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関連する概念動画

Plasticizers01:31

Plasticizers

352
Water-reducers, or plasticizers, are chemical admixtures used in concrete to improve strength and workability. These additives reduce the water-cement ratio without compromising workability, lower the cement content while maintaining the same workability, or increase workability to assist concrete placement in inaccessible areas.
Plasticizers function by using surface-active agents to create repulsive electrostatic forces between cement particles. This dispersion enhances the concrete's...
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Plasticity00:58

Plasticity

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Plasticity is the property where an object loses its elasticity and undergoes irreversible deformation, even after the deformation forces are eliminated. If a material deforms irreversibly without increasing stress or load, then this is called ideal plasticity. For example, when a force is applied to an aluminum rod, it changes its shape, but it does not return to its original shape once the force is removed. Plastic deformation or ductility is thus a permanent deformation or change in the...
3.0K
Plastic Behavior01:21

Plastic Behavior

531
A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and...
531
Plastic Deformations01:14

Plastic Deformations

412
It is essential to understand how structural members behave under plastic deformation when the bending stress exceeds the material's yield strength. This state of deformation permanently alters the shape of the member, in contrast to the linear elastic behavior observed before yielding. The strain at any point in the member is expressed in terms of maximum strain. Notably, the neutral axis, which coincides with the centroid during elastic bending, shifts away from the centroid under plastic...
412
Plastic Deformations01:19

Plastic Deformations

439
Plastic deformation represents a fundamental concept in materials science, which explains the irreversible change in the shape of a material when it experiences stress beyond its elastic capability. This phenomenon is important in structural engineering, especially in designing and analyzing cantilever beams—structures that are securely fixed at one end and bear loads at the opposite end. When these beams are subjected to loads within their elastic range, they will return to their...
439
Plastic Deformation in Circular Shafts01:20

Plastic Deformation in Circular Shafts

448
When materials are subjected to forces that surpass their yield strength, they undergo a process known as plastic deformation. This results in a permanent alteration or strain in their structure. This concept can be specifically applied to circular shafts, where the deformation leads to a change in its shape. The precise evaluation of this plastic deformation requires understanding the stress distribution within the circular shaft, which is achieved by calculating the maximum shearing stress in...
448

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Updated: Jan 22, 2026

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ピラミッドの変位によって媒介されるマグネシウムの大きな可塑性

Bo-Yu Liu1, Fei Liu1, Nan Yang1

  • 1Center for Advancing Materials Performance from the Nanoscale (CAMP-Nano) and Hysitron Applied Research Center in China (HARCC), State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China.

Science (New York, N.Y.)
|July 6, 2019
PubMed
まとめ

マグネシウム合金はエネルギー効率を高めるために強化することができます. サブミクロメーターマグネシウムの試料は,ピラミッドの平面により多くの変位を活性化することによって,柔らかさと強さを改善します.

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Theoretical Calculation and Experimental Verification for Dislocation Reduction in Germanium Epitaxial Layers with Semicylindrical Voids on Silicon
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Theoretical Calculation and Experimental Verification for Dislocation Reduction in Germanium Epitaxial Layers with Semicylindrical Voids on Silicon

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Last Updated: Jan 22, 2026

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科学分野:

  • 材料科学
  • 金属工学
  • 機械工学

背景:

  • 軽量なマグネシウム合金は 輸送のエネルギー効率に不可欠です
  • マグネシウムの限られた伸縮性は,しばしば非基礎変位に起因し,広範な適用を妨げています.
  • マグネシウムの可塑性を高めることが 潜在力を発揮する鍵です

研究 の 目的:

  • マグネシウムのプラスチックのストレスを収納する非基礎 (NP) 変位の役割を調査する.
  • 微小量のマグネシウムの プラスチック性を調べるため
  • 結晶の大きさ,変位活動,および機械的性質の関係を理解する.

主な方法:

  • インサイト伝送電子顕微鏡 (TEM) の機械試験
  • ピラミッド型の平面での脱位滑行の観察と分析
  • サブミクロメーターとバルクマグネシウムサンプル間の機械的性質の比較

主要な成果:

  • 非基礎的変位は,ピラミッドの平面に滑り込むことで,重要なプラスチックストレスを収納することができます.
  • サブミクロメーターのマグネシウムの試料は,散発品と比較してかなり高い可塑性を示しています.
  • より小さな結晶の大きさは,より高いストレスにつながり,より高い可塑性と強度のために,より多くの非基礎的変位を活性化します.

結論:

  • この研究は,マグネシウム合金の柔らかさを高めるメカニズムを示しています.
  • サブミクロンマグネシウムは高強度と高柔らかさのアプリケーションに希望を示しています.
  • マグネシウムのメカニカル性能を向上させるには 結晶のサイズを制御することが有効です