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Thin-walled members with non-symmetrical cross-sections are vital to engineering structures, offering material efficiency and structural integrity. However, unsymmetrical loading on these members leads to complex stress distributions, resulting in simultaneous bending and twisting can cause deformation or structural failure. The interaction between bending and twisting requires detailed analysis to ensure structural resilience.
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The design of prismatic beams, structural elements with a uniform cross-section, focuses on ensuring safety and structural integrity under load. The design process begins by determining the allowable stress, either from material properties tables, or by dividing the material's ultimate strength by a safety factor. This safety factor is essential for accommodating uncertainties, and varies depending on the material—timber, steel, or concrete—with each having unique strength and...
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The shear center of a channel section with uniform thickness, height, and width, is determined by computing the shear force in the member and calculating the moments of inertia of the sections.
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軽量な形状記憶マグネシウム合金

Yukiko Ogawa1, Daisuke Ando2, Yuji Sutou2

  • 1Department of Materials Science, Graduate School of Engineering, Tohoku University, 6-6-11, Aoba-yama, Aoba-ku, Sendai 980-8579, Japan.

Science (New York, N.Y.)
|July 28, 2016
PubMed
まとめ

研究者は,超弾性および形状回復性を示す軽量マグネシウム (Mg) 形状記憶合金 (SMA) を開発しました. この新しいMg SMAは,既存のチタンニッケル (TiNi) SMAと比較して,新しい産業用途の道を開く.

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科学分野:

  • 材料科学
  • 金属工学
  • 固体物理学

背景:

  • 形状記憶合金 (SMA) は加熱時に形状回復と超弾性を示す.
  • 既存のSMAは通常,TiNi,銅,鉄,ニッケル,コバルトなどの多結晶合金に基づいています.
  • マグネシウム (Mg) やアルミニウム合金などの軽量合金は,これらの形状記憶特性を示していません.

研究 の 目的:

  • 形状記憶に関する軽量合金の可能性を調査する.
  • マグネシウムベースの新しい形状記憶合金 (SMA) を開発する.

主な方法:

  • スカンジウムを含むマグネシウム合金の開発.
  • 合金の超弾性および形状回復特性の特徴.
  • 根底にあるメカニズムを分析し,可逆的なマルテンシート変換を特定する.

主要な成果:

  • 新しいMg SMAが開発され,軽量なスカンジウムが組み込まれました.
  • Mg SMAは - 150°Cで4. 4%の超弾性を示し,加熱時に形状回復を示した.
  • 合金の密度は約2g/cm3で,従来のTiNi SMAよりも約3分の1低い.

結論:

  • この研究は,最初のMg SMAで,超弾性と形状回復が実証されました.
  • 形状記憶の性質は,可逆的なマルテンシート変換に起因する.
  • この突破は,様々な産業で軽量SMAの開発と適用の可能性を広げています.