1. カーボン/ポリイミド開発基礎試験:チップフィン部分構造試作試験
- Author
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Naito, Hirokazu, 内藤 浩和, Naito, Hirokazu, and 内藤 浩和
- Abstract
This report described results of a trial manufacture and strength tests of full scale model of the tipfin subsystem structure of HOPE-X (H-2 Orbiting Plane-Experimental), which is one of parts where Carbon/Polyimide (C/Pi) materials are used. The tipfin subsystem structure is a front part of the rudder, which is among the parts attached to the main wing tip of HOPE-X, and is inter spar structural parts excluding the leading edge and TPS (Thermal Protection System). The inter spar structures of the tipfin was designed based on the preset design load of the tipfin and the design basis of C/Pi. During manufacture of the test object, technical problems in fabrication were investigated, and data on molding and assembling were acquired, resulting in the construction of the full scale model of the tipfin subsystem structure including integral molding of skin/stringer. Strength tests both at normal and high temperature (260 C) were carried out. Displacements of the manufactured tipfin in the ultimate load test was generally in good agreement with those of FEM (Finite Element Method) analysis, though the test results were slightly larger. Otherwise, no difference was observed in the test results at normal and high temperatures. The test object was confirmed to withstand the design load, indicating that there was no problem in the strength. The results of distortion data in the tests agreed with those of FEM analysis. It was also confirmed that there was no problem in the method of the analysis. In the high temperature (260 C) tests, the test object was heated in an environmental vessel. The temperature distribution on the object was uniform, which confirmed the validity of the high temperature test. Destructive tests were carried out twice. It was confirmed that regions, where C/Pi materials were used, were not damaged at 200 percent LMT (Limit) load. Most parts of this test object were designed with respect to evaluation of buckling. However, no buckling took place in the s, 本報告では、HOPE-X(宇宙往還技術試験機)において、カーボン/ポリイミド(C/Pi)材の適用を計画している部位の1つである、チップフィン実大部分構造の試作および強度試験の結果を示した。ここで述べるチップフィン部分構造は、HOPE-Xの主翼先端に取り付けられる部分のうち、ラダーの前方部分であり、前縁およびTPS(熱防護システム)を除いた桁間構造部である。すでに設定されているチップフィン設計荷重およびC/Pi設計基準に基づきチップフィン桁間構造設計を行った。供試体の製作を実施する中で、工作上の技術課題を検討し、成形、組立などに関するデータを取得し、スキン/ストリンガ一体成形を含むC/Piチップフィンの実大部分構造試作を行った。常温、高温(260度C)での強度試験を実施した。終局荷重試験の変位の結果は、FEM(有限要素法)解析と比べ若干大きいが、概ね一致していると言える。また、常温と高温の試験結果にほとんど差がない。試験供試体は設計荷重に対し耐荷し、強度上問題の無いことが確認できた。また、試験時の供試体各部の歪みなどのデータに関してもFEM解析などの結果と一致し、解析手法にも問題のないことが確認できた。高温(260度C)試験は、環境槽で加熱を行ったが、試験時の供試体温度はほぼ均一であり、高温試験の有効性も確認できた。破壊試験を2回実施した。C/Pi材の部位については、200%LMT(制限荷重)において、破壊せず健全であることが確認できた。本供試体の大部分が座屈評定の設計であるが、強度試験において座屈は生じなかった。C/Pi材の実機適用の目途がついた。
- Published
- 2015