6061T6鋁合金之表面粗度與疲勞壽命

The Relationship between Surface Roughness and Fatigue Life of 6061T6 Aluminum Alloy

溫東成(Dong-Cherng Wen)

《中華技術學院學報》 24期 (2002/03) Pp. 151-158

https://doi.org/10.7095/JCIT.200203.0151

摘要

本研究以疲勞試驗的測試數據，探討6061T6鋁合金之表面粗度與疲勞壽命間的關係。實驗結果顯示在測試的各項表面粗度參數中，隨疲勞週數增加而變化者，以Rt為最大，而Rt的波谷曲率於疲勞初期降幅較小，隨疲勞週數增加降幅則趨於緩慢。相反的Rf因子（波谷深度／波谷半徑）在疲勞初期增幅較大，隨疲勞週數增加增幅則趨於緩和。Rf因子可充分反映疲勞過程的表面粗度變化，故由其大小數值可合理用以判斷材料的疲勞壽命。

關鍵字

鋁合金 ； 表面粗度 ； 疲勞壽命

並列摘要

In this paper, fatigue experiments were studied to find the relationship between the surface roughness change and the fatigue. The purpose was to find a possible warring signal for fatigue failure. The results show that (1) The surface roughness parameter, Rt, change obviously with the loading cycles. (2) During the first period of loading cycles, curvature of Rt valley decreases more rapidly. With increasing in loading cycles, the curvature changes slowly up to the specimen failure. (3) The Rf-factor (Valley depth/Valley radius) increases rapidly during first period of fatigue cycle and then the changes tower to slow down. The radius of curvature and the Rf-factor of surface valley provide a better rule to predict the fatigue failure.

並列關鍵字

Surface Roughness ； Fatigue Life ； Aluminum Alloy