原子氧作用下聚酰亚胺薄膜剥蚀形貌仿真方法  

A method for simulating surface erosion morphology of polyimide film under atomic oxygen attack

作　　者：焦子龙 乔世英[1,2] 姜海富 姜利祥 刘宇明[1,2] 徐焱林 李涛[3] JIAO Zilong;QIAO Shiying;JIANG Haifu;JIANG Lixiang;LIU Yuming;XU Yanlin;LI Tao(Key Laboratory of Reliability and Environmental Engineering Technology;Beijing Institute of Spacecraft Environment Engineering,Beijing 100094,China;China Aerospace Science and Technology Corporation,Beijing 100048,China)

机构地区：[1]可靠性与环境工程技术重点实验室 [2]北京卫星环境工程研究所,北京100094 [3]中国航天科技集团有限公司,北京100048

出　　处：《航天器环境工程》2023年第4期367-373,共7页Spacecraft Environment Engineering

摘　　要：为研究低地球轨道(LEO)原子氧(AO)作用下航天器用聚酰亚胺(PI)薄膜材料剥蚀形貌变化规律,提出一种基于局部网格边界相交判断的剥蚀形貌仿真方法,并采用周期性边界处理法获得表面形貌。其计算所得材料掏蚀深度与文献中的试验结果相差小于4%,证明该方法对AO与PI材料的相互作用的仿真与试验结果相近。采用剥蚀深度算术平均偏差和标准差作为形貌的描述参数,发现这2个参数均随着AO累积通量以0.253次幂律增大。标准差和算术平均偏差的比值随AO累积通量的增大基本保持不变,说明表面形貌特征在AO作用下基本不变,只是表面峰值和谷值增大。此外,计算结果表明,不同轨道速度条件下PI表面剥蚀形貌差异不大。以上研究结果有助于进一步理解AO作用下PI材料表面剥蚀形貌形成机理。In order to study the erosion morphology of polyimide(PI) film materials under atomic oxygen(AO) attack in low Earth orbit(LEO),a method based on the intersection simulation of local grid boundaries was proposed.The periodic boundary method was applied to obtain the surface morphology.The difference between the calculation results of the erosion morphology and those of the experimental results in the literature was less than 4%,which proved that the interactions between AO and PI materials simulated by the proposed method was close to the experimental results.Using the arithmetic mean deviation and standard deviation of erosion depth as the morphology description,it was found that these two parameters all increased by power 0.253 with the increase of AO fluence.The ratio of standard deviation to arithmetic mean deviation remained basically unchanged with the increase of AO fluence,indicating that the surface morphology remained basically unchanged under the AO attack,when only the height of peaks and the depth of valleys increased.In addition,there was little difference in the surface erosion morphology of PI under different orbital velocities.The above results help to further understand the formation mechanism of PI surface erosion morphology under AO attack.

关 键 词：原子氧 剥蚀 表面形貌 聚酰亚胺 仿真分析 

分 类 号：V250.4[一般工业技术—材料科学与工程] TB115[航空宇航科学与技术—航空宇航制造工程]