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在0.1~0.35MPa的树脂注射压力条件下,制备了孔隙含量不同的玻璃纤维连续毡/E51环氧树脂的RTM工艺试件,采用超声法、金相法和密度烧失法测量试件的孔隙含量。讨论了孔隙含量随树脂注射压力变化关系以及孔隙含量对RTM复合材料超声参数和力学性能的影响规律。结果表明,树脂注射压力的变化对孔隙含量产生明显影响,注射压力由0.1MPa增加到0.35MPa,玻璃纤维连续毡/E51环氧树脂复合材料的孔隙含量从9.95%减小至3.73%。超声特征参数有随孔隙含量的增加呈近于线性递增的关系,尤其是超声非线性特征参数的变化更加明显;超声特征参数的变化可评价复合材料孔隙含量。
The RTM process specimens of glass fiber continuous felt / E51 epoxy resin with different pore contents were prepared under the pressure of 0.1 ~ 0.35MPa under the condition of resin injection pressure. The pore contents of the samples were measured by ultrasonic method, metallographic method and density loss method. The relationship between pore volume and resin injection pressure and the effect of pore volume on the ultrasonic parameters and mechanical properties of RTM composites were discussed. The results show that the change of resin injection pressure has a significant effect on the void content. The injection pressure increases from 0.1MPa to 0.35MPa. The void content of glass fiber continuous felt / E51 epoxy composite decreases from 9.95% to 3.73%. The characteristic parameters of ultrasound have a nearly linear relationship with the increase of pore volume, especially the change of nonlinear characteristic parameters of ultrasound is more obvious. The change of ultrasonic characteristic parameters can evaluate the pore volume of composites.