聚合物基复合材料中孔隙率及层间剪切性能的实验表征

在不同固化压力条件下制作孔隙含量不同的层合板.将层合板进行超声C扫描以识别孔隙率分布不同的区域,然后再将孔隙率分布相对均匀的区域进行超声波二次穿透反射法检测以精确测量孔隙的含量,并取试样测量孔隙的体积含量和测试层间剪切性能(ILSS).结果表明,在孔隙率低于4%时,孔隙率与层间剪切性能基本成线性关系,并且孔隙率每增加1%,层间剪切性能约下降8%.从而建立起层合板中孔隙率与层间剪切性能的定量表征关系.

Experimental Characterization of Porosity and Interlaminar Shear Strength in Polymeric Matrix Composites

A quantitative relationship between void content and interlaminar shear strength(ILSS) has been determined for a polymeric matrix composite material.Differences in void content were achieved using different pressures during the autoclave curing cycle following standard processes.Areas of different porosity were identified after an ultrasonic double-through-transmission technique.Specimens were then selected and prepared for void content measurement and for three-point flexure test.The testing results were correlated to void volume fraction and ultrasonic absorption coefficient.The study indicates that,in the range from zero to 4 %,each 1 % increase in porosity will cause an approximate 8% in ILSS for this polymeric matrix composite material.