含细观孔隙Al/Al2O3梯度功能材料弹性模量研究
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1.武汉理工大学新材料力学理论与应用湖北省重点实验室,武汉 430070;2.武汉理工大学材料复合新技术国家重点实验室,武汉 430070

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国家自然科学基金重点项目(51932006)


Elastic Modulus of Al/Al2O3 Functionally Gradient Materials Containing Mesoscopic Pores
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1.Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics,Wuhan University of Technology,Wuhan 430070;2.State Key Lab of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070

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    摘要:

    利用渐近均匀化方法对含细观孔隙Al/Al2O3梯度功能材料(FGM)的弹性模量进行了研究。通过与实验对比,验证了渐近均匀化方法预测含细观孔隙Al/Al2O3梯度功能材料弹性模量的可行性,并在忽略孔隙个数等次要因素的情况下,拟合得到了与孔隙率和Al2O3体积分数相关的含细观孔隙Al/Al2O3梯度功能材料弹性模量的预测公式。研究结果表明:细观孔隙在Al/Al2O3梯度功能材料的弹性模量预测中并不能被忽略。在相同孔隙率下,孔隙的个数对Al/Al2O3梯度功能材料的弹性模量影响较小,而孔隙的大小和位置对弹性模量有着明显的影响,在Al2O3的任何体积分数下,Al/Al2O3梯度功能材料的弹性模量含随机孔隙的均低于均匀分布孔隙的。孔隙率也对Al/Al2O3梯度功能材料的弹性模量有着明显的影响,随着孔隙率的增加,材料的弹性模量逐渐下降,且随Al2O3体积分数的增加下降幅度增大。

    Abstract:

    The elastic modulus of Al/Al2O3 FGM with mesoscopic pore was studied by using the method of asymptotic homogenization.The feasibility of the asymptotic homogenization method to predict the elastic modulus of Al/Al2O3 FGM with mesoscopic pores was verified by comparison with the experiment.In the case of ignoring the number of pores and other minor factors,the prediction formula of the elastic modulus of Al/Al2O3 FGM with mesoscopic pores was obtained by fitting,which is related to porosity and Al2O3 volume fraction.The results show that the mesoscopic pores can not be ignored in the prediction of the elastic modulus of Al/Al2O3 FGM. Under the same porosity,the number of pores has little influence on the elastic modulus of Al/Al2O3 FGM,while the size and location of pores have great influence on the elastic modulus.The elastic modulus of Al/Al2O3 FGM with random pores is lower than that of Al/Al2O3 FGM with uniform pores under various volume fractions.Porosity also has an obvious influence on the elastic modulus of Al/Al2O3 FGM.With the increase of porosity,the elastic modulus of materials gradually decreases,and the greater the volume fraction of Al2O3,the greater the decrease.

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何济沧,刘齐文,沈强,刘立胜.含细观孔隙Al/Al2O3梯度功能材料弹性模量研究[J].宇航材料工艺,2020,50(3):17-22.

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  • 收稿日期:2019-10-21
  • 最后修改日期:2019-12-24
  • 录用日期:2020-01-02
  • 在线发布日期: 2020-06-17