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頁籤選單縮合
題 名 | Reanalysis of Fatigue Life Assessments of Butt Welds=對接焊件疲勞壽命之再次評估計算 |
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作 者 | 陳文璟; | 書刊名 | 華岡工程學報 |
卷 期 | 13 1999.06[民88.06] |
頁 次 | 頁25-41 |
分類號 | 440.2 |
關鍵詞 | 焊接件; 疲勞壽命; |
語 文 | 英文(English) |
中文摘要 | 本文作者多年來建立一套以疲勞裂痕衍生速度與裂痕延長速度競爭之學說,非隨 意性地定義出疲勞裂痕衍生長度,從而非隨意性地結合疲勞裂痕衍生期和裂痕延長期之預估 ,精確地計算出材料疲勞總壽命。此疲勞總壽命預估計算模式也曾應用到凹痕試片、焊接試 件、和鋼管之公扣╱母扣螺旋接頭之疲勞壽命之計算,其預估計算之結果與實際測試壽命評 比,相當吻合。 本文作者先前曾以分別量測自 A36、A514、A537、和A572之母材、熱影響 區、和焊材之機械性質和疲勞性質數據, 依此模式預估計算雙面 V 槽對接焊件之疲勞總壽 命,結果與實驗值相當吻合。在很多場合,欲量測結構體焊接部位之母材、熱影響區、和焊 材之機械性質和疲勞性質數據,用來預估計算結構體之疲勞壽命,而不破壞結構體,幾乎是 不可能的。常常只有與母材相當之鋼材,可用來量測此預估計算所須之機械性質和疲勞性質 數據。加上這些量測實驗相當費時與費錢,如果能單以母材之機械性質和疲勞性質數據,就 可精確地預估計算焊接結構體之疲勞壽命;那麼此預估計算模式將可省略熱影響區和焊材之 機械性質和疲勞性質數據,而更方便於應用到焊接結構體之疲勞壽命預估計算,進而有利強 化保固設計與防範材料疲勞損壞。本文之目的在於探討單以母材之機械性質和疲勞性質數據 , 來預估計算 A36、A514、A537、和 A572 雙面 V 槽對接焊件之疲勞總壽命之精確度與可 行性。 |
英文摘要 | A whole-life fatigue model has been developed and successfully applied to notched specimens, welded components, and threaded pin/box connectors. The predicted fatigue-life results agree very well with the experimental data. The model nonarbitrarity defines the crack initiation size, aI, thereby, nonarbitrarily joins the fatigue-crack initiation life, NI, and the fatigue-crack propagation life, N �d, estimates to give the total fatigue life, NT. A previous work has shown that the fatigue-life predictions for the double-V, butt-welded specimens of A36, A514 Grade B, A537 Class 1, and A572 Grade 52 steels agree very well with the testing results. The monotonic, cyclic, low-cycle fatigue (LCF), and fatigue-crack propagation rate (da/dN) data of base metal (BM), heat-affected zone (HAZ) and weld metal (WM) were measured and input to computation to account for the actual weldment microstructure. However, it is very often infeasible or impractical to destructively measure these monotonic, cyclic, LCF and da/dN data from the welded structural members. In many cases, the unwelded BM plate is the only material from which we can measure these data. In addition, these measurements are very time-consuming and costly. If the life predictions using only the BM data could give reasonably good results, this whole-life fatigue model would be very useful in fracture control of the welded structures. In this study, the life predictions are made again for the same double-V, butt-welded specimem assuming that the BM, HAZ and WM have equivalent properties. |
本系統中英文摘要資訊取自各篇刊載內容。