赤外線応力測定によるCFRP積層板の応力測定と非破壊評価手段としての適用に関する検討

• Material Type: 規格・テクニカルリポート類
• Title: 赤外線応力測定によるCFRP積層板の応力測定と非破壊評価手段としての適用に関する検討
• Author/Editor: 杉本, 直; 石川, 隆司; Sugimoto, Sunao; Ishikawa, Takashi
• Author Heading: 杉本, 直; 石川, 隆司; Sugimoto, Sunao; Ishikawa, Takashi
• Publication, Distribution, etc.: 航空宇宙技術研究所
• Publication Date: 1999-12
• Publication Date (W3CDTF): 1999-12
• Alternative Title: Examination of quantitative infrared stress measurement of CFRP laminates and its application to non-destructive evaluation
• Periodical title: 航空宇宙技術研究所報告
• No. or year of volume/issue: 1396
• Volume: 1396
• Pages: 1-23
• ISSN (Periodical Title): ISSN : 0389-4010
• Text Language Code: jpn
• Subject Heading: 赤外線応力測定; 非破壊評価; 多方向積層CFRP積層板; 多方向積層炭素遷移強化プラスチック積層板; 熱弾性係数; エポキシ樹脂; 熱膨張係数; 層間剥離; 非定常熱伝導; 衝撃損傷; 有孔積層板; infrared stress measurement; nondestructive evaluation; multi ply CFRP laminate; muti ply carbon fiber reinforced plastic laminate; thermoelastic constant; epoxy resin; thermal expansion coefficient; interlayer peeling; unsteady heat conduction; impact damage; perforated laminate
• Target Audience: 一般
• Note (General): The infrared stress measurement technique was applied to the qualitative measurement of stress in Carbon Fiber Reinforced Plastic (CFRP) composites; the main advantages of this measurement method being its in-situ and non-contact nature. As a first step, thermoelastic constants were obtained for unidirectional CFRP (UD-CFRP) using the infrared stress measurement system. The resulting values were compared with thermoelastic constants derived using basic equations. As a consequence, the reliability of the measured thermoelastic constants was established and the effectiveness of this measurement system for quantitative stress measurement was confirmed. The temperature dependency of the transverse coefficient of thermal expansion and specific heat at constant stress in UD-CFRP were also demonstrated to have a tendency to cancel one another out so as to decrease the temperature dependency of the thermoelastic constant. Such a finding was considered to be an advantage of the infrared stress measurement technique for CFRP. In addition, other influential factors on measurement were examined. Regarding the infrared stress measurement for multi-ply CFRP laminates, one important issue is to evaluate the effect of heat conduction from internal plies where heat is produced as a result of the thermoelastic effect. Although the heat flux from internal plies as a result of the thermoelastic effect and applied loading has the same frequency, the infrared stress measurement system allows the surface temperature amplitude to be synchronized with the loading. The heat conduction effect for multi-ply CFRP laminates was evaluated numerically based on an analytical equation and FEA (Finite Element Analysis). These calculated values were compared with those obtained from infrared stress measurement. A high degree of coincidence between theoretical, FEA, and experimental results was obtained. It was clearly shown that thermal conduction must be considered in the infrared stress measurement of multi-ply CFRP should the surface layer be a ply with a low thermoelastic constant. Finally, some examples of applications of this technique to the non-destructive evaluation of CFRP laminates have also been presented.; 資料番号: AA0001987000; レポート番号: NAL TR-1396
• Access Restrictions: インターネット公開
• Data Provider (Database): 国立情報学研究所 : 学術機関リポジトリデータベース（IRDB）（機関リポジトリ）; https://irdb.nii.ac.jp
• Original Data Provider (Database): 宇宙航空研究開発機構 : 宇宙航空研究開発機構リポジトリ

• Summary, etc.: 赤外線応力測定は、非接触で、かつ、その場での観察が可能な非破壊評価手法の一つとして、CFRP(炭素繊維強化プラスチック)に適用されてきている。この応力測定を定量化する場合に必要となる1方向CFRP材の熱弾性係数すなわち応力変化と温度変化の係数を、赤外線応力画像システムを用いて測定すると共に、支配方程...