A REVIEW PAPER ON DESIGN DEVELOPMENT AND ANALYSIS OF FORM SPRINGS OF EN48 (D) AND SS304 FOR APPLICATION IN JUNKER’S VIBRATION TEST RIG

The main spotlight of this study is to design and d evelop test rig for vibration loosening of bolts. Design and development of system components for interchangeability of different bolts. Test & Trial on test rig to develop the loosening characteristics of bolts and derive the decay graphs versus cycles. . It is widely believed that vibration causes bolt loosening. By far the most frequent cause of loosening is side sliding of the nut or bolt hea d relative to the joint, resulting in relative motion occurring in the threads. If this does not occur, then the bolts will not loosen, even if the joint is subjected to severe vibration. By a detailed analysis of the joint it is possible to determine the clamp force required to be provided by the bolts to prevent joint slip. Junker’s vibration test rig is the most popular method to measure the vibration loosening of bolts or commonly referred to as bolt decay phenomenon. The Junkers vibration test rig u ses a special form spring to connect the eccentric arrangement for providing vibration to the test specimen . Commonly used material for the material of this form spring is spring steel in the tempered form. The same experiment was carried out with Compa rative analysis of decay characteristics of individual bots with various end condition and to predict vibration loosening using this study.