光干渉法による進展する疲労き裂近傍のひずみ分布の測定

• 金 永植

  東京工業大学

• 加藤 昇

  東京工業大学

• 田村 博

  東京工業大学

書誌事項

タイトル別名

• Measurements of Strain Distribution near the Propagating Fatigue Crack by Optical Interference Method

抄録

The plastic zone and the plastic strain behaviours near the propagating fatigue crack for SM41 and HT80 steels were observed continuously on various specimen thicknesses, using optical interference method. The relationship between the shape or size of the plastic zone and stress intensity factor range (ΔK) was clarified. In addition, the effects of plastic zone size, and the slope of plastic strain distribution on crack propagating rate were investigated on each test steel.<BR>Main results obtained are as follows.<BR>1) The necking zone appears periodically ahead of a propagating carck in SM41 steel of which the lower yielding point is clear. The size of necking zone increases with a growth of crack. However, this periodic necking zone is not shown in HT80 steel.<BR>2) The relationship between the length of plastic zone (Rx) and the ratio of ΔK/σY, appeared as follows;<BR>Rx=C₁ (ΔK/σY)² for SM41 steel<BR>Rx=C₂ (ΔK/σY)^1.5 for HT 80 steel<BR>Here, C₁ is affected by specimen thickness, while C₂ is almost constant in both specimen thicknesses.<BR>3) The slope of plastic strain distribution ahead of a crack is unvariable during the propagating of the crack.

収録刊行物

• 溶接学会誌

  溶接学会誌 48 (9), 731-736, 1979

  一般社団法人 溶接学会

キーワード

• Metals and Alloys
• Surfaces, Coatings and Films
• Mechanical Engineering
• Mechanics of Materials

詳細情報

• CRID: 1390001206499268352
• NII論文ID: 130003763514
• DOI: 10.2207/qjjws1943.48.731
• ISSN: 18837204
• ISSN: 00214787
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可