{"created":"2023-05-15T12:00:00.601513+00:00","id":6664,"links":{},"metadata":{"_buckets":{"deposit":"1cf3e2c7-7322-4f08-bccc-39e898126add"},"_deposit":{"created_by":3,"id":"6664","owners":[3],"pid":{"revision_id":0,"type":"depid","value":"6664"},"status":"published"},"_oai":{"id":"oai:kyutech.repo.nii.ac.jp:00006664","sets":["8:24"]},"author_link":["28185","4338","28188","3665"],"item_21_alternative_title_18":{"attribute_name":"その他のタイトル","attribute_value_mlt":[{"subitem_alternative_title":"New Notch Strength Evaluation Method for Ductile Cast 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シャルピー衝撃試験は，振り子式のハンマーにより試験片を破壊させる手法であるため，実際の使用環境に合わせて試験速度を任意に変えることが困難である．したがって，シャルピー衝撃試験は，往々にして実際とはかけ離れた高速側のひずみ速度条件下での評価となる場合がある．図1.1に，各産業分野で想定されているひずみ速度を静的から超高速までに分類して示す.併せて，静的から超高速までの各ひずみ速度にそれぞれ対応できる試験方法も示す.図1.1より，自動車分野や建設機械分野における衝撃部材のひずみ速度は，シャルピー衝撃試験と同程度であり，衝撃の領域に分類される.一方で，多くの構造部材，特に橋梁分野や船舶分野などにおける溶接構造部材が受ける最も厳しいひずみ速度は，動的の領域であり，より遅いひずみ速度の引張試験やより速いひずみ速度のシャルピー衝撃試験では対応していない. そこで，まずはシャルピー衝撃試験と同様の形式で試験速度を変化させた場合について考える．本稿では，シャルピー衝撃試験と同形状の冶具と試験片（Vノッチ試験片）を用いて，高Si球状黒鉛鋳鉄について，静的から動的の領域のひずみ速度範囲において様々な試験速度で高速三点曲げ試験を行い，吸収エネルギ値とひずみ速度の関係を調べた結果について述べる．また，最大強度（切欠き三点曲げ強度）とひずみ速度の関係も調べ，吸収エネルギ値のひずみ速度依存性と比較検討する．さらに，各産業分野で用いられてきたフェライトーパーライト基地球状黒鉛鋳鉄における評価結果と比較検討することにより，高Si球状黒鉛鋳鉄の幅広い分野への適用の可能性について考察する．","subitem_description_type":"Abstract"}]},"item_21_description_5":{"attribute_name":"内容記述","attribute_value_mlt":[{"subitem_description":"この論文は乱丁のため、機械の研究 第70巻 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