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題 名 | Fracture Propagation of Anisotropic Plates by the Boundary Element Method=利用邊界元素法探討異向性薄板之裂縫傳播行為 |
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作 者 | 陳昭旭; 柯建仲; | 書刊名 | 中國工程學刊 |
卷 期 | 22:6 1999.11[民88.11] |
頁 次 | 頁741-751 |
分類號 | 440.13 |
關鍵詞 | 邊界元素法; 應力強度因子; 裂縫傳播; 異向性薄板; Boundary element method; Stress intensity factor; Fracture propagation; Anistoropic elasticity; |
語 文 | 英文(English) |
中文摘要 | 本文提出一邊界元素法結合最大張應力破壞準則,針對一具有裂縫之異向性薄板 承受載重,來預測其裂縫初始成長角度,並模擬其裂縫傳播路徑,首先利用邊界元素法與積 分技術可成功求出裂縫尖端之應力強度因子,經由此些因子可進一步計算出裂縫初始成長角 度,根據此角度增加一微小線型元素,如此反覆運算可用以模擬裂縫成長過程。經與前人研 究之實驗結果比較,發現本文所提之邊界元素法過程,可成功模擬異向性薄板之裂縫傳播路 徑。 |
英文摘要 | This paper presents a boundary element method combined with the maximum tensile stree criterion for predicting crack nitiation angles and simulating fracture propagation paths in cracked anisotropic plates under mixed mode loading. Since the calculated displacements near the crack tip by the BEM have been verified to be very accurate, a decoupling technique can be used to determine the mixed mode stress intensity factors based on the definition of the J-integral and the relative displacements at the crack tip. Numerical examples are presented for the calculation of stress intensity factors for both isotropic and anisotropic cases. It can be found that our numerical results are in good agreement with those reported by previous authors. Fracture propagation in an anisotropic plate under mixed mode loading is simulated by an incremental crack extension with a piece-wise linear discretization. A computer program, which can automatically generate a new mesh (required for analyzing sequentially the boundary configuration) has been developed to simulate the fracture propagation process. It was found that the numerical analysis could predict relatively well the direction of crack initiation and the path of fracture propagation. |
本系統中英文摘要資訊取自各篇刊載內容。