銲接接頭疲勞破損分析與壽命評估

Analysis of Fatigue Damage and Prediction of Life for Welded Joints

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

《中國航空太空學會學刊》 37卷4期 (2005/12) Pp. 301-315

https://doi.org/10.6124/TAASRC.200512_37(4).03

摘要

銲接結構在設計過程中，僅考慮母材疲勞強度、破壞應力及降伏強度來設計是較不充分的，還必須考慮銲接接頭疲勞壽命強度的影響因素，才能保證銲接結構的品質及安全。本研究採用ASTM A36結構用碳鋼材料經過電弧對接銲後，針對保留銲道凸緣、磨除銲道凸緣及無銲接銲道等三組不同之試片進行一系列負荷控制的疲勞試驗，實驗的結果一方面可經由觀察疲勞破斷面之巨觀、微觀組織，瞭解不同銲道幾何構型之試片實際疲勞破壞狀況及差異，作爲銲接接頭疲勞破損分析之參考，另一方面可從疲勞實驗數據迴歸統計分析的趨勢，探討建立一可靠銲接接頭疲勞壽命定量評估模型的必要性。

關鍵字

銲接接頭 ； 疲勞破損 ； 壽命評估

並列摘要

In the design of weldments, only considering the fatigue strength, ultimate stress and yield stress of materials to design is not a complete work. The effects of the welded joint composition on the fatigue life need to be considered for guaranteeing the quality and safety of weldments. In the experimental investigations into the fatigue life of the butt-welded joints, all ASTM A36 specimens including unmilled weldment, milled weldment and unwelded structure were used for fatigue tests at several constant loading levels at frequency 20 Hz and at the stress ratio R=0.1. The fatigue damage of three different specimens were analyzed from macroscopic and microscopic observation of the fracture surface. Furthermore, the prediction model of fatigue life for welded joints was discussed from the experimental statistics results.

並列關鍵字

Welded joints ； Fatigue damage ； Fatigue life prediction