钢纤维水泥基材料吸波性能实验与隐身效能分析

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钢纤维长度、钢纤维掺量、复掺铁氧体、表面处理、温度和湿度等因素对钢纤维砂浆吸波性能的影响;同时根据所推导的隐身效能评价公式计算了钢纤维砂浆的隐身能力.研究表明:掺入钢纤维可以提高砂浆的低、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;温、湿度升高,钢纤维砂浆的吸波性能下降;复掺的铁氧体分布在试件表层时,钢纤维砂浆的吸波性能下降,而分布在整个试件内时,可提高低频段的吸波性能;表面开浅槽可以在较宽的频段内提高吸波性能,表面开深槽可使低频吸波效果明显提高;吸波效果较好的钢纤维砂浆在2.6～4GHz的频段内,其雷达最大探测距离可降低到素砂浆的84%～89%.

Absorption property experiment and stealthy effectiveness analysis of steel fiber cement based materials

Taking the power reflectivity measured by far field radar cross-section method as the characterization indicator to appraise absorbing property, absorbing property of pure mortar and influence of length and volume fraction of steel fiber, mixed addition of carbon fiber and ferrite, surface treatment, temperature and humidity on absorbing property of steel fiber mortar are discussed. Stealthy capability is calculated by a deduced evaluating equation of stealthy effectiveness. The results show that absorbing property of mortar in low and high frequency range can be increased by adding steel fiber and suitable length and volume fraction of steel fiber are pacing factors of improving absorbing property of mortar. Absorbing property of steel fiber mortar decreases with the increase of temperature and humidity, but it increases in a wider frequency range under making shallow grooves and markedly increases in the low frequency range under making deep grooves. Radar maximum detection range of steel fiber mortar with optimum absorbing effect reduces to 84%-89% compared with pure mortar in the frequency range of 2.6-4GHz.