A REVIEW ON TESTING OF STEEL LEAF SPRING

Mr Ajay, D Dighe
International Research Journal of Engineering and Technology   unpublished
This study gives a brief idea about fabrication and testing procedure of steel leaf spring. The efforts have been taken for sequential analysis of leaf spring. It includes static test, fatigue test, macroscopic inspection and metallographic analysis of leaf spring. For the static test, specimens are tested on Universal testing machine (UTM) and numerical analysis is done via (FEA) using ANSYS software. Stresses and deflection results are verified for analytical and experimental results. The
more » ... al results. The fatigue tests are conducted on hydraulic-fatigue testing machine under fluctuating loads. Generally, the origin of premature fracture in leaf springs is at the hole region where there is a high stress concentration. The stress concentrators included the complex geometry of the hole, its sharp corners, notches caused by the bolt thread and various surface defects such as scabs and rolling lines in the starting sheets of unclean steel. For the detail analysis of causes of failures, the fracture surface must be inspected for Macroscopic Inspection test, Chemical analysis and Metallographic Analysis. These tests give detail idea about causes of failure from metallurgical and morphological point of view. Generally there is a steel decarburization on fracture surface during the manufacturing process, which led to inadequate hardness in the springs and the local presence of soft products (ferrite) in the material structure.
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