| Popis: |
Helical spring is being widely used in diverse industrial applications such as automobiles, airplanes, mechanical watches, lock mechanisms, airsoft gun and even in writing pens. It is a long-term investment product, which subjected to time-varying loads. Prediction of fatigue life characteristics of helical springs is a major concern. The main challenge is to find the appropriate mechanical criteria that can predict the number of life cycles. Helical springs are subjected to multi-axial load and it causes shear effect on the coil wire. In order to predict the fatigue life characteristics of under this loading condition, non-proportional multi-axis approach is preferred due to handling of varying loads. The present study focuses on performing finite element analysis (FEA) to investigate the fatigue behavior of helical spring with stress-life and strain-life approaches. FEA results are compared with the stress and strain life theoretical calculations to predict the fatigue life and numerical simulations are also carried out to determine the maximum shear stress. It is observed that strain-life approach is able to predict the fatigue life accurately than stress-life methodology. |
