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題 名 | Effect of Material Property Approximation on Butt Weld Fatigue Life Predictions=以近似值預估對接焊件疲勞壽命之精確度分析 |
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作 者 | 陳文璟; | 書刊名 | 華岡工程學報 |
卷 期 | 14 2000.06[民89.06] |
頁 次 | 頁27-43 |
分類號 | 440.2 |
關鍵詞 | 近似值預估; 接焊件; 疲勞壽命; |
語 文 | 英文(English) |
中文摘要 | 本文作者先前曾以分別量測自焊件母材、熱影響區、和焊材對機械性質數據(包括單次拉伸試驗與周期覆變試驗)和疲勞性質數據(包括低周期疲勞試驗與疲勞裂痕延伸試驗),預估計算雙面V槽對接焊之疲勞總壽命,結果與實驗值相當吻合。但這些周期覆變機械性質和疲勞性質數據之量測實驗相當費時與費錢,通常也難在現有資料中找到。不過,這些周期覆變機械性質和疲勞性質數據通常可經由簡單之拉伸試驗數據換算取得近似值。如果能以如此取得之機械性質和疲勞性質數據近似值,就可合理地預估計算結構體之疲勞壽命;那麼此預估計算模式將方便於應用到概念設計階段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以拉伸試驗取得之近似值數據,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。 |
英文摘要 | A previous work has shown that the fatigue-life predictions for the double-V, butt-welded specimens using a nonarbitray whole-life fatigue model agree very well with the testing results. The monotonic, cyclic, low-cycle fatigue (LCF), and fatigue-crack propagation rate (da/dN) data of the base metal (BM), heat-affected zone (HAZ) and weld metal (WM) were measured and input to computation to account for the actual weldment microstructure. These data are usually not readily available. Moreover, the measurements of cyclic, LCF and da/dN data are very time-consuming and costly. It was found that these data could be approximately derived from the monotonic data obtained from a simple tensile test. If the life predictions using these data approximation could give reasonably good results, this whole-life fatigue model would be very useful in fracture control, especially in the conceptual design stage. In this study, the life predictions are made again for the same double-V, butt-welded specimen using the above mentioned, material property approximation. |
本系統中英文摘要資訊取自各篇刊載內容。