Effect of Pore Structure on Mechanical Properties and Fracture Mechanism of Porous Materials

被引：3
|
作者：
Jia P. [1 ]
Xu X.-T. [1 ]
Huang F. [1 ]
Yang Q.-Y. [1 ]
机构：
[1] School of Resources & Civil Engineering, Northeastern University, Shenyang
来源：
Dongbei Daxue Xuebao/Journal of Northeastern University | 2021年 / 42卷 / 12期
关键词：
Fracture mechanism; Macrocharacteristics; Pore structure; Porous material; RFPA[!sup]3D[!/sup]-CT;
D O I：
10.12068/j.issn.1005-3026.2021.12.014
中图分类号：
学科分类号：
摘要：
In order to study the effect of pore structure on the mechanical properties, fracture mechanism and durability of altered rock porous materials, the uniaxial compression and freeze-thaw cycle experiments were carried out on two types of porous materials with different pore structures. Meanwhile, numerical simulation was conducted to analyze the failure process and failure mechanism of the two porous materials under uniaxial compression. The results show that the pore structure has a significant effect on the mechanical properties of porous materials. The larger the porosity, the lower the compressive strength and the higher the energy absorption. The 10-cycle freeze-thaw experiments in the range of ±25 ℃ show that when the porosity is small and closed, the frost resistance of the material increases due to the particle falling and filling of the pore wall by the freeze-thaw effect, and when the porosity is small, the crack propagation under uniaxial compression mainly extends from both ends of the specimen to the middle of the specimen, forming a continuous main tensile crack with few secondary cracks; when the porosity is large, a large number of microcracks will appear under compression with many secondary cracks. © 2021, Editorial Department of Journal of Northeastern University. All right reserved.
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页码：1768 / 1774
页数：6
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