Dynamic Porosity of 3D Network SiC Ceramic as the Shock-damping And Acoustic-absorbing Material for Ultra-precise Machine Laying

Dan Huang; Ying Wang; Wu Zhao
January 2016
Key Engineering Materials;2016, Vol. 667, p267
Academic Journal
The continuously improving of the performance of ultra-precise machine bed is claimed for, including not only the better tolerance stiffness, strength, shock and wear resistance, but also the further shock-damping and acoustic-absorbing performance. In this paper, the acoustic absorption for continuous network SiC ceramic as the laying of ultra-precise machine bed is investigated. By way of the constitutive relation of the network SiC ceramic, the flexibility matrix of such structural body is obtained. In line with the virtual loading application, the balance equation of the unit cell of the network structure is constructed, as well as the effective stress and effective Yang's modulus. While the elastic flexibility matrix of the structure body can be re-construct with the results above, the bulk strain of the material under the infinitesimal strain would be derived from the modified matrix. The mechanism induced the deformation of network SiC structure is revealed by means of the combination of the dynamic porosity model with the bulk strain. The sensitivities of all kinds of effective factors to the dynamic porosity is analyzed and the order of parameters' sensitivities to the dynamic porosity of 3D triangle structure is: pressure < temperature < initial porosity < network rod length < network rod radius. The results lay the theoretical foundation of the micro-mesh structure design of the network ceramics as the ultra-precise machine beding.


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