Measurement of Super-Pressure Balloon Deformation with Simplified Digital Image Correlation

Applied Sciences

Shuichi Arikawa¹  Kazuki Koseki²  Takuma Matsuo³ 

[1] Department of Mechanical Engineering Informatics, School of Science and Technology, Meiji University, Kawasaki City, Kanagawa Prefecture 214-8571, Japan;Department of Mechanical Engineering, Graduate School of Science and Technology, Meiji University, Kawasaki City, Kanagawa Prefecture 214-8571, Japan;Department of Mechanical Engineering, School of Science and Technology, Meiji University, Kawasaki City, Kanagawa Prefecture 214-8571, Japan;

关键词: super pressure balloon;    stress concentration;    strain;    non-contact measurement;    digital image correlation;    large deformation;   

DOI  :  10.3390/app8102009

来源: DOAJ

【 摘 要 】

A super pressure balloon (SPB) is an aerostatic balloon that can fly at a constant altitude for an extended period. Japan Aerospace Exploration Agency (JAXA) has been developing a light-weight, high strength balloon made of thin polyethylene films and diamond-shaped net with high tensile fibers. Previous investigations proved that strength requirements on SPB members are satisfied even though the net covering the SPB sometimes becomes damaged during the inflation test. This may be due to non-uniform expansion, which causes stress concentration, however, no method exists to confirm this hypothesis. In this study, we tested a new method called Simplified Digital Image Correlation method (SiDIC) to check if it can measure the displacement of the SPB by using a rubber balloon. After measuring the measurement accuracy of the Digital Image Correlation method (DIC) and SiDIC, we applied both DIC and SiDIC to a rubber balloon covered just with the net. Interestingly, SiDIC entailed a smaller amount of data but could measure the deformation more accurately than DIC. In addition, assuming the stress concentration, one part of the net was bonded to the balloon to restrict the deformation. SiDIC properly identified the undeformed region.

【 授权许可】

Unknown