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相关概念视频

Design Example: Aggregate Gradation01:24

Design Example: Aggregate Gradation

91
The right type and quality of aggregates are crucial for concrete as they significantly influence its properties, mix proportions, and cost-effectiveness. If different sources are available for sand, the commonly used fine aggregate in concrete, the selection of sand is primarily based on its gradation.
The grading, or particle-size distribution, of sand is determined using sieve analysis, with standard sizes ranging from 150 μm to 10 mm (ASTM No. 100 sieve to 3⁄8 in. sieve). Sand is...
91
Bending of Members Made of Several Materials01:08

Bending of Members Made of Several Materials

147
In analyzing a structural member composed of two different materials with identical cross-sectional areas, it is crucial to understand how their distinct elastic properties affect the member's response under load. The analysis involves assessing stress and strain distributions using the transformed section concept, which accounts for variations in material properties.
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each...
147
Stress-Strain Diagram - Ductile Materials01:24

Stress-Strain Diagram - Ductile Materials

699
The stress-strain relationship in ductile materials such as structural steel or aluminium is intricate and progresses through several stages. When a specimen is loaded, it initially exhibits a linear length increase, depicted by a steep straight line on the stress-strain diagram. It indicates the material is elastically deforming and will return to its original shape once unloaded. However, when a critical stress value is reached, plastic deformation begins. This stage sees substantial...
699
Stress Concentrations01:24

Stress Concentrations

281
Stress concentration is when stress intensifies near discontinuities such as holes or abrupt cross-sectional changes in a structural member. This localized stress can often surpass the average stress within the member. The stress distribution in flat bars, either with a circular hole or varying widths connected by fillets, can be determined experimentally using a photoelastic method. The results are based on ratios of geometric parameters like the ratio of the hole's radius to the smaller...
281
Saint-Venant's Principle01:18

Saint-Venant's Principle

586
The principle of Saint-Venant postulates that the stress distribution within a structural member does not rely on the precise method of load application except in the vicinity of the load application points. Consider a scenario where loads are centrally applied on two plates. In this case, the plates move toward each other without any rotation. This movement causes the member to contract in length and expand in width and thickness. Uniform deformation across all elements and maintaining...
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相关实验视频

Updated: Jun 22, 2025

Additive Manufacturing of Functionally Graded Ceramic Materials by Stereolithography
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关于SS 316L/Inconel 625功能等级材料中的组成过渡梯度优化策略的研究.

Qiang Zhu1, Xiaoyan Yu2, Ping Yao3

  • 1School of Robotics, Guangdong Open University, Guangzhou 510091, China.

Materials (Basel, Switzerland)
|June 27, 2024
PubMed
概括

在SS 316L/Inconel 625功能分级材料 (FGM) 双线弧增材制造中优化过渡梯度消除了缺陷. 该研究发现,50%的Inconel 625具有最佳的机械性能.

关键词:
组成过渡梯度梯度的组成.双线电弧增材制造 双线电弧增材制造具有功能分级的材料.机械性能 机械性能 机械性能微观结构的微观结构优化策略 优化策略

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科学领域:

  • 材料科学 材料科学 材料科学
  • 制造业 工程 制造工程
  • 金工业是金工业的一个方面.

背景情况:

  • 电线弧增材制造 (WAAM) 允许通过控制电线料速度来制造功能分级材料 (FGM).
  • 开发SS 316L/Inconel 625 FGM在管理过渡区和防止破裂等缺陷方面存在挑战.

研究的目的:

  • 通过使用双线电弧增材制造 (D-WAAM) 生产SS 316L/Inconel 625 FGM.
  • 优化过渡梯度以增强机械性能和减轻缺陷形成,特别是谷物边界裂.

主要方法:

  • 使用双线弧增材制造 (D-WAAM) 来制造SS 316L/Inconel 625 FGMs.
  • 实施了一种组成梯度优化策略,在过渡区中改变Inconel 625含量.
  • 分析了不同梯度组成的微硬度,拉伸性质和缺陷形成.

主要成果:

  • 确定了20%重量的Inconel 625过渡区,呈现出显著的谷物边界裂,降低微硬度和较差的拉伸性能.
  • 观察到消除裂和改善微硬度和拉伸性能,因为Inconel 625含量增加.
  • 确定过渡区中的50重量%的Inconel 625含量导致了最优的机械性能.

结论:

  • 构