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題 名 | 尖銳凹槽316L不鏽鋼管在純彎曲潛變及鬆弛負載下行為之實驗與理論研究=Experimental and Theoretical Analysis of the Response for 316L Stainless Steel Tubes under Pure Bending Creep and Relaxation |
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作 者 | 李國龍; 潘文峰; | 書刊名 | 技術學刊 |
卷 期 | 30:3 2015.09[民104.09] |
頁 次 | 頁163-170 |
分類號 | 440.365 |
關鍵詞 | 尖銳凹槽316L不鏽鋼管; 純彎曲潛變; 潛變曲度; 潛變橢圓化; 純彎曲鬆弛; 鬆弛彎矩; 鬆弛橢圓化; Sharp-notched 316L stainless steel tubes; Pure bending creep; Creep curvature; Creep ovalization; Pure bending relaxation; Relaxation moment; Relaxation ovalization; |
語 文 | 中文(Chinese) |
中文摘要 | 本文主要是實驗及理論研究尖銳凹槽316L不鏽鋼管承受純彎曲潛變及鬆弛負載下的行為。純彎曲潛變係指試件被彎曲至某個預設的彎矩後,並維持該彎矩一段時間,而純彎曲鬆弛係指試件被彎曲至某個預設的曲度後,並維持該曲度一段時間。由純彎曲潛變的實驗結果得知,曲度與橢圓化皆會隨著時間的增加而增加,直至皺曲毀損為止,且在較高的預設彎矩值,曲度與橢圓化值增加的較快。由純彎曲鬆弛的實驗結果得知,彎矩會隨著時間迅速的下降,之後漸漸趨近一穩定值,至於橢圓化量則會隨著時間些許的增加後也趨近一穩定值。由於純彎曲鬆弛係固定曲度量因此造成固定的橢圓化量,所以圓管不會發生皺曲損壞。最後,本文修改Lee和Pan[1]所提出的方程式來描述尖銳凹槽316L不鏽鋼管承受純彎曲潛變負載下的起始與第二階段潛變曲度–時間關係及純彎曲鬆弛負載下的鬆弛彎矩–時間關係。在與實驗值比較後發現,理論分析能合理的描述實驗結果。 |
英文摘要 | In this study, the response sharp-notched 316L stainless steel tubes subjected to pure bending creep and relaxation is experimentally and theoretically studied. Pure bending creep means to bend the specimen to a desired moment and hold that moment for a period of time; pure bending relaxation means to bend the specimen to a desired curvature and hold that curvature for a period of time. From the experimental result for pure bending creep, the curvature and ovalization increase with time until the tube buckles. A higher desired moment leads to higher curvature and ovalization. From the experimental result for pure bending relaxation, the bending moment rapidly decreases with time and becomes a steady value after all. As for the ovalization, the amount increases with time and gradually becomes a steady value. Due to the constant ovalization caused by the constant curvature under pure bending relaxation, the tube does not buckle. Finally, the formulation proposed Lee and Pan [1] is modified for simulating the initial and second stages of the creep curvature-time relationship under pure bending creep, and relaxation moment-time relationship under pure bending relaxation for sharp-notched 316L stainless steel tubes. Through comparing with the experimental finding, the theoretical analysis can reasonably describe the experimental result. |
本系統中英文摘要資訊取自各篇刊載內容。