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Members Made of Elastoplastic Material01:19

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The behavior of elastoplastic materials under bending stresses, particularly in structural members with rectangular cross-sections, is crucial for predicting material responses and understanding failure modes. Initially, when a bending moment is applied, the stress distribution across the section follows Hooke's Law and is linear and elastic. This distribution means the stress increases from the neutral axis to the maximum at the outer fibers, up to the elastic limit.
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The fluid mosaic model was first proposed as a visual representation of research observations. The model comprises the composition and dynamics of membranes and serves as a foundation for future membrane-related studies. The model depicts the structure of the plasma membrane with a variety of components, which include phospholipids, proteins, and carbohydrates. These integral molecules are loosely bound, defining the cell’s border and providing fluidity for optimal function.
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A pressure-composition phase diagram explicitly describes the behavior of an ideal solution of two volatile liquids under varying pressures and compositions. A pressure-composition diagram has two main curves. The bubble point curve represents the plot of pressure versus liquid mole fraction. It indicates the pressure at which the first bubble of vapor forms from the liquid phase as the system pressure decreases.The dew point curve is the pressure versus vapor mole fraction. It indicates the...
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The study of solid circular shafts under stress shows that within the elastic limit, stress increases directly to the distance from the shaft's center. This relationship holds until the shaft reaches a critical point of stress, beyond which it begins to yield, marking the transition from elastic to plastic deformation. At this crucial juncture, the maximum torque the shaft can endure without permanent deformation is determined, signifying the limit of its elastic behavior.
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Updated: Apr 16, 2026

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駆動材料. 駆動材料. 駆動する材料. ヴォクセル化された液晶弾性体.

Taylor H Ware1, Michael E McConney2, Jeong Jae Wie1

  • 1Air Force Research Laboratory, Materials and Manufacturing Directorate, Wright-Patterson Air Force Base, OH, USA. Azimuth Corporation, Dayton, OH, USA.

Science (New York, N.Y.)
|February 28, 2015
PubMed
まとめ
この要約は機械生成です。

研究者らは,局所的に制御された分子順序を持つプログラム可能な液晶弾性体を開発した. これにより,柔らかい材料は需要に応じて形を変えることができ,新しい多機能デバイスを可能にします.

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科学分野:

  • マテリアルサイエンス 材料科学
  • ソフトロボティクス ソフトロボティクス
  • ポリマー化学のポリマー化学について

背景:

  • ソフトな材料のプログラム可能な形状の変化は,高度なデバイスの機能に不可欠です.
  • 機械反応の大きさと方向性に対する局所的な制御は,重要な課題です.
  • 液晶弾性体 (LCE) は,調節可能な機械的性質の可能性を秘めています.

研究 の 目的:

  • 精密に制御された局所的な機械的反応を持つ柔らかい,オーダーされた材料を開発する.
  • パターンされた分子順序を用いて平板から3Dオブジェクトの製造を実証する.
  • 多機能デバイスを作成するためのこれらの材料の潜在能力を探求する.

主な方法:

  • 空間的にパターン化されたディレクター (分子順序) による液晶弾性体製剤.
  • 局所的なボリューム要素 (voxels) の内部で 0.0005 mm3.5 の大きさでディレクターを書き込む.
  • 形状の変化 (曲げたり,伸ばしたり) を誘導するために,熱的または化学的刺激を利用する.

主要な成果:

  • ディレクターに対する局所的な制御を達成し,素材の機械的反応を決定する (最大55%の張力).
  • 平らなLCEシートを制御された曲げと伸縮で3Dオブジェクトに変換することを実証しました.
  • 精密な形状プログラミングのために,小さなヴォクセルで成功裏にパターン化されたディレクター.

結論:

  • 局所的なディレクター制御を備えたプログラム可能な形状変化のLCEは実現可能である.
  • これらの材料は,制御された変形を介して,モノリシック,多機能デバイスの作成を可能にします.
  • 潜在的な用途には,航空宇宙,医療,消費財の柔軟な電子機器のための再構成可能な基板が含まれます.