Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : October 07, 2017 - October 09, 2017
Super-pressure balloons have been developed for scientific observation at high altitude as alternative of artificial satellite. By using this balloon, the cost problem can be solved. Super-pressure balloons have structure with thin film covered by net, so balloon can withstand high pressure. Net of rope for balloon is made of Polyarylate. This is one of high performance fiber, but the material is not evaluated in detail under high altitude environment. The purpose of this study is to evaluate the deterioration characteristics of degradation property. Rope for the super-pressure balloon is formed by two strands which is consists of thin fibers. In this study, tensile test about exposure rope were carried out and the specimens were observed after tests. As a result, the strength of rope was 2.7 times the required load when duration was 89 days although strength of rope decreased with increasing duration. The surface of rope changed dark yellow and fracture part was scattered. It is estimated that structure on outer rope surface was changed. Differences in shape were observed in the fracture area, which was presumed to be due to UV exposure. Moreover, surface of fibers that exposed outdoor have unevenness due to degradation. It is assumed that fracture occurred from unevenness that caused by outdoor exposure.
