Study on Fracture Simulation Method of Brittle Material with Distinct Model

脆性材料离散模型断裂模拟方法研究

• 批准号: 11450205
• 负责人: MORI Hiroshi
• 金额: $ 5.12万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B).
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11450205/
• 关键词: Failure Analysis; Constitutive Law; Visco-elasto-plastic Suspension Element Method; Delauney Triangulation; Frictional Yielding; Large Deformation Analysis; Acoustic Emission; Simulation

The results obtained in this research are summarized as follows :1. The visco-elasto-plastic suspension element method for the fracture analysis was developed. Delauney triangulation was adopted to VEPSEM for the sake of stabilized numerical analysis with random placed nodal points, and repetitive loading was considered by the displacement control of the loading boards. Furthermore, in order to simulate the fracture of porous concrete, the arbitrary radius of suspension elements was set independently from the radii of the aggregate nodes concerned with the element.2. The stress-strain curves and the progress of fracture of two dimensional concrete specimens were simulated and discussed under various conditions of loading speed, shape and size of specimen, and position of coarse aggregate. Furthermore, the stress-strain curves of confined concrete were also simulated and discussed.3. The elastic wave of acoustic emission by local fracture of concrete were simulated and discussed from the view points of the difference between tensile and shear fracture and the mechanism of Kaiser effect. The phenomena of acoustic emission were simulated adequately.4. The fractures of porous concrete were simulated. As the result, it was clarified that there are no differences between the progress of simulational fracture of porous concrete and solid concrete, and the relationship between compressive strength and void ratio of the simulational results has same tendency from previous experimental study.

在这项研究中获得的结果总结如下：1。开发了用于断裂分析的Visco弹塑性悬浮元件方法。为了进行稳定的数值分析，将Delauney三角剖分用于VEPSEM，并随机放置的节点点，并通过负载板的位移控制来考虑重复负载。此外，为了模拟多孔混凝土的断裂，悬浮元件的任意半径是独立于与该元素有关的聚集点淋巴结的半径设置的。2。在各种载荷速度，样品的形状和大小以及粗骨料的位置下，模拟并讨论了应力 - 应变曲线和二维混凝土样品的断裂进展。此外，还模拟并讨论了约束混凝土的应力 - 应变曲线3。通过局部断裂的弹性波发射，并从拉伸和剪切裂缝之间的差异以及kaiser效应的机理中进行了模拟并讨论。充分模拟声发射现象4。模拟了多孔混凝土的断裂。结果，澄清说，多孔混凝土和固体混凝土的模拟骨折进展与抗压强度与模拟结果的空隙之比之间的关系与以前的实验研究相同。

项目成果

平岩陸: "コンファインドコンクリートのせん断変形・破壊挙動に関する解析的研究"日本建築学会構造系論文集. No.540. 13-18 (2001)

Riku Hiraiwa：“混凝土的剪切变形和断裂行为的分析研究”日本建筑学会结构工程学报第540号（2001年）。

平岩陸: "圧縮繰返し応力を受けるコンクリートの変形挙動に関する解析的研究"材料. Vol.48,No.8. 864-869 (1999)

Riku Hiraiwa：“循环压缩应力下混凝土变形行为的分析研究”材料，第 48 卷，第 864-869 期。

Hiraiwa, T., Tanigawa, Y., Mori, H.and Kawato, K.: "Analysis of Compressive Fracture of Concrete by Visco-Elasto-Plastic Suspension Element Method using Delaunay Triangulation"Trans. of JCI. Vol.22. 85-92 (2000)

Hiraiwa, T.、Tanikawa, Y.、Mori, H. 和 Kawato, K.：“使用 Delaunay 三角剖分的粘弹塑性悬挂单元法分析混凝土压缩断裂”Trans。

平岩陸: "コンファインドコンクリートの強度および変形挙動に関する解析的研究"日本建築学会構造系論文集. No.528. 1-6 (2000)

Riku Hiraiwa：“约束混凝土的强度和变形行为的分析研究”日本建筑学会结构工程第 528 期（2000 年）。

Ohtsuka, K., Tanigawa, Y., Mori, H., Kurokawa, Y., Hiraiwa, T.and Park, S.J.: "Failure Analysis of Porous Concrete by Visco-Elasto-Plastic Suspension Element Method"Proc. of AIJ Tokai Chapter Architecural Research Meeting. No.39. 89-92 (2001)

Ohtsuka, K.、Tanikawa, Y.、Mori, H.、Kurokawa, Y.、Hiraiwa, T. 和 Park, S.J.：“粘弹塑性悬浮单元法对多孔混凝土的破坏分析”Proc。