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Helical compression springs are used generally in fuel injection system of diesel engines, where it undergoes cyclic loading for more than 10 8 numbers of cycles. In order to predict probable failure positions in helical compression springs, used in fuel injection system, along the length of the spring at inner side, finite element analyses was carried out, using ABAQUS 6.10. The simulation results show an oscillatory behaviour of stresses along the length at inner side. It was confirmed that the oscillation was due to bending involved with compression. It was also revealed that the bending was due to the geometry of springs. Shear stresses along the length of the spring were found to be asymmetrical and with local maxims at starting of each middle coil. The asymmetry was due to the end coil smaller than 360 degrees. Keywords- Helical compression springs, Maximum shear stress, Finite element analysis

Investigation of probable failure position in helical compression springs used in fuel injection system of diesel engines