中文摘要：

由于RTM／纺织复合材料在物理性能上呈现显著的各向异性，给材料的缺陷检测和评价带来困难，提出了一种用于RTM／纺织复合材料孔隙率的非线性超声检测方法、从非线性理论出发，运用非线性超声的二次谐波非线性系数进行RTM／纺织复合材料孔隙率检测。分析结果表明，二次谐波非线性系数的改变与试块的孔隙率之间存在着良好的线性关系，有助于建立RTM／纺织复合材料孔隙率的超声检测模型。

英文摘要：

Because RTM/textile composites is anisotropic in the physical performance, it is difficult to make defects detection and evaluation. A kind of nonlin- ear ultrasonic detection approach for evaluating the void content of the RTM/textile composites is put forward, non- linear ultrasonic is proposed to test void content in RTM/ textile composites. It is shown that a linear relationship holds between the second harmonic nonlinear coefficient and void content, which will aid the nodel development for void content detection in the RTM/textile composites.