INFLUENCE OF DEFECTS ON FATIGUE LIFE OF HELICAL COIL SPRING
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Abstract
A mechanical spring is defined as an elastic body whose primary function is to deflect or distort under load and which recovers its original shape when released after being distorted. Due to frequent failure of helical coil springs in various applications, analysis of fatigue life of the spring is required. In this study, Optical microscopy is performed to reveal the basic microstructure of the fractured surface and possible inclusions are also distinguished. Scanning electron microscopy (SEM) is used to characterize fine microstructure of the fractured surface and to reveal flaws that serve as crack initiation points. SEM images were taken of the defected spring and then sizes of defects were calculated from the images. These defects will be implemented in the cad model of helical coil spring and then fatigue analysis will be done to determine effect on fatigue life because of defects in helical coil springs.
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