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Field Sensing Characteristic Research of Carbon Fiber Smart Material

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Journal of Wuhan University of Technology(Materials Science) 2015年第5期30卷 914-917页

作者：张小玉吕泳 CHEN Jianzhong li zhuoqiu School of Science Wuhan University of Technology

In order to research the field sensing characteristic of the carbon fiber smart material, the Tikhonov regularization principle and the modified Newton-Raphson(MNR) algorithm were adopted to solve the inverse problem of the electrical resistance tomography(ERT). An ERT system of carbon fiber smart material was developed. Field sensing characteristic was researched with the experiment. The experimental results show that the specific resistance distribution of carbon fiber smart material is highly consistent with the distribution of structural strain. High resistance zone responds to high strain area, and the specific resistance distribution of carbon fiber smart material reflects the distribution of sample strain in covering area. Monitoring by carbon fiber smart material on complicated strain status in sample field domain is realized through theoretical and experimental study.

关键词： carbon fiber smart material field sensing characteristic piezoresistivity image reconstruction electrical resistance tomography

Mechanism of Functional Responses to Loading of Carbon Fiber Reinforced Cement-based Composites

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Journal of Wuhan University of Technology(Materials Science) 2008年第4期23卷 571-573页

作者： JIANG Cuixiang li zhuoqiu SONG Xianhui LU Yong College of Science Wuhan University of Science and Technology Wuhan 430065 China School of Science Wuhan University of Technology Wuhan 430070 China

Single fiber pull-out testing was conducted to study the origin of the functional responses to loading of carbon fiber reinforced cement-based composites. The variation of electrical resistance with the bonding force on the fiber-matrix interface was measured. Single fiber electromechanical testing was also conducted by measuring the electrical resistance under static tension. Comparison of the results shows that the resistance increasing during single fiber pull-out is mainly due to the changes at the interface. The conduction mechanism of the composite can be explained by the tunneling model. The interfacial stress causes the deformation of interfacial structure and the interfacial debonding, which have influences on the tunneling effect and result in the change of resistance.

关键词： carbon fiber functional response tunneling effect single pull-out cement

Prediction of Viscoelastic Behavior of Unidirectional Polymer Matrix Composites

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Journal of Wuhan University of Technology(Materials Science) 2016年第3期31卷 695-699页

作者：张小玉 HUANG Qianyu 陈建中 li zhuoqiu School of Science Wuhan University of TechnologyWuhan 430070China Wuhan Boiler Group Chaoshun Boiler Equipment Manufacture Co. LtdWuhan 430070China

To develop a novel method predicting the viscoelastic behavior of polymer matrix composites according to the viscoelasticity of the matrix, we used the viscoelastic model of the matrix to build new models for unidirectional composites in both 0° and 90° directions. Viscoelastic parameters for both new models were derived, and the obtained equations shared the same form as the viscoelastic constitutive equation of matrix material. The viscoelastic behaviors of matrix material and unidirectional composites were also tested. Results showed that fitting parameters of creep compliance equation were close to the theoretical values of viscoelastic constitutive parameters of the unidirectional composites, proving the validity of the models. A new method was obtained to predict the viscoelastic property of the unidirectional composites based on the viscoelastic property of composite matrix and elastic property of the unidirectional composites. This method provides a theoretical basis for future studies on the viscoelasticity of composite laminates.

关键词： viscoelastic model polymer matrix composites creep microscopic-mechanical models long-term behavior

ELECTRO-THERMAL EFFECTS AND DEFORMATION RESPONSE OF CARBON FIBER MAT CEMENT BEAMS

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Acta Mechanica Solida Sinica 2003年第4期16卷 359-365页

作者： Zhu Sirong li zhuoqiu Song Xianhui (Department of Engineering Structures and Mechanics,Wuhan University of Technology,Wuhan 430070,China) Department of Engineering Structures Wuhan University of Technology Wuhan 430070 China

A carbon fiber mat is a sheet composed of intercrossing short carbon fibers,which has more stable and lower electrical resistivity compared with dispersed short carbon fiber mixed in *** carbon fiber mat cement could exhibit obvious electro-thermal *** electrified,the temperature of composite structures made up of cement mortar and carbon fiber mat will rise *** the temperature field is not uniform,temperature difference will cause structures to deform,which can be used to adjust the deformation of *** temperature field and deformation response driven by the electro-thermal effects of a type of carbon fiber mat cement beams are ***,the temperature and deformation responses are studied using theories of thermal conduction and ***,experimental results are given to verify the theoretical *** two parts lay the foundation for temperature and deformation adjustment.

关键词： carbon fiber mat cement electro-thermal effect deformation response

Deformation Resistance Effect of PAN-based Carbon Fibers

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Journal of Wuhan University of Technology(Materials Science) 2009年第3期24卷 415-417页

作者：郑立霞 School of Science Wuhan University of Technology

The deformation resistance effect of polyacrylonitrile （PAN）-based carbon fibers was investigated, and the variatipn law of electrical resistivity under tensile stress was analyzed. The results show that the gauge factor （fractional change in resistance per unit strain） of PAN-based carbon fibers is 1.38, which is lower than that of the commonly-used resistance strain gauge. These may due to that the electrical resistivity of carbon fibers decreases under tensile stress. In addition when the carbon fibers are stretched, the change of its resistance is caused by fiber physical dimension and the change of electric resistivity, and mainly caused by the change of physical dimension. The mechanical properties of carbon fiber monofilament were also measured.

