RESEARCH ON AIR-COUPLED ULTRASONIC EVALUATION METHOD FOR DYNAMIC VISCOELASTICITY OF CONCRETE
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- 英文论文题名：RESEARCH ON AIR-COUPLED ULTRASONIC EVALUATION METHOD FOR DYNAMIC VISCOELASTICITY OF CONCRETE
- 论文作者：Jun-jie CHANG ; Juan-juan LI
- 英文论文作者：Jun-jie CHANG ; Juan-juan LI ; Key Lab of Nondestructive Testing ; Ministry of Education ; Nanchang Hangkong University ; Japan probe Corporation
- 年：2016
- 作者机构：Key Lab of Nondestructive Testing, Ministry of Education,Nanchang Hangkong University;Japan probe Corporation;
- 英文论文关键词：Piezoelectric motor ; Single vibrator ; Bidirectional rotation ; Ultrasonic motor
- 会议召开时间：2016-10-21
- 会议录名称：2016年全国压电和声波理论及器件应用研讨会论文摘要集
- 英文会议录名称：Abstract Book of 2016 Symposium on Piezoelectricity, Acoustic Waves and Device Applications
- 语种：英文
- 分类号：TU528;TB559
- 学会代码：AGLU
- 会议名称：2016年全国压电和声波理论及器件应用研讨会
- 会议地点：中国陕西西安
- 主办单位：中国力学学会、中国声学学会、IEEE UFFC分会
- 学会名称：中国力学学会
- 页数：1
- 文件大小：9k
- 原文格式：D
- 会议级别：全国
摘要
Background, Motivation and Objective Concrete is a classic viscoelastic material, damping mechanism of which are affected greatly by viscoelastic properties. The viscoelasticity of the material is one of the mechanical properties of the damping mechanism. The elasticity of the material can cause the attenuation and scattering of the ultrasonic, the viscosity can cause the loss of energy. The static and dynamic viscoelastic are two different evaluation methods for the viscoelastic concrete material, respectively. The concrete is in a dynamic external pressure environment, so the dynamic mechanical properties compared with the static mechanical properties can reflect the performance of concrete in service. Statement of Contribution/Methods The paper presents the method for solving the ultrasonic attenuation coefficient, phase velocity and loss tangent value in the concrete according to the basic theory of viscoelastic properties, air-coupled ultrasonic testing and using loss angle tangent value as the evaluation parameter. The evaluation results of concrete dynamic viscoelastic are provided. Results The deformation, loss tangent increases and the proportion of the loss modulus increases with increasing of damage the concrete inside, but storage modulus decreased. Discussion and Conclusions The viscoelastic parameters of the concrete can be obtained; the change of concrete internal damage is monitored using the air coupling penetration method. Both of the concrete viscoelastic and concrete damage are considered, which provides a new method for concrete nondestructive.
Background, Motivation and Objective Concrete is a classic viscoelastic material, damping mechanism of which are affected greatly by viscoelastic properties. The viscoelasticity of the material is one of the mechanical properties of the damping mechanism. The elasticity of the material can cause the attenuation and scattering of the ultrasonic, the viscosity can cause the loss of energy. The static and dynamic viscoelastic are two different evaluation methods for the viscoelastic concrete material, respectively. The concrete is in a dynamic external pressure environment, so the dynamic mechanical properties compared with the static mechanical properties can reflect the performance of concrete in service. Statement of Contribution/Methods The paper presents the method for solving the ultrasonic attenuation coefficient, phase velocity and loss tangent value in the concrete according to the basic theory of viscoelastic properties, air-coupled ultrasonic testing and using loss angle tangent value as the evaluation parameter. The evaluation results of concrete dynamic viscoelastic are provided. Results The deformation, loss tangent increases and the proportion of the loss modulus increases with increasing of damage the concrete inside, but storage modulus decreased. Discussion and Conclusions The viscoelastic parameters of the concrete can be obtained; the change of concrete internal damage is monitored using the air coupling penetration method. Both of the concrete viscoelastic and concrete damage are considered, which provides a new method for concrete nondestructive.
Background, Motivation and Objective Concrete is a classic viscoelastic material, damping mechanism of which are affected greatly by viscoelastic properties. The viscoelasticity of the material is one of the mechanical properties of the damping mechanism. The elasticity of the material can cause the attenuation and scattering of the ultrasonic, the viscosity can cause the loss of energy. The static and dynamic viscoelastic are two different evaluation methods for the viscoelastic concrete material, respectively. The concrete is in a dynamic external pressure environment, so the dynamic mechanical properties compared with the static mechanical properties can reflect the performance of concrete in service. Statement of Contribution/Methods The paper presents the method for solving the ultrasonic attenuation coefficient, phase velocity and loss tangent value in the concrete according to the basic theory of viscoelastic properties, air-coupled ultrasonic testing and using loss angle tangent value as the evaluation parameter. The evaluation results of concrete dynamic viscoelastic are provided. Results The deformation, loss tangent increases and the proportion of the loss modulus increases with increasing of damage the concrete inside, but storage modulus decreased. Discussion and Conclusions The viscoelastic parameters of the concrete can be obtained; the change of concrete internal damage is monitored using the air coupling penetration method. Both of the concrete viscoelastic and concrete damage are considered, which provides a new method for concrete nondestructive.
引文