繰り返し載荷における塑性誘起損傷による強度と靭性の低下を考慮した結合力埋込型弾塑性構成則

• 新宅 勇一

  筑波大学システム情報系

• 副島 克哉

  筑波大学大学院システム情報工学研究科構造エネルギー工学専攻

• 堤 成一郎

  大阪大学接合科学研究所

• 寺田 賢二郎

  東北大学災害科学国際研究所

書誌事項

タイトル別名

• An Elastic-plastic Constitutive Law Embedding Cohesive Cracks with Plasticity-induced Damage to Realize Degradation of Strength and Toughness under Cyclic Loading
• クリカエシサイカ ニ オケル ソセイ ユウキ ソンショウ ニ ヨル キョウド ト ジンセイ ノ テイカ オ コウリョ シタ ケツゴウリョク ウメコミガタダン ソセイ コウセイソク

抄録

An elastic-plastic constitutive law embedding cohesive cracks with plasticity-induced damage is proposed to realize degradation of strength and toughness under cyclic loading. A conventional elastic-plastic constitutive law with isotropic and kinematic hardening is combined with our cohesive-force embedding damage model to realize plastic deformation and fracture behavior under monotonic and cyclic loading by solving two kinds of conditional equations. One of them is local balance equation between cohesive traction and principal stress and the other is yield function with nonlinear isotropic and kinematic hardening law. The relationship between the cohesive traction and the crack opening displacement is determined by a cohesive zone model associated with energy release rate to represent process of stress release due to formation of crack surface. In addition, a new plasticity-induced damage is introduced into the cohesive zone model to realize the degradation of the tensile strength and the energy release rate caused by the accumulated plastic strain. On the other hand, the difference of the plastic deformation under various ranges of cyclic loading is represented by additional hardening law depending on a memory surface that is corresponding to plastic strain range. After the material parameters are identified from three experimental results under monotonic and cyclic loading, the capability of our proposed constitutive law is demonstrated by prediction of residual tensile strength and breaking strain of a metal after cyclic loading.

収録刊行物

• 鉄と鋼

  鉄と鋼 106 (9), 662-671, 2020

  一般社団法人 日本鉄鋼協会

キーワード

• fatigue
• residual strength
• damage
• cohesive zone model
• fracture toughness
• strength
• material constitutive law
• kinematic hardening
• memory surface
• plastic model

詳細情報

• CRID: 1390003825209192832
• NII論文ID: 130007892964
• NII書誌ID: AN00151251
• DOI: 10.2355/tetsutohagane.tetsu-2019-121
• ISSN: 18832954
• ISSN: 00211575
• ISSN: http://id.crossref.org/issn/00211575
• NDL書誌ID: 030646678
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I030646678
• Web Site: https://www.jstage.jst.go.jp/article/tetsutohagane/106/9/106_TETSU-2019-121/_pdf
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• 抄録ライセンスフラグ: 使用不可