Load cell method for buckling analysis of coil springs.

概要

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Buckling load of helical compression springs can be calculated by treating them as elastic columns of equivalent compressive, flexural and shearing rigidities which vary with compression of them. If the compressive load is kept under the critical one, the axis of ideal coils remains straight, and it suddenly deflects to the lateral direction when the load reaches the critical value. But compression springs usually have initial imperfections, such as initial deflection of the coil axis and end turns which cause eccentricity of loading. Therefore, the axis deflects laterally with increasing the axial compressive load under the critical one, which is a characteristic of the imperfect columns.This paper shows a modified Southwell's method to estimate the buckling load of the perfect springs from the experimental relations between the compressive load and the fixed end moment which are detected by the multicomponents load cell. The compression tests were carried out on the coil springs of the slenderness ratio between 6 to 9.The experimental results show good agreement with the buckling load calculated by the Haringx's theory.
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