SA-02-3(094) Remaining Life Assessment Methods for Boiler Weldment Parts(Life Assessment of Thermal Power Plant 2)

概要

論文の詳細を見る
Development of remaining life assessment methods of boiler piping weldments is important subjects to maintain integrity of long-term used thermal power plants. In this study, creep and creep-fatigue life evaluation methods were proposed based on experimental and analytical studies. Creep and creep-fatigue tests were performed on a base metal, heat affected zone (HAZ) simulated materials and a weld joint. Some tests were conducted in a SEM to observe damage evolution process. To clarify stress/strain distribution in the weld joint, FE analysis was performed by using a four material elements weld joint model. Weld joints were failed at the fine grain region and, creep and creep-fatigue strength of the weld joints were lower than those of the base metal. It was found that reduction of the strength was caused by faster creep strain accumulation and reduction of creep ductility due to higher multiaxialiry in the fine grain region than other regions. Creep rupture life could be predicted based on the ratio of limited stain and accumulated creep strain in the fine grain region. Creep-fatigue life was well predicted by the non-linear damage accumulation model based on the FE analysis of the weld joint. Therefore crack initiation life of boiler weldment parts can be predicted by proposed analytical procedures. On the other hand, three damage range approach was newly proposed as nondestructive method of remaining life prediction based on cavity growth behavior in the weld joint specimen.
一般社団法人日本機械学会の論文
2001-06-03

SA-02-3(094) Remaining Life Assessment Methods for Boiler Weldment Parts(Life Assessment of Thermal Power Plant 2)

スポンサーリンク

概要

著者

関連論文

スポンサーリンク