril, Razali (2011) Effect Of Size Of Bolt On The Relative Critical Slippage Of Bolt-Nut Joint Under Transverse Loading. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

The thread joint has been frequently used for the efficient productivity and maintainability as a machine element. However, many troubles such as loosening of bolted joints or fatigue failure of bolt were often experienced. Many attentions must be paid on the improvement of the strength and the reliability of the thread joints. It is generally said that the fastening axial force rapidly decreases by the rotation loosening of nuts if the relative slippage on the interfaces between nuts and fastened body goes beyond a certain critical limit. This critical relative slippage (Scr) that prescribes the upper limit for preventing the loosening behavior has been estimated according to the theoretically obtained equation considering the bending deformation of bolt and the geometrical constraint condition. In this paper, firstly is to provide the database for Finite Element Analysis (FEA). Then, the experimental method is to determine the Scr. After that, the behavior effect of the size bolt was determined and analyzes the result. From the result, it can be confirmed with good agreement with calculation coincided well with the experimental result.

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