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요약정보
混凝土骨料粒径对声发射信号衰减特性影响
Resource Type
Academic Journal
Authors
虞爱平
;
丁俊业
;
陈哲涵
;
张露
;
陈涛
;
陈宣东
Source
河南科技大学学报(自然科学版) / Journal of Henan University of Science & Technology(Natural Science)
. 44(3):54-60
Subject
混凝土
骨料粒径
声发射
衰减特性
Language
Chinese
ISSN
1672-6871
Online Access
Find it @ DONGA
초록
针对混凝土材料声发射信号衰减特性问题,探究了不同组分对声发射信号的衰减变化规律.选用不同骨料粒径(5~10 mm、10~15 mm和15~20 mm)混凝土试件进行断铅试验,研究分析声发射信号幅值、中心频率、波速等参数变化.结果表明:品质因子Q与波阻抗具有较好的相关性,15~20 mm骨料粒径混凝土试件的品质因子Q和波阻抗最小,声发射信号衰减最大.随着传播距离的增加,弹性波的幅值、中心频率、峰值电压均呈衰减趋势.混凝土骨料粒径越大,其幅值和中心频率的衰减系数越大,声发射信号衰减越明显,各频段信号衰减越快,信号频带变得越窄,其基准波速越小,波速衰减变化越大.当弹性波传播到900 mm距离处时,5~10 mm、10~15 mm和15~20 mm粒径试件的波速变化率分别为-33.85%、-34.88%和-35.91%.
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