3449 ベローズ型伸縮継手の寿命評価に関する考察(G03-9 継手・溶接,G03 材料力学)

抄録

Bellows are accordion-shaped expansion joints that absorb the displacement of pipes. Bellows receive cyclic stress from the thermal expansion and contraction of pipes. The allowable number of cycles is indicated by Kellogg's expression and the S-N curve for design of JIS. However, it is not clear whether long-term used bellows are applicable to various S-N curves. Therefore, in this research, fatigue tests were performed on used bellows and new bellows, and a comparison with various S-N curves for design was made. As a result, it was confirmed that the durability of used bellows exceeds Kellogg's expression and closely approximates the S-N curve for design of JIS.