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ダイナミック・ジャミング・フロントによる密度の高いサスペンションの衝撃活性化による固化
Scott R Waitukaitis1, Heinrich M Jaeger
1James Franck Institute and Department of Physics, The University of Chicago, Chicago, Illinois 60637, USA. swaitukaitis@uchicago.edu
Nature
|July 13, 2012
まとめ
密度の高いサスペンションは,軽く動かすと液体のように作用するが,強い力下では固まる. この研究は,シア加厚ではなく,衝撃による固化を明らかにし,モメンタムを吸収する彼らの驚くべき能力を説明しています.
科学分野:
- 物理 物理学 物理学とは
- マテリアルサイエンス 材料科学
- 流体力学 流体力学とは
背景:
- 密度の高い粒子のサスペンションは,剪定加厚を示し,軽微な干渉で液体のように振る舞うが,強い力下では固まる.
- 既存のモデルは,スイア加厚を水力動力学的相互作用または粒子の膨張に起因するものだが,これらは衝撃下での極端な正常なストレス発生を完全に説明できない.
研究 の 目的:
- 密度の高い粒子サスペンションの異常な衝撃抵抗の背後にある物理的メカニズムを調査する.
- 剪定加厚は,これらの非ニュートン流体の衝撃行動だけを説明するという支配的な見解に異議を唱えるために.
主な方法:
- 衝撃のダイナミクスを捉えるために高速ビデオ撮影,組み込みの力センサー,X線画像を使用した.
- コーンフローア・イン・ウォーターのサスペンションに金属棒がぶつかった時の減速を研究した.
- ダイナミック固化とその影響がサスペンションの動作に及ぼす量的なモデルを開発した.
主要な成果:
- 衝撃が固化フロントを生じ,粒子マトリクスを詰まった領域に変換することを実証した.
- このダイナミックな固化が例外的なモメンタム吸収につながり,シアまたは拡張で見られる限界をはるかに超えていることが観察されました.
- 観測された衝撃の振る舞いを新しいモデルで定量的に再現した.
結論:
- 密度の高いサスペンションの顕著な耐震性は,主にシール加厚ではなく,衝撃によって発生するダイナミック固化によるものです.
- この現象は,急速に成長する詰まった領域を作り出し,大きなモメンタム分散を可能にします.
- 密度の高い粒子サスペンションにおける衝撃抵抗の理解を修正し,固化メカニズムを明確に強調する.
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