Prediction of Ablation Properties of Polyimide Based Thermal Protective Composites under LEO and sub-LEO Environment

초록

This paper predicted the ablation properties of materials with the reactive molecular dynamics under LEO and sub-LEO environment, the extreme environment. AO and N2 which are the atmospheric particles under LEO and sub-LEO environment were considered, and evaluated the ablation behavior of kapton and kapton-CNT composite under 3 kinds of particle bombardment (AO, AO+N2, N2) considering the 200 km attitude. The AO and N2 had different ablation mechanism, and N2 also affected on the ablation of materials as much as AO. Additionally, AO and N2 independently maintained their own ablation mechanism under mixed environment. Also, this paper predicted that adding the CNT to kapton can decreased the heating ratio and damage of materials by particles collision, and checked the validity of the ablation properties prediction method under LEO and sub-LEO environment through comparison with the experiment results from NASA.

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