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題 名 | Rupture Analysis of a Nonlinear Viscous Tube with Stress Concentration=厚壁壓力管之潛變破裂分析 |
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作 者 | 劉勝安; | 書刊名 | 大葉學報 |
卷 期 | 4:1 1995.12[民84.12] |
頁 次 | 頁37-48 |
分類號 | 440.12 |
關鍵詞 | 破裂; 潛變損壞; 應變控制; 破裂傳播; Rupture; Creep damage; Strain-controlled; Ruptue propagation; |
語 文 | 英文(English) |
中文摘要 | 研究以局部連續損壞之概念配合有限單元數值解法對句外缺口之厚壁壓力管進行潛變及破裂行為分析。在分析中,吾人以一應變控制損壞率計算由潛變累積所造成之各局部損壞量,而當局不損壞量達到材料所能承受之限度值十級假設該局不知破裂已經發生,邊界條件便隨時間改變,而形成一所謂 “一定邊界值問題”。在有限單元求解過程中,吾人採用一特殊之步驟用以模擬實際之破裂現象,而獲得一近似解。而由於外缺口之存在,使得管中之潛便損壞產生局部化之分佈,至產生局部破裂,進而向外傳播,直到完全破裂為止。 |
英文摘要 | The creep rupture behavior of an externally-notched thick-walled tube is investigated in details based on the local continuum damage mechanics approach. Ageneralized strain-controlled damage law is used to evaluate the damage due to creep for which local rupture is assumed to have occurred when creep damage reached a material-dependent critical value. As rupture occurs, the boundary of the associated boundary-value problem moves with time. In the analysis, a particular finite element simulation procedure for the creep rupture process is employed to obtain an approximate numerical solution. Due to the existing notch and hence the severe nonuniform damage accumulation, local rupture develops at various locations and then propagates through the tube thickness simultaneously, leading to a complete failure. |
本系統中英文摘要資訊取自各篇刊載內容。