超声法研究多孔介质的力学性能
毕业论文关键词：多孔介质；孔隙率 ；超声波波速 ；弹性模量 ；剪切模量
Abstract In production and living, metal foam, sintered ceramic artificial, hollow concrete and other porous materials have a wide range of applications in heat insulation, sound insulation, impact energy absorption, suppress vibration, air and water filtration. Porosity is important microstructural parameters on affecting the basic physical properties of porous media and the mechanical properties is an important indicator to evaluate and choose materials. It is an important research topic to analyzing the testing method of mechanical properties of porous media and how the porous medium porosity affects the mechanical properties of materials. Based on the theoretical basis of the relevant elastic dynamics the propagation characteristics of ultrasonic longitudinal and shear waves in the materials have closely related to the elastic modulus and shear modulus. In this paper, the approximate formulas derived have been got by single mode ultrasonic longitudinal and transverse waves corresponding to the mechanical properties parameters. This article was prepared alumina ceramic materials with different porosity through a series of processes and using the ultrasonic method of dynamic method for testing the mechanical properties of the porous medium. The velocities of ultrasonic longitudinal and transverse wave in aluminum oxide ceramics were measured by UVM-2 sound analyzer. The elastic modulus and shear modulus of alumina ceramic were deduced by the velocities data. Then analyzing the mechanical properties of the elastic modulus and shear modulus of alumina ceramic and also studying the effect of porosity on mechanical properties. In addition, this article also used the same method to test the mechanical properties of Q235 steel and aluminum test block. Finally, the modulus calculated by standard formula and approximate formula were analyzed. The results show that with regard to the metal materials, the testing method by approximate formula can greatly simplify the procedure of measurement.
Keywords: porous media; porosity; ultrasonic velocity; elastic modulus; shear modulus
目录
第一章绪论1
1.1研究背景及意义1
1.2现有力学性能测试方法2
1.3超声法测试力学性能优势2
1.5本文主要研究内容5
第二章物理基础.6
2.1超声波理论基础6
2.1.1超声波分类.6
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