Elastic constant matrix measurement of SiCp reinforced aluminum metal matrix composites
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摘要: 为研究粉末冶金制备的碳化硅颗粒增强铝基复合材料(SiCp/Al)中SiCp含量对材料机械性能的影响,使用弹性波法测量了SiCp含量不同的标准试样的弹性常数矩阵.利用Christoffel方程建立了横观各向同性材料波速与弹性常数之间的关系,介绍了水浸斜入射法测量准横波和准纵波波速的基本原理和测量过程,基于上述原理进行了试验,计算出了被测试件的弹性常数.结果表明,SiCp/Al沿挤压方向的机械性能最高,并且随着SiCp含量的增加,弹性常数变大,材料的强度升高.Abstract: In order to reveal the relationship between SiCp volume content and mechanical property of SiCp reinforced aluminum metal-matrix composites (MMC) fabricated by powder metallurgy, the elastic constant matrix of the standard samples with different SiCp volume content were measured with elastic wave method. The relationship between the velocities of ultrasonic waves travelled in the material and the elastic constant matrix was deduced with Christoffel equation in transverse isotropy model. The basic principle of velocity measurement of quasi-longitudinal waves and quasi-transverse waves with the oblique incidence immersion method was introduced. The experiments based on the above mentioned principle and method were carried out and the elastic constant matrixes of the standard samples were calculated out. The results show that the mechanical property of material in the extrusion direction is better than the other directions, and with the increasing of SiCp content, the elastic constant rises and the intensity of the material enhances.
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Key words:
- ultrasonic testing /
- powder metallurgy aluminum /
- elastic waves
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