超声波三轴压缩试验机及其应用
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摘要
在单轴压缩试验机的基础上研制了一套超声波三轴压缩试验系统,实现了三轴压缩过程中超声波的全程测试。对一组混凝土试样进行了试验研究,采用小波分析对超声波数据进行处理。在频域范围内提出了三个能反映试样中损伤演化的特征量:归一化第一能量峰值、归一化第二能量峰值、第一能量峰值对应的尺度。本文为研究损伤本构关系提供了新的设备,提出的三个特征量能够反映材料内部结构的变化,特别是第三个特征量具有较强的规律性,可以作为描述材料结构变化的损伤变量。
A new triaxial equipment combined with ultrasonic apparatus was developed.The structural change of samples during triaxial compression tests was measured by ultrasonic techniques.A series of tests for concrete samples were conducted and the ultrasonic data were analyzed using wavelet.Three characteristic values which could reflect damage evolution of samples were put forward in frequency range.They were the first normalization peak value of energy,the second normalization peak value of energy and the scale corresponding to the first normalization peak value of energy.These three characteristic values could reflect the inside structure change of materials.Especially,the third characteristic value had good regularity and could be used as damage variable.
A new triaxial equipment combined with ultrasonic apparatus was developed.The structural change of samples during triaxial compression tests was measured by ultrasonic techniques.A series of tests for concrete samples were conducted and the ultrasonic data were analyzed using wavelet.Three characteristic values which could reflect damage evolution of samples were put forward in frequency range.They were the first normalization peak value of energy,the second normalization peak value of energy and the scale corresponding to the first normalization peak value of energy.These three characteristic values could reflect the inside structure change of materials.Especially,the third characteristic value had good regularity and could be used as damage variable.
引文
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[10]梁菁,史亦韦,韩波.粉末冶金制件中孔隙的超声评价[J].无损检测,1999,21(1):17–20.(LIANG Qing,SI Yi-wei,HAN Po.Ultrasonic evaluation on voids in the material made from powder metallurgy[J].Non-damage Monitoring Techniques,1999,21(1):17–20.(in Chinese))
[11]QUAN You-li,HARRIS Jerry M.Seismic attenuation tomography using the frequency shift method[J].Geophysics,1997,62(3):895–905.
[12]王宝善,孙道远,李生杰.岩石非均匀性对超声衰减的影响及其修正[J].中国地震,2001,17(1):1–7.(WANG Bao-shan,SUN Dao-yuan,LI Sheng-jie.Effect of rock nonhomogenous on ultrasonic attenuation and its modifying[J].China Earthquake,2001,17(1):1–7.(in Chinese))
[2]Livermore Software Technology Corpoation.LS-DYNA Theortical Manual[R].1998.
[3]杨更社,张长庆.岩体损伤及检测[M].陕西:陕西科学技术出版社,1998.(YANG Geng-she,ZHANG Chang-qing.damage of rock mass and its measurement[M].Xi’an:Shaanxi Science and Technology Press,1998.(in Chinese))
[4]葛修润,任建喜,蒲毅彬,等.煤岩三轴细观损伤演化规律的CT动态试验[J].岩石力学与工程学报,1999,18(5):497–502.(GE Xiu-run,REN Jian-xi,PU Yi-bin,et al.Dynamical CT triaxial test on damage evolution law of coal-rock mesostructure[J].Chinese J of Rock Mechanics and Engineering,1999,18(5):497–502.(in Chinese))
[5]陈正汉,卢再华,蒲毅彬.非饱和土三轴仪的CT机配套及其应用[J].岩土工程学报,2001,23(4):387–392.(CHEN Zheng-han,LU Zai-hua,PU Yi-bin.The matching of computerized tomography with triaxial test apparatus for unsaturated soils[J].Chinese J of Geotechnical Engineering,2001,23(4):387–392.(in Chinese))
[6]国家建筑工程质量监督检验中心.混凝土无损检测技术[M].北京:中国建材工业出版社,1996.(National Monitoring Center of Building Engineering Quantity.Non-damage monitoring techniques of concrete[M].Beijing:China Architecture and Building Press,1996.(in Chinese))
[7].FAIRHURST C E,HUDSON J A.单轴压缩试验测定完整岩石应力–应变全曲线ISRM建议草案[J].岩石力学与工程学报,2000,19(6):802–808.(FAIRHURST C E,HUDSON J A.Suggestion on measuring whole stress-strain curve of rock sample for uniaxial compression test[J].Chinese J of Rock Mechanics and Engineering,2000,19(6):802–808.(in Chinese))
[8]张学成.断裂力学在焊缝超声波探伤中的应用[J].无损检测,1996,18(4):99–101.(ZHANG Xue-cheng.Application of fracture mechanics in ultrasonic probing of weld seam[J].Non-damage Monitoring Techniques,1996,18(4):99–101.(in Chinese))
[9]赵明阶,徐蓉.岩石损伤特性与强度的超声波速研究[J].岩土工程学报,2000,22(6):720–722.(ZHAO Ming-jie,XU Rong.Research on ultrasonic velocity of damage characteristics and strength of rock[J].Chinese J of Geotechnical Engineering,2000,22(6):720–722.(in Chinese))
[10]梁菁,史亦韦,韩波.粉末冶金制件中孔隙的超声评价[J].无损检测,1999,21(1):17–20.(LIANG Qing,SI Yi-wei,HAN Po.Ultrasonic evaluation on voids in the material made from powder metallurgy[J].Non-damage Monitoring Techniques,1999,21(1):17–20.(in Chinese))
[11]QUAN You-li,HARRIS Jerry M.Seismic attenuation tomography using the frequency shift method[J].Geophysics,1997,62(3):895–905.
[12]王宝善,孙道远,李生杰.岩石非均匀性对超声衰减的影响及其修正[J].中国地震,2001,17(1):1–7.(WANG Bao-shan,SUN Dao-yuan,LI Sheng-jie.Effect of rock nonhomogenous on ultrasonic attenuation and its modifying[J].China Earthquake,2001,17(1):1–7.(in Chinese))
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