多孔材料的孔结构对其力学性能及破裂机制的影响

doi:10.12068/j.issn.1005-3026.2021.12.014

东北大学学报（自然科学版） ›› 2021, Vol. 42 ›› Issue (12): 1768-1774.DOI: 10.12068/j.issn.1005-3026.2021.12.014

多孔材料的孔结构对其力学性能及破裂机制的影响

贾蓬，徐雪桐，黄菲，杨其要

(东北大学资源与土木工程学院，辽宁沈阳110819)

修回日期:2021-02-23 接受日期:2021-02-23 发布日期:2021-12-17
通讯作者: 贾蓬
作者简介:贾蓬(1973-)，女，内蒙古呼和浩特人，东北大学副教授，博士.
基金资助:
国家自然科学基金资助项目(52174071，U1903216，52004052); 中央高校基本科研业务费专项资金资助项目(N180701005).

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

JIA Peng， XU Xue-tong， HUANG Fei， YANG Qi-yao

School of Resources & Civil Engineering， Northeastern University， Shenyang 110819， China.

Revised:2021-02-23 Accepted:2021-02-23 Published:2021-12-17
Contact: JIA Peng
About author:-
Supported by:
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摘要/Abstract

摘要： 针对多孔材料的孔结构对其宏观力学性能及其破裂机制与耐久性的影响，对两种不同孔结构的多孔材料进行了单轴压缩和冻融循环试验，建立了能反映材料内部孔隙结构的三维非均匀数值模型，对两种多孔材料在单轴压缩下的破裂机制进行了分析.实验结果表明:孔结构对于金尾矿多孔材料的力学性能有显著影响.较大的孔隙率除会显著降低材料的抗压强度外，吸能性能会显著增加;在±25℃范围内冻融循环10次条件下的试验结果表明，当金尾矿多孔材料的孔隙率较小且为闭孔结构时，孔洞因冻融造成的孔壁颗粒脱落填塞而造成材料的抗冻性能有所提高;孔隙率较小时，金尾矿多孔材料在单轴压缩下的裂纹扩展主要从试件两端向试件中部扩展贯通为一条连续主拉裂纹，次生裂纹较少;而孔隙率较大时，压缩过程会出现大量微裂纹，最终主裂纹附近会伴随大量次生裂纹.

关键词: 多孔材料;孔结构;宏观特性;破裂机制;RFPA^3D-CT

Abstract: 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.

Key words: porous material; pore structure; macrocharacteristics; fracture mechanism; RFPA^3D-CT

中图分类号:

TU523

贾蓬，徐雪桐，黄菲，杨其要. 多孔材料的孔结构对其力学性能及破裂机制的影响[J]. 东北大学学报（自然科学版）, 2021, 42(12): 1768-1774.

JIA Peng， XU Xue-tong， HUANG Fei， YANG Qi-yao. Effect of Pore Structure on Mechanical Properties and Fracture Mechanism of Porous Materials[J]. Journal of Northeastern University(Natural Science), 2021, 42(12): 1768-1774.

参考文献

[1]Chung S Y，Elerahman M A，Kim J S，et al.Comparison of lightweight aggregate and foamed concrete with the same density level using image based characterizations［J］.Construction and Building Materials，2019，211:988-999.
[2]Batool F，Rafi M M，Bindiganavile V.Microstructure and thermal conductivity of cement based foam:a review［J］.Journal of Building Engineering，2018，20:696-704.
[3]Samson G，Cyr M.Porous structure optimisation of flash calcined metakaolin/fly ash geopolymer foam concrete［J］.European Journal of Environmental & Civil Engineering，2018，22(12):1482-1498.
[4]Kilincarslan S，Davraz M，Akca M.The effect of pumice-as aggregate on the mechanical and thermal properties of foam concrete［J］.Arabian Journal of Geosciences，2018，11(11):289-296.
[5]Falliano D，De Domenico D，Ricciardi G，et al.Experimental investigation on the compressive strength of foamed concrete:effect of curing conditions，cement type，foaming agent and dry density［J］.Construction and Building Materials，2018，165:735-749.
[6]Long W W，Wang J S.Study on compressive strength and moisture content of different grades density of foam concrete［C］//International Conference on Material Science and Applications.Suzhou，2015:167-172.
[7]Othman R，Jaya R P，Muthusamy K，et al.Relation between density and compressive strength of foamed concrete［J］. Materials，2021，14(11):2967.
[8]Geng F，Yin W Y，Xie J G，et al.Quantitative analysis of relationship between pore structure and compressive strength of foamed concrete［J］.Transactions of Nanjing University of Aeronautics and Astronautics，2018，35(3):556-564.
[9]He J，Gao Q，Song X F，et al.Effect of foaming agent on physical and mechanical properties of alkali-activated slag foamed concrete［J］.Construction and Building Materials，2019，226:280-287.
[10]Hilal A A，Thom N H，Dawson A R.On void structure and strength of foamed concrete made without/with additives［J］.Construction and Building Materials，2015，85:157-164.
[11]Nambiar E K，Ramamurthy K.Air-void characterisation of foam concrete［J］.Cement & Concrete Research，2007，37(2):221-230.
[12]Nguyen T T，Bui H H，Ngo T D，et al.Experimental and numerical investigation of influence of air-voids on the compressive behaviour of foamed concrete［J］.Materials & Design，2017，130(sup):103-119.
[13]李志斌，李雪艳.泡沫金属尺寸效应和约束条件下的压缩性能［J］.稀有金属材料与工程，2020，49(9):3203-3208.(Li Zhi-bin，Li Xue-yan.The size effect of foam metal and its compression performance under constrained conditions［J］.Rare Metal Materials and Engineering，2020，49(9):3203-3208.)
[14]Su S L，Rao Q H，He Y H，et al.Effects of porosity on tensile properties of the Ti-Al intermetallic compound porous material［J］.Transactions of Nonferrous Metals Society of China，2020，30(10):2757-2763.
[15]乔吉超，奚正平，汤慧萍，等.金属多孔材料压缩行为的评述［J］.稀有金属材料与工程，2010，39(3):561-564.(Qiao Ji-chao，Xi Zheng-ping，Tang Hui-ping，et al.Comments on the compression behavior of porous metal materials［J］.Rare Metal Materials and Engineering，2010，39(3):561-564.)
[16]王展光，蔡萍，应建中，等.闭孔泡沫铝的力学性能和吸能能力［J］.材料导报，2012，26(10):152-155.(Wang Zhan-guang，Cai Ping，Ying Jian-zhong，et al.The mechanical properties and energy absorption capacity of closed-cell aluminum foam［J］.Materials Review，2012，26(10):152-155.)
[17]Zhu Y，Luo G，Zhang R，et al.Numerical simulation of static mechanical properties of PMMA microcellular foams［J］.Composites Science and Technology，2020，192:108110.
[18]Zhang R，Chen J，Zhu Y，et al.Correlation between the structure and compressive property of PMMA microcellular foams fabricated by supercritical CO₂ foaming method［J］.Polymers，2020，12(2):315.
[19]Kozowski M，Kadela M.Mechanical characterization of lightweight foamed concrete［J］.Materials Science and Engineering，2018，2018:6801258.
[20]Tikalsky P J，Pospisil J，MacDonald W， et al.A method for assessment of the freeze-thaw resistance of preformed foam cellular concrete［J］.Cement and Concrete Research，2004，34(5):889-890.
[21]张后全，唐春安，宋力，等.布孔方式对孔洞材料宏观力学性能影响的研究［J］.应用力学学报，2006，23(1):62-67.(Zhang Hou-quan，Tang Chun-an，Song Li，et al.Study on the influence of hole distribution mode on the macroscopic mechanical properties of porous materials［J］.Chinese Journal of Applied Mechanics，2006，23(1):62-67.)
[22]Zhao W H，Huang J J，Su Q.Models for strength prediction of high-porosity cast-in-situ foamed concrete［J］.Advances in Materials Science and Engineering，2018，2018:3897348.
[23]闻新宇，孙琪，常卓雅，等.蚀变岩型金尾矿制备多孔材料的微观特征及其性能研究［J］.佛山陶瓷，2020，30(3):11-16.(Wen Xin-yu，Sun Qi，Chang Zhuo-ya，et al.Microscopic characteristics and properties of porous materials prepared from altered rock type gold tailings［J］.Foshan Ceramics，2020，30(3):11-16.)
[24]吉布森L J，阿什比M F.多孔固体结构与性能［M］.2版.刘培生译.北京:清华大学出版社，2003.(Gibson L J，Ashby M F.Porous solid structure and properties［M］.2nd ed.Translated by Liu Pei-sheng.Beijing:Tsinghua University Press，2003.)
[25]李升涛，陈徐东，张锦华，等.不同密度等级的泡沫混凝土单轴压缩破坏特征［J/OL］.建筑材料学报(2020-10-28)［2021-05-12］.https://kns.cnki.net/kcms/detail/31.1764.tu.20201028.0949.018.html.(Li Sheng-tao，Chen Xu-dong，Zhang Jin-hua，et al.Failure characteristics of foam concrete with different density under uniaxial compression［J/OL］.Journal of Building Materials(2020-10-28)［2021-05-12］.https://kns.cnki.net/kcms/detail/31.1764.tu.20201028.0949.018.html.)
[26]喻寅，王文强，杨佳，等.多孔脆性介质冲击波压缩破坏的细观机理和图像［J］.物理学报，2012，61(4):483-489.(Yu Yin，Wang Wen-qiang，Yang Jia，et al.Mesoscopic mechanism and image of shock wave compression failure of porous brittle media［J］.Acta Physica Sinica，2012，61(4):483-489.)
[27]郎颖娴，梁正召，段东，等.基于CT试验的岩石细观孔隙模型重构与并行模拟［J］.岩土力学，2019，40(3):1204-1212.(Lang Ying-xian，Liang Zheng-zhao，Duan Dong，et al.Reconstruction and parallel simulation of rock meso-pore model based on CT test［J］.Rock and Soil Mechanics，2019，40(3):1204-1212.)

多孔材料的孔结构对其力学性能及破裂机制的影响

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

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