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。

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.