厚件結構銲接熱彈塑性行爲分析

Welded Thermo-Elasto-Plastic Analysis in Thick Specimens

鄧作樑(Tso-Liang Teng) ； 張鵬祥(Peng-Hsiang Chang)

《中國航空太空學會學刊》 31卷2期 (1999/06) Pp. 77-83

https://doi.org/10.6124/TAASRC.199906_31(2).01

摘要

一般厚件結構大多以銲接方式予以結合，而銲接殘留應力爲銲接過程中所不可避免，且殘留應力對銲接結構的脆性破壞、疲勞強度和挫屈強度皆有不良影響。故本文以熱彈塑性理論及有限元素法，考慮熟、結構偶合模式分析及非線性問題，採SAE 1020碳鋼爲材料進行厚板多層銲接之殘留應力分析，以期了解殘留應力的分布情形，並探討不同銲道坡口對殘留應力的影響，可爲提昇銲接工藝技術之參考。

關鍵字

殘留應力 ； 銲接 ； 有限元素法 ； 熱彈塑性 ； 熱、結構偶合模式

並列摘要

The joining process of thick specimens are always accomplished by fusion welding. Residual stresses attributed to welding pose significant problems in accurate fabrication of structures because those stresses heavily induce brittle fracturing and degrade the buckling strength of welded structures. Residual stresses during welding are unavoidable and their. This study employs finite element techniques of thermal-structure couple-field model to analyze the thermomechanical behavior and evaluate residual stresses in a thick plate with a multi-pass welding process. The effects of weld bead profile on residual stresses are also discussed.

並列關鍵字

Residual Stresses ； Finite Element Method ； Welding ； Thermo-Elasto-Plastic ； Thermal Structure Couple-Field Analysis