关键词： PAN-based carbon fibers resistance strain gauge factor

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三维海洋波导中多声散射的数值解

计算物理 2008年第2期25卷 191-196页

作者：潘文峰李卓球武汉理工大学理学院湖北武汉430070

研究三维海洋波导中多障碍物的声散射问题.基于Galerkin变分原理和DtN映射方法,发展一种自然边界元与有限元耦合的求解方法,提出有效的数值实现方法,避免常规有限元中需要采用吸收边界的缺点.对多种形状多障碍物的数值计算结果表明,所... 详细信息

研究三维海洋波导中多障碍物的声散射问题.基于Galerkin变分原理和DtN映射方法,发展一种自然边界元与有限元耦合的求解方法,提出有效的数值实现方法,避免常规有限元中需要采用吸收边界的缺点.对多种形状多障碍物的数值计算结果表明,所建立的理论方法是有效的.

关键词：海洋波导多目标声散射有限元自然边界元

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浅海波导赫姆霍茨方程外问题多尺度有限元法

华中科技大学学报（自然科学版） 2008年第5期36卷 118-121页

作者：潘文峰李卓球武汉理工大学理学院湖北武汉430070

研究了二维多尺度海洋波导中声波与散射体相互作用的问题.将海洋波导中散射体的声散射问题分解为两个外问题和一个内问题进行求解,外问题和内问题的解通过在人工边界上的DtN映射耦合,建立了相应的DtN映射.通过DtN映射,把赫姆霍茨方程在... 详细信息

研究了二维多尺度海洋波导中声波与散射体相互作用的问题.将海洋波导中散射体的声散射问题分解为两个外问题和一个内问题进行求解,外问题和内问题的解通过在人工边界上的DtN映射耦合,建立了相应的DtN映射.通过DtN映射,把赫姆霍茨方程在无限长带状区域中的定解问题,转化为在一个有限区域中的定解问题.基于伽辽金变分和DtN映射方法,发展了数值求解这类声散射问题的一种多尺度有限元求解方法,提出了有效的数值实现手段.数值计算结果表明了所建立的有限元理论方法是有效和实用的,而且它的数值实现是很快速的.

关键词：海洋波导声散射多尺度有限元自然边界赫姆霍茨方程

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混凝土结构层间力学性能的电学表征

华中科技大学学报（自然科学版） 2007年第4期35卷 103-105页

作者：朱四荣李卓球宋显辉武汉理工大学理学院湖北武汉430070

以由碳纤维布作为界面层的混凝土及碳纤维混凝土为例,根据混凝土层间接触电阻的变化,对剪切荷载及弯曲荷载作用下的混凝土界面粘接性能及剪切强度进行电学参数变化实验.实验结果表明:素混凝土层间接触电阻随着层间粘接松动而增大,当发... 详细信息

以由碳纤维布作为界面层的混凝土及碳纤维混凝土为例,根据混凝土层间接触电阻的变化,对剪切荷载及弯曲荷载作用下的混凝土界面粘接性能及剪切强度进行电学参数变化实验.实验结果表明:素混凝土层间接触电阻随着层间粘接松动而增大,当发生粘接破坏时,则急剧增大;碳纤维混凝土层间接触电阻随着剪切强度的增大而增大,发生剪切破坏时,则急剧增大;碳纤维混凝土层间接触电阻的敏感性比素混凝土层间接触电阻对界面粘接及剪应力的敏感性要好,低应力作用下,碳纤维混凝土层间接触电阻随应力明显变化.

关键词：混凝土结构力学性能碳纤维(毡) 电学表征

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日光直射下混凝土梁的力学响应

华中科技大学学报（自然科学版） 2005年第4期33卷 93-96页

作者：朱四荣李卓球宋显辉武汉理工大学理学院湖北武汉430070

依据热量平衡原理建立混凝土梁结构在等强度日光直射下的瞬态热传导数学模型,依据此模型导出其内部温度场的解析解,由此得到日光直射下混凝土梁在任意时刻的温度分布.通过弹性理论由位移法求解得出梁在该温度场下的温度应力及热变形响应... 详细信息

依据热量平衡原理建立混凝土梁结构在等强度日光直射下的瞬态热传导数学模型,依据此模型导出其内部温度场的解析解,由此得到日光直射下混凝土梁在任意时刻的温度分布.通过弹性理论由位移法求解得出梁在该温度场下的温度应力及热变形响应,分析了温度应力随日光照射时间的变化;为验证数学模型的有效性,进行了日光照射模拟实验,采用碳纤维混凝土涂层梁的电热效应使梁内温度场发生变化,并将梁上下表面的温差及梁跨中挠度与模拟实验结果进行了比较;分析了混凝土材料的导热系数对温度应力和变形的影响,由此结果说明可以通过提高混凝土材料的导热系数来减小日照引起的温度应力及变形.

关键词：混凝土梁日光直射温度场力学响应