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相关概念视频

Temperature Dependent Deformation01:12

Temperature Dependent Deformation

143
In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
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Recrystallization: Solid–Solution Equilibria01:10

Recrystallization: Solid–Solution Equilibria

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Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
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Thermal Strain01:19

Thermal Strain

779
Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
779
Residual Stresses01:26

Residual Stresses

207
Residual stresses reside in a structure even after removing the original stress inducer. This phenomenon often arises from varied plastic deformations across different parts of a structure. Consider a rod stretched beyond its yield point. It will not regain its original length due to permanent deformation. Even after load removal, the rod does not entirely lose stress because of uneven plastic deformations, resulting in residual stresses. The computation of these stresses in structures is...
207
Statically Indeterminate Problem Solving01:16

Statically Indeterminate Problem Solving

369
Statically indeterminate problems are those where statics alone can not determine the internal forces or reactions. Consider a structure comprising two cylindrical rods made of steel and brass. These rods are joined at point B and restrained by rigid supports at points A and C. Now, the reactions at points A and C and the deflection at point B are to be determined. This rod structure is classified as statically indeterminate as the structure has more supports than are necessary for maintaining...
369
Yield Criteria for Ductile Materials under Plane Stress01:25

Yield Criteria for Ductile Materials under Plane Stress

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In designing structural elements and machine parts using ductile materials, it is crucial to ensure that these components withstand applied stresses without yielding. Yielding is initially determined through a tensile test, which evaluates the material's response to uniaxial stress. However, tensile stress is insufficient when components face biaxial or plane stress conditions This condition requires advanced criteria to predict failure.
The Maximum Shearing Stress Criterion, also known as...
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相关实验视频

Updated: Jun 14, 2025

Experimental Methods for Investigation of Shape Memory Based Elastocaloric Cooling Processes and Model Validation
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一个基于内部状态变量的持续动态再结晶模型,用于热变形TC18合金.

Gui-Cheng Wu1,2, Yong-Cheng Lin1,2, Miao Wan1,2

  • 1School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China.

Materials (Basel, Switzerland)
|August 29, 2024
PubMed
概括

在热成型下研究了TC18合金中的连续动态再结晶 (CDRX). 一个内部状态变量模型准确地预测了流应力和微观结构的演变,显示了在更高的应变率下过渡到更细的基结构.

关键词:
这是一种TC18合金.连续的动态再结晶.内部状态变量是内部状态变量.微观结构的微观结构热力机械加工 热力机械加工

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Last Updated: Jun 14, 2025

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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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科学领域:

  • 材料科学 材料科学 材料科学
  • 金工业是金工业的一个方面.
  • 机械工程 机械工程

背景情况:

  • 连续动态再结晶 (CDRX) 在热成型过程中显著影响合金微结构.
  • 具有中等至高堆叠故障能量的TC18合金,在变形下表现出复杂的微观结构演变.

研究的目的:

  • 在热变形过程中调查TC18合金的流应力和CDRX行为.
  • 开发和验证基于内部状态变量 (ISV) 的CDRX模型.

主要方法:

  • 在TC18合金上的热变形实验.
  • 微结构分析侧重于谷物边界演变 (LAGBs到HAGBs).
  • 基于ISV的CDRX模型的开发,包括位移密度,温度和误导.

主要成果:

  • 变形引发了新的低角度粒度边界 (LAGBs),后转变为高角度粒度边界 (HAGBs).
  • 基于ISV的模型在预测真实应力方面显示出高精度 (R=0.989,RAAE=6.69%,RMSE=4.78 MPa).
  • 模型准确地预测了颗粒尺寸的减小,而延展率更高,温度更低,表明向持续再结晶的基结构的转变.

结论:

  • 开发的基于ISV的模型有效地捕捉了TC18合金中的CDRX现象.
  • 在特定的加工条件下,微结构从粗粒度过渡到更细的,持续再结晶的基结构.
  • 该模型提供了一种定量工具,用于预测热成型期间的微结构演变.