摘要
对空心玻璃微珠填充环氧树脂复合泡沫材料进行了准静态压缩实验,研究了材料的宏观压缩力学性能,并提出了弹性模量和屈服强度的预测公式。此外,对压缩试件的断口进行了宏、细观观察,研究了材料的压缩破坏机理。结果表明,复合泡沫材料在压缩过程中,具有普通泡沫材料的应力-应变曲线的典型特征,在应变为2%左右时材料发生屈服,在应变大于30%后发生破坏。此外,材料的杨氏模量和强度均随密度的减小而下降,预测公式给出的结果与实验值基本一致。压缩试件断口的宏、细观观察表明,复合泡沫材料主要的破坏形式为剪切引起的弹塑性破坏。
The compressive mechanical properties of epoxy syntactic foam reinforced with hollow glass microspheres are studied by quasi-static compression tests. Some predicting formulae of Young~ s modulus and yield strength of syntactic foam are proposed based on the results of composite mechanics. In addition, the failure mechanism of syntactic foam is investigated by macroscopic and microscopic observation of fractured specimens. The results show that the deformation characteristics of syntactic foams are very similar to those of plain foams during compression. The syntactic foam is yielded when the strain reaches about 2% and it is collapsed when the strain is larger than 30%. Furthermore, the Young＇s modulus and yield strength of syntactic foam are decreased with the decrease of density of material, and the predicted results of formulae are basically in agreement with the experimental data. The macroscopic and microscopic observation of fractured specimens indicates that the main failure mode is elasto-plastic collapse caused by shear.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2005年第4期17-22,共6页
Acta Materiae Compositae Sinica
基金
国防科技重点实验室基金(51460020103hk01)
NSAF联合基金(10276004)
关键词
复合泡沫材料
力学性能
压缩
失效机理
环氧树脂
syntactic foam
mechanical properties
compression
failure mechanism
epoxy resin
