对于体积含量60%～70%的飞灰空心球/Al多孔材料(CAPM),其等效弹性模量理论预测值通常会比实验值高出大约50%.为此,本文用有限元方法对其等效模量进行了数值模拟,并且在考虑了CAPM中孔洞和基体之问的相互作用之后,对数值模拟值进行了理论修正.得到的结果与实验值吻合的相当好.
For face-centered cubic (FCC) stacking of fly ash (FA) cenosphere/Al porous materials (CAPM) at a volume fraction of 60%-70%,theoretical predicting generally overestimates the effective elastic modulus about 50% more than the experimental measurement.To address this issue,finite element method (FEM) is employed first to evaluate the effective elastic modulus,followed by a theoretical modification to account interactions between CAPM interstitials and matrix.Results obtained give a better match between the theoretical predictions and the experimental data.
参考文献
| [1] | Sanders WS.;Gibson LJ. .Mechanics of BCC and FCC hollow-sphere foams[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2003(1/2):150-161. |
| [2] | P.R. Marur .Effective elastic moduli of syntactic foams[J].Materials Letters,2005(14/15):1954-1957. |
| [3] | Thomas Fiedler;Eusebio Solorzano;Andreas Oechsner .Numerical and experimental analysis of the thermal conductivity of metallic hollow sphere structures[J].Materials Letters,2008(8/9):1204-1207. |
| [4] | Li SG;Wongsto A .Unit cells for micromechanical analyses of partiele-reinforeed composites[J].Mechanics of Materials,2004,36:543-572. |
| [5] | Gibson LJ;Ashby MF.Cellular Solids-Structure and Properties[M].Cambridge:Cambridge University Press,1997 |
| [6] | He MY;Wu B;Zok FW .On the mechanics of microballoonreinforced metal matrix composites[J].Mechanics of Materials,1995,20:315-320. |
| [7] | Huang JS;Gibson LJ .Elastic moduli of a composite of hollow spheres in a matrix[J].Journal of the Mechanics and Physics of Solids,1993,41(01):55-75. |
| [8] | Lu ZX;Gao ZT .Determination of effective mnduti of composite of hollow spheres in a matrix[J].Journal of university of aeronautics and astronautics,1997,8:461-466. |
| [9] | 窦作勇 .空心球/Al多孔材料阻尼与冲击吸能行为及其机理研究[D].哈尔滨工业大学,2008. |
| [10] | Lian J;Jiang Z;Liu J .Theoretical model for the tensile work hardening behavior of dual phase steel[J].Materials Science and Engineering,1991,147:55-62. |
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