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.

本研究取得的成果概括如下： 1．开发了用于断裂分析的粘弹塑性悬挂单元方法。 VEPSEM 采用 Delauney 三角剖分，以实现随机放置节点的稳定数值分析，并通过加载板的位移控制来考虑重复加载。此外，为了模拟多孔混凝土的断裂，悬挂单元的任意半径的设置与单元相关骨料节点的半径无关。 2．模拟讨论了不同加载速度、试件形状和尺寸、粗骨料位置等条件下二维混凝土试件的应力应变曲线和断裂进展情况。此外，还对约束混凝土的应力应变曲线进行了模拟和讨论。 3．对混凝土局部断裂声发射的弹性波进行了模拟，从拉伸断裂与剪切断裂的区别以及Kaiser效应的机理等角度进行了讨论。对声发射现象进行了充分的模拟； 4．对多孔混凝土的断裂进行了模拟。结果表明，多孔混凝土和实心混凝土的模拟断裂进展没有差异，模拟结果的抗压强度与空隙率之间的关系与之前的试验研究具有相同的趋势。

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。

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。

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）。