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- 高橋 一比古
- （国研）海上・港湾・航空技術研究所 海上技術安全研究所
書誌事項
- タイトル別名
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- A Simple Repair Method of Fatigue Cracks Using Stop-holes Reinforced with Wedge Members
- A simple repair method of fatigue cracks using stop-holes reinforced with wedge members: applicability to reinitiated cracks and effects of an anti-fatigue smart paste
- – Applicability to Reinitiated Cracks and Effects of an Anti-fatigue Smart Paste –
- −再発き裂への適用性と耐疲労スマートペーストの効果−
説明
A simple method of repairing fatigue cracks using stop-holes reinforced with wedge members, that was previously proposed by the author, has been examined for the case of reinitiated cracks. By using this method, the stress intensity factor range around a reinitiated crack tip is expected to be reduced by the wedge load effect of the wedge members. The chief advantages of this method are that the repair work can be easily performed from only one side of a cracked structure, and that the wedge member can be set so adaptive as to maintain the wedge load automatically and effectively as the reinitiated crack grows. Specifically, slope-type wedge members have been adopted, and an adaptive mechanism of the wedge member has been devised using a pulley and a wire-type displacement meter. Fatigue tests were performed on a steel plate specimen with a drill hole and a notch, and validity of the above repair method was experimentally examined using both of simple and adaptive wedge members. In addition, an anti-fatigue smart paste, which consists of fine alumina particles and silicone grease, was applied to the periphery of the drill hole, and its effects on automatic restraint and visual detection of crack growth were investigated. FE analyses using contact elements were also carried out for a comparative study. As a result, it was found that the strain range on the specimen side is reduced to 44.0% and the fatigue life is prolonged by 12.4 times by application of the adaptive wedge member as compared with the case of the conventional stop-hole. As for the anti-fatigue smart paste, it was found that the fatigue life is further prolonged by about three times that in the case of the adaptive wedge member and the paste has an evident function to support visual detection of cracks.
収録刊行物
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- 溶接学会論文集
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溶接学会論文集 38 (4), 335-350, 2020
一般社団法人 溶接学会
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キーワード
詳細情報 詳細情報について
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- CRID
- 1390849376468546816
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- NII論文ID
- 130007937713
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- ISSN
- 24348252
- 17542138
- 02884771
- 09507116
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- 本文言語コード
- ja
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- 資料種別
- journal article
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- データソース種別
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- JaLC
- Crossref
- CiNii Articles
- KAKEN
- OpenAIRE
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- 抄録ライセンスフラグ
- 使用不可
