@inproceedings{oai:jaxa.repo.nii.ac.jp:00005227,
 author = {島村, 宏之 and Shimamura, Hiroyuki},
 book = {宇宙航空研究開発機構特別資料, JAXA Special Publication: Proceedings of International Symposium on "SM/MPAC & SEED Experiment"},
 month = {Mar},
 note = {International Symposium on "SM/MPAC & SEED Experiment" (International Congress Center EPOCHAL TSUKUBA, 10-11 March 2008), Mechanical properties of polyimide films after exposure to a low earth orbit (LEO) environment were investigated using tensile tests. Polyimide films were placed in a tensile stress state during space exposure to evaluate the effects of tensile stress state on degradation of mechanical properties. Atomic oxygen (AO), ultraviolet (UV), and electron beam (EB) irradiation tests were also conducted for polyimide films to enable comparison to the degradation behavior of the flight samples. Results show that the tensile strength and elongation were decreased by space exposure. The reduction of the mechanical properties became marked as the exposure period increased. The AO irradiation was considered to be the main degrading factor; both UV and EB had only slight effects on the mechanical properties. The tensile strength and elongation of the AO irradiated samples decreased with increased AO fluence. Moreover, the surface roughness of the AO irradiated samples developed dependently on the increased AO fluence. Consequently, surface roughness is one of the leading causes of degradation of mechanical properties. Excessive stress might concentrate at a concave region on the rough surface, leading to formation of surface cracks and initiation points of destruction. No obvious difference attributable to the tensile stress state (below 7 MPa) was apparent in the degradation of mechanical properties., 資料番号: AA0064307011, レポート番号: JAXA-SP-08-015E},
 pages = {81--90},
 publisher = {宇宙航空研究開発機構, Japan Aerospace Exploration Agency (JAXA)},
 title = {Effects of LEO environment on mechanical properties of polyimide films under tensile stress},
 volume = {JAXA-SP-08-015E},
 year = {2009}
}