碳纤维水泥基材料吸波性能与隐身效能分析

ABSORPTION PROPERTY AND STEALTHY EFFECTIVENESS OF CARBON FIBER CEMENT BASED MATERIALS

采用远场雷达散射截面法测试的功率反射率为表征吸波性能的指标,研究了素砂浆的吸波性能以及碳纤维长度、碳纤维掺量、搅拌方法、复掺铁氧体、温度和湿度等因素对碳纤维砂浆吸波性能的影响,根据所推导的隐身效能评价公式计算了碳纤维砂浆的隐身能力。研究表明:掺入碳纤维只能提高砂浆的高频吸波性能;合适的纤维长度和体积掺量是提高砂浆吸波性能的决定性因素;机器搅拌方法制备的碳纤维砂浆的吸波性能好于人工搅拌方法制备的碳纤维砂浆;温度、湿度升高,或者复掺铁氧体、碳纤维砂浆的吸波性能均下降;最佳配比的碳纤维砂浆在14～18GHz的频段内,其雷达最大探测距离可降低到素砂浆的80%～90%。

Taking the power reflectivity measured by far field radar scattered cross-section method as the characterization indicator to appraise the absorption property, the absorption property of pure mortar and the influence of length and volume fraction of carbon fiber, mixing method, combined addition of carbon fiber and ferrite, temperature and humidity on the absorption property of carbon fiber mortar were investigated. The stealthy capability was calculated by a deduced evaluation equation of stealthy effectiveness. The results show that the absorption property of mortar in the high frequency range can be increased by adding carbon fiber, and a suitable length and volume fraction of carbon fiber are important factors for improving the absorption property of mortar. The absorption property of carbon fiber mortar made by the machine mixture is better than that by the artificial mixture, and it decreases with the increase of temperature and humidity or with the combined addition of carbon fiber and ferrite. The maximum radar detection range of carbon fiber mortar with an optimum mixture ratio is 80 %-90 % of pure mortar in the frequency range of 14-18 GHz.