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題 名 | 三維球形顆粒堆積體之運動行為分析=A Motion Analysis Model for 3D Ball Congregated Medium |
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作 者 | 王仲宇; 李承恩; 盛若磐; | 書刊名 | 力學 |
卷 期 | 14:2 1998.12[民87.12] |
頁 次 | 頁93-107 |
分類號 | 440.2 |
關鍵詞 | 顆粒介質; 圓球; 組構; 接觸; 堆積; Granular medium; Sphere; Fabric; Contact; Packing; |
語 文 | 中文(Chinese) |
中文摘要 | 本論本基於離散元素法之精神,提出一可模擬三維球形顆粒介質體變形分析之數 值模擬程序-DYNABALL,分析架構中之各顆粒不論其尺寸皆為具有六個自由度之剛性球 體,顆粒與邊界或顆粒彼此間之互制力則運用正向及剪力彈簧機制進行模擬,並使用顯性時 間積分法進行求解,且提出了球體與邊界面、邊界線及邊界點間之接觸判斷法則。分析程式 的準確性可透過能量及動量守恆定律進行驗證。整體程序並配以電腦繪圖之功能,可將分析 域中各質點之三維運動軌跡及分布情形做適當之輸出顯示之協助分析工作之進行。 |
英文摘要 | In the paper, a new computational code named :DYNABALL" is developed based on the discrete element method to efficiently predict the mechanical behaviors of spherical shaped granular congregated media. In the frame of this newly presented model, granules or powders are modeled by rigid balls with different sizes and six degress of freedom are allocated to each ball element. The mutual reactions among elements are taken into account by the relative forces and contact through normal and shear spring models. The explicit time integration scheme is applied to slove the dynamic equations of each particel. Some contact detection algorithms for the ball contacting with the corner points and with the intersection lines of the surfaces of the container are proposed. The capabilities and accuracy of the simulation results are verified by the comparisons with some benchmark problems. This DYNABALL code with graphic display functions can be applied to study many three dimensional, dynamic (or static), large deformation problems of engineering systems consisted of spherical particles. |
本系統中英文摘要資訊取自各篇刊載內容。