低应变率下硅铝质泡沫陶瓷复合材料的力学性能研究

Research of Mechanical Properties of Sialic Foamed Ceramic Composite at Low Strain Rate

以泡沫陶瓷复合材料在防护工程中的应用为背景，利用MTS（Material Test System，材料试验机）对该型材料进行了准静态压缩实验。得到了应变率在10^-5～10^-3s^-1范围内的应力应变曲线，并对实验结果进行了理论分析和数值模拟。研究表明，泡沫陶瓷复合材料的力学性能在准静态一维应力压缩条件下显示出明显的应变率效应，同时其应力应变曲线可用一种经验的脆性材料本构模型进行较好地拟合。而在一维应变压缩条件下，材料的应力应变曲线则显示出明显的三段式特征：弹性段、平台段和密实段，同时材料的吸能幅值随着应变率的增大而增加。

Taking the application of foamed ceramic composite in protection engineering as background, Material Test System（MTS）was used to investigate the mechanical behavior of sintering foamed ceramic composite under quasi-static compression loading. Its stress-strain curves were obtained within the strain rate range from 10^-5 s^-1 to 10^-3 s^-1. Experimental results were discussed based on theoretical analysis and numerical simulation. Results indicate that the behavior of foamed ceramic composite exhibits obvious strain rate effect under quasi-static one-dimensional stress compression loading, meanwhile, an empirical constitutive model for brittle materials can well fit the stress-strain curves. Under one-dimensional strain compression, the stress-strain curves exhibit obvious three-stage features： elastic region, plateau region and densified region. The energy absorption amplitude increases with the increase of strain rate.