Study on Fracture Prediction for Advanced High Strength Steels (Second Report)

超ハイテン材の破断に対する予測技術の研究(第2 報)

The stress triaxiality dependent fracture criterion for strength estimation using simple uniaxial tensile test specimens with a center hole and edge notches, has been successfully identified in the previous reports. In this study, to measure the fracture strain of three classes of advanced high strength steels under the shear stress state, two new shear test specimens named by bear-face specimen and slit specimen, respectively, and their testing methods were developed. Totally, three types of shear testing including a conventional butterfly shear test were performed. Three finite-element models corresponding three types of shearing specimens were developed and fracture strain was identified. It was repeatedly observed in experiments that the cracks initiated at the edge of all shear specimens where the stress triaxiality is near the plane strain rather than pure shear stress state according to the CAE results computed by FEM.簡単な1軸引張り試験機を用いて2種類のせん断試験片と試験方法を提案した．また，比較のため，すでに利用されている複雑形状を持つButterflyせん断試験片およびせん断試験も実施した．さらに試験観測とCAE解析で3種類のせん断試験による破断起点の局所応力ひずみや破断現象を詳細に検討し，応力三軸度が小さい領域における破断塑性ひずみを同定した．実験結果と計算結果によると，破断起点は，純せん断応力状態の位置でなく応力3軸度が高い位置であることが分かった．

• Record URL:
  https://doi.org/10.11351/jsaeronbun.47.603
• Record URL:
  http://scholar.google.com/scholar_lookup?title=Study%20on%20Fracture%20Prediction%20for%20Advanced%20High%20Strength%20Steels%20(Second%20Report)&author=N.%20Ma&author=K.%20Takada&author=K.%20Nagasaka&author=K.%20Sato&author=R.%20Nishimura&author=T.%20Tokunaga&author=R.%20Nishimura&author=R.%20Takeda&author=T.%20Iwai&author=R.%20Nishi&author=K.%20Kojima&author=N.%20Nii&author=M.%20Sakamoto&author=K.%20Ikeda&author=Y.%20Nishiura&author=S.%20Shano&author=K.%20Saito&author=M.%20Omiya&publication_year=2016
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/02878321
• Authors:
  • Ma, Ninshu
  • Takada, Kenji
  • Nagasaka, Kei
  • Sato, Kentaro
  • Nishimura, Ryuichi
  • Tokunaga, Takayuki
  • Nishimura, Ritsu
  • Takeda, Riki
  • Iwai, Takahiro
  • Nishi, Ryu
  • Kojima, Kousuke
  • Nii, Naoki
  • Sakamoto, Masafumi
  • Ikeda, Koutaro
  • Nishiura, Yuko
  • Shano, Shinichiro
  • Saito, Kei
  • Omiya, Masaki
• Publication Date: 2016

Language

• English
• Japanese

Media Info

• Media Type: Web
• Features: Figures; References; Tables;
• Pagination: pp 603-608
• Serial:
  • Transactions of Society of Automotive Engineers of Japan
  • Volume: 47
  • Issue Number: 2
  • Publisher: Society of Automotive Engineers of Japan
  • ISSN: 0287-8321
  • EISSN: 1883-0811
  • Serial URL: https://www.jstage.jst.go.jp/browse/jsaeronbun
• Publication flags:

  Open Access (libre)

Subject/Index Terms

• TRT Terms: Computer aided design; Evaluation; Fracture mechanics; High strength steel; Materials; Mathematical prediction; Shear tests; Testing
• Subject Areas: Materials; Transportation (General);

Filing Info

• Accession Number: 01661704
• Record Type: Publication
• Source Agency: Japan Science and Technology Agency (JST)
• Files: TRIS, JSTAGE
• Created Date: Feb 28 2018 5:04PM