関連する実験動画
Updated: Aug 1, 2026
06:56
Micro/Nano-scale Strain Distribution Measurement from Sampling Moiré Fringes
Published on: May 23, 2017
ポリクリスタルの変形時に発生する粒子の回転のインサイト測定
L Margulies1, G Winther, H F Poulsen
1Materials Research Department, Risø National Laboratory, 4000 Roskilde, Denmark.
Science (New York, N.Y.)
|March 27, 2001
まとめ
焦点を当てた硬いX線を用いた新しい方法は,多結晶材料の粒と亜粒のダイナミクスを明らかにします. アルミニウムの変形に関する実験結果は,テイラーとサックスのような古典的な質感モデルに挑戦しています.
科学分野:
- マテリアルサイエンス 材料科学
- クリスタルグラフィーです.
- 物理 物理学 物理学とは
背景:
- 質感の進化は,多結晶材料の特性に大きな影響を与えます.
- 既存のマクロスコープのテクスチャーモデルには,異なる理論的アプローチを区別する解像度が欠けている.
- 穀物および亜穀物レベルのダイナミクスを理解することは,正確な材料行動予測に不可欠です.
研究 の 目的:
- 穀物および亜穀物レベルでの構造動態の探査のための普遍的な方法を導入する.
- 材料変形中の質感の進化に関する実験データを提供する.
- 実験的観測に対する古典的なテクスチャーモデルの妥当性をテストする.
主な方法:
- 高解像度の構造分析のために,焦点を当てた硬いX線を用いた difraktion を利用しました.
- 純アルミニウム試料の張力変形を調査した.
- 微細構造レベルでの量化された実験的粒子の回転.
主要な成果:
- 開発された方法は,穀物と亜穀物の構造的動態に関するデータを成功裏に提供しました.
- 張力負荷下で純粋アルミニウムで観察された実験的な粒子の回転が記録されました.
- これらの実験的発見は,古典的なテイラーとサックスの質感モデルからの予測と矛盾しています.
結論:
- 焦点の硬いX線 difraktion 方法は,微細構造のダイナミクスを研究するための普遍的なアプローチを提供します.
- 古典的なテクスチャーモデルは,変形中の粒子の回転の複雑さを完全に捉えることができないかもしれません.
- 実験的観測と一致する新しいモデルを改良または開発するためにさらなる研究が必要です.
関連する概念動画
02:18X-ray Crystallography
The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
01:20Plastic Deformation in Circular Shafts
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...
01:12Transformation of Plane Strain
When analyzing elongated structures like bars subjected to uniformly distributed loads, it is essential to understand the transformation of plane strain when coordinate axes are rotated. This transformation helps to assess how material deformation characteristics vary with orientation, which is crucial in materials science and structural engineering.
Under plane strain conditions, typical for members where one dimension significantly exceeds the others, deformations and resultant strains are...
Under plane strain conditions, typical for members where one dimension significantly exceeds the others, deformations and resultant strains are...
01:29Three-Dimensional Analysis of Strain
Three-dimensional strain analysis is crucial for understanding how materials deform under stress, particularly in elastic, homogeneous materials. This method employs principal stress axes to simplify complex stress states into more understandable forms. Subjected to stress, a small cubic element within a material either expands or contracts along these axes, transforming into a rectangular parallelepiped. This transformation effectively illustrates the material's deformation. The principal...
01:27Measurements of Strain
Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain gauge...
01:29Determination of Crystal Structures
In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...