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題名 | 鋁合金2024-T4薄板表面裂縫疲勞成長之研究=The Fatigue Surface Crack Growth of Al-Alloy 2024-T4 Plates |
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作者 | 尹加貴; | 書刊名 | 筧橋學報 |
卷期 | 3 1996.09[民85.09] |
頁次 | 頁297-322 |
分類號 | 440.39 |
關鍵詞 | 表面裂縫; 破壞韌度; 應力擴大因數應變能密度因子; Surface crack; Fracture toughness; Stress intensity factor; Strain engergy density factor; |
語文 | 中文(Chinese) |
中文摘要 | 表面裂縫常見於飛機、船舶、壓力容器等焊接處或螺栓之結構機件中,並為其結 構機件破壞的主要原因。表面裂縫之形狀一般為半橢圓形或四分之一橢圓形,由其表面可直 接以非破壞性測試量測出近表面裂縫之長度,但是裂縫深度,不易量測,導致裂縫穿透結構 機件厚度而未能預期掌握,容易發生結構機件之破壞。 本文利用鋁合金 2024-T4 為實驗材 料,進行正弦波疲勞負荷實驗,將實驗值與 Sih 與 Paris 之兩公式比較,其結果尚為滿意 。因此,以上兩公式估算之裂縫深度,可直接運用爾後結構設計與檢驗之用。 |
英文摘要 | Surface cracks, which often exist in a weld or a bolt from the structures of aircraft, ships, or pressure vessels, are the principal cause for the failure of structures. The shape of a surface crack is generally semi-elliptical or quarter-elliptical. The length of a near surface crack can be directly obtained by using non-destructive testing techniques. However, it is difficult to measure the crack depth. Thus the failure of the structure can easily occur due to the crack breaking through the whole thickness of the structure. This paper is to investigate the fatigue surface crack growth in an Al-alloy 2024-T4 plate by using traveling sinusoidal fatigue loading test. Once the length of the surface crack is measured, it is used to predict the crack depth by using two fatigue crack growth formulas given by Shi and Paris, respectively. Both predicted results are close to the experimental results. Therefore, the estimations of the crack depth by there two formulas can be applied to the structural design and inspection. |
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