In this study, Ketjenblack/silicone-rubber composites with gradually changing pore sizes are produced to develop strain sensor materials whose electrical resistivities change with an increase in strain. The pore sizes and distributions are evaluated by X-ray computed tomography and compared to uniform porous composites containing the same ingredients. Results showed that the resistivities of the graded porous composites decreased more significantly than those of the uniform porous composites at high compression rates of greater than 20%. Analytical results of strain distribution based on the digital image correlation method indicated that the resistivity changes at high compression rates were caused by a gradual increase in size of the area with low resistivity. The changes in resistivity demonstrated that graded porous composites are promising strain sensor materials that can be used under high compression rates.

在这项研究中，Ketjenblack/硅橡胶复合材料的孔径逐渐变化，以开发应变传感器材料，其电阻率随应变的增加而变化。孔径和分布通过 X 射线计算机断层扫描进行评估，并与含有相同成分的均匀多孔复合材料进行比较。结果表明，在大于 20% 的高压缩率下，梯度多孔复合材料的电阻率比均匀多孔复合材料的电阻率下降得更显着。基于数字图像相关法的应变分布分析结果表明，高压缩率下的电阻率变化是由低电阻率区域的尺寸逐渐增加引起的。