JP5505280B2 - 鋼構造物の使用限界予測手法 - Google Patents
鋼構造物の使用限界予測手法 Download PDFInfo
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- JP5505280B2 JP5505280B2 JP2010262124A JP2010262124A JP5505280B2 JP 5505280 B2 JP5505280 B2 JP 5505280B2 JP 2010262124 A JP2010262124 A JP 2010262124A JP 2010262124 A JP2010262124 A JP 2010262124A JP 5505280 B2 JP5505280 B2 JP 5505280B2
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- 229910000831 Steel Inorganic materials 0.000 title claims description 43
- 239000010959 steel Substances 0.000 title claims description 43
- 238000000034 method Methods 0.000 title claims description 17
- 238000006073 displacement reaction Methods 0.000 claims description 51
- 230000007547 defect Effects 0.000 claims description 34
- 238000012360 testing method Methods 0.000 claims description 18
- 238000011156 evaluation Methods 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 5
- 238000004458 analytical method Methods 0.000 description 15
- 239000013077 target material Substances 0.000 description 7
- 238000013461 design Methods 0.000 description 3
- 239000010953 base metal Substances 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000012512 characterization method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000009864 tensile test Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 230000007847 structural defect Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Description
1.鋼管の延性き裂進展挙動は延性き裂が欠陥最深部から発生した後、管厚方向に進展し最終的に板厚を貫通することでリークへと至るものである。
2.延性き裂が進展する部位では同時に管厚方向に局所くびれが生じて管厚が減少し、よりリークへと至りやすい状況になる。
3.特に、延性き裂進展長さ(Δa)および局所くびれ量(Ra)を用いて求まる有効延性破壊パラメータが1.0になると延性き裂進展長さおよび局所くびれ量が急激に大きくなり延性き裂が板厚を貫通しリークへと至る。
4.鋼管の延性き裂進展挙動は、小型試験片であるSingle edge notched tension試験片の延性き裂進展挙動として再現可能である。
5.3、4より有効延性破壊パラメータ1.0を指標にすることで小型試験の延性き裂進展抵抗と構造物の変形挙動計算を用いて内圧のかかる構造物の使用限界(リーク発生点)を予測できる。
1.鋼構造物の延性破壊による使用限界を予測する鋼構造物の使用限界予測手法であって、 鋼構造物における欠陥の有効開口変位が予め定めた限界有効開口変位量に達する時の外力または変形量を前記鋼構造物の使用限界外力または変形量とし、
前記限界有効開口変位量は鋼構造物に存在する表面欠陥から生じた延性き裂が板厚を貫通する際の有効開口変位量であって、
評価対象物と同じ材質で前記欠陥と同じ板厚に対する欠陥深さ寸法の切欠きを有する小型試験片を用いた試験から前記切欠きの有効開口変位と延性き裂進展長さと局所くびれ量を測定することで求めた延性破壊抵抗曲線において、有効延性破壊パラメータが1.0に達するときの有効開口変位であることを特徴とする鋼構造物の使用限界予測手法。
(1)内圧のかかる構造物がリークへ至るまでに許容できる外力(変形量)を、実構造物を用いた試験をせずとも簡易に予測できるので、当該構造物の使用条件を容易に判別できる。(2)また、構造物に作用する外力(変形量)が決定している場合、当該構造物に許容できる欠陥寸法も簡易に予測できるので、欠陥の補修可否の検討等メンテナンスにも活用でき鋼構造物の長寿命化、維持コストの削減にも役立つ。
Claims (1)
- 鋼構造物の延性破壊による使用限界を予測する鋼構造物の使用限界予測手法であって、 鋼構造物における欠陥の有効開口変位が予め定めた限界有効開口変位量に達する時の外力または変形量を前記鋼構造物の使用限界外力または変形量とし、
前記限界有効開口変位量は鋼構造物に存在する表面欠陥から生じた延性き裂が板厚を貫通する際の有効開口変位量であって、評価対象物と同じ材質で前記欠陥と同じ板厚に対する欠陥深さ寸法の切欠きを有する小型試験片を用いた試験から前記切欠きの有効開口変位と延性き裂進展長さと局所くびれ量を測定することで求めた延性破壊抵抗曲線において、有効延性破壊パラメータが1.0に達するときの有効開口変位であることを特徴とする鋼構造物の使用限界予測手法。
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JP2012247271A (ja) * | 2011-05-26 | 2012-12-13 | Jfe Steel Corp | 鋼構造物の使用限界予測方法 |
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CN104842085B (zh) * | 2015-04-24 | 2017-01-25 | 中国航空工业集团公司北京航空材料研究院 | 一种高温合金薄壁管材表面气孔缺陷的模拟及实验方法 |
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JPS585629A (ja) * | 1981-07-02 | 1983-01-13 | Nippon Kokan Kk <Nkk> | 延性破壊抵抗測定方法 |
WO2005108636A1 (ja) * | 2004-05-11 | 2005-11-17 | Sumitomo Metal Industries, Ltd. | 超高強度uoe鋼管とその製造方法 |
US7039528B2 (en) * | 2004-07-29 | 2006-05-02 | General Electric Company | Method for detecting leak before rupture in a pipeline |
JP4886623B2 (ja) * | 2007-07-09 | 2012-02-29 | 株式会社東芝 | 破壊評価方法 |
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