深空探测采样用PBO纤维基取芯软袋在火星全环境模拟下的效应及性能研究

作为人类开发第二家园的所在地，我们对火星的探索从未停止，随着天问一号的成功发射，我国也即将开启火星采样工程。“采样返回”任务是深空探测的核心技术之一，取芯软袋作为地外天体探测采样任务中唯一直接与土壤相接触的组件，其性能的优劣可能直接决定整个探测任务的成败。本项目基于嫦娥五号月壤采集任务的成功完成，分析取芯软袋在火星星表特殊且恶劣的环境下工作可能面临的严苛环境，选取高性能PBO纤维为编织原料，考察PBO纤维在火星全环境模拟条件下的性能，包括应力及辐照场耦合作用下PBO纤维辐射损伤行为及自由基演化机理，并建立PBO纤维应力-辐照场耦合作用损伤理论，火星表面砂尘及风速环境对纤维（取芯软袋）力学性能的影响及损伤机理剖析，相关实验结果有望为深空探索采样奠定一定的基础。

As the location of the second home for human development, our exploration of Mars has never stopped. With the successful launch of astronomy-1, China is about to start the Mars sampling project. The "sampling return" mission is one of the core technologies of deep-space exploration. As the only component that directly contacts with the soil in the sampling mission, the performance of the coring flexible bag will directly determine the success or failure of the whole mission. Based on the successful completion of chang'e-5 lunar soil collection mission, this project analyzes the severe environment that the coring flexible bag may face when working in the special and harsh environment of Mars catalogue. High performance PBO fiber is selected as the braiding material to investigate the properties of PBO fiber under the Mars environment simulation conditions, including the radiation damage behavior and free radical evolution mechanism of PBO fiber under the coupling effect of stress and radiation field In addition, the damage theory of PBO fiber coupled with stress radiation field is established, and the influence of sand dust and wind speed on the mechanical properties of PBO fiber (soft core bag) and the damage mechanism are analyzed. The relevant experimental results are expected to lay a foundation for deep space exploration and sampling in the future.