[1]巩妮娜,胡少伟,范向前,等.混凝土I-II复合型断裂过程声发射特征研究[J].防灾减灾工程学报,2019,39(01):171-179.[doi:10.13409/j.cnki.jdpme.2019.01.024]
 GONG Nina,HU Shaowei,FAN Xiangqian,et al.Study on Acoustic Emission Characteristics during I-II Mixed Mode Fracture Process in Concrete[J].Journal of Disaster Prevention and Mitigation Engineering,2019,39(01):171-179.[doi:10.13409/j.cnki.jdpme.2019.01.024]
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混凝土I-II复合型断裂过程声发射特征研究()
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防灾减灾工程学报[ISSN:1672-2132/CN:32-1695/P]

卷:
39卷
期数:
2019年01期
页码:
171-179
栏目:
论文
出版日期:
2019-02-28

文章信息/Info

Title:
Study on Acoustic Emission Characteristics during I-II Mixed Mode Fracture Process in Concrete
文章编号:
1672-2132(2019)01-0171-09
作者:
巩妮娜12 胡少伟13 范向前3王 强1 王 阳3
1.河海大学力学与材料学院,江苏 南京 210098; 2.淮海工学院土木与港海工程学院,江苏 连云港 222005; 3.南京水利科学研究院材料结构研究所,江苏 南京 210024
Author(s):
GONG Nina12 HU Shaowei 13 FAN Xiangqian3 WANG Qiang1 WANG Yang3
1.College of Mechanics and Materials, Hohai University, Nanjing 210098, China; 2.College of Civil, Harbor and Coastal Engineering, Huaihai Institute of Technology, Lianyungang 222005, China; 3.Department of Materials and Structural Engineering,Nanjing Hydraulic Resarch Institute, Nanjing 210024, China
关键词:
混凝土 I-II复合型断裂 裂缝偏移比 声发射参量 相关系数
Keywords:
concrete I-II mixed mode fracture notch offset ratio acoustic emission(AE)parameters correlation coefficients
分类号:
TD82
DOI:
10.13409/j.cnki.jdpme.2019.01.024
文献标志码:
A
摘要:
通过对不同位置预制裂缝的混凝土三点弯曲梁进行声发射试验,开展了不同预制裂缝偏移比下混凝土I-II复合型断裂的声发射过程参数、状态参数、统计参数分布规律,以及参数间相关性研究。结果表明:振铃计数—时间曲线、能量释放率—时间曲线的突变可表征I-II复合型断裂过程的临界状态,随着预制裂缝偏移比的增大,峰值荷载增大,试件脆断性增强; 部分声发射过程参数间具有高度或中度相关性; 随着裂缝偏移比的增大,试件起裂阶段主频均以低频占优,失稳阶段主频呈现“高—低”趋势。该研究可为混凝土损伤状态判别提供一定基础。
Abstract:
Acoustic emission(AE)experiments were carried out for three-point bending beams with notch in different positions.The AE process parameters, state parameters, statistical parameters and the correlation between partial AE parameters were study for I-II mixed mode fracture process of concrete beams with notch in different positions.Results showed that the critical state of I-II mixed mode fracture process can be characterized by mutation information of the ringing counts-time curves and energy release rate-time curves.With the increase of notch offset ratio, maximum load increased gradually, and the characteristics of brittle fracture for specimen was obvious.There was high correlation or moderate correlation between partial AE process parameters.With the increase of notch offset ratio,the dominant frequency was low frequency at initial fracture moment, and the dominant frequency had a trend of “high-low” at the unstable fracture moment.This study can provide a basis for determining the damage state of concrete.

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备注/Memo

备注/Memo:
收稿日期:2018-06-07; 修回日期:2018-07-20 基金项目:国家重点研发计划(2016YFC0401907)、国家自然科学基金(51679150; 51879168)、国家重大科研仪器研制项目(51527811)、江苏省高等学校自然科学研究面上项目(16KJB570001)资助 作者简介:巩妮娜(1981-),女,讲师,博士研究生。主要从事混凝土损伤断裂研究。Email:58816236@qq.com 通讯简介:胡少伟(1969-),男,教授,博导,博士。主要从事水工结构工程与材料研究。E
更新日期/Last Update: 2019-02-20