MOVEMENT STRESS OF BELLOWS SUBJECTED TO DISPLACEMENT LOADING OF VARIOUS KINDS

When a bellows is subjected to axial movement, the maximum meridional stress of each longitudinal line per convolution is the same, but ther e would be a great difference if lateral deflection or angular rotatio n were applied. The corresponding formulae for the last situation are deduced in this paper and testified by our experiment. These formulae are suitable to be used in engineering projects. This paper also point s out that the maximum meridional stress is larger than the circumfere ntial stress for each kind of displacement loading. The maximum meridi onal stress usually lies in the root of the convolution. These maximum stress points are usually the dangerous areas for bellows fatigue fai lure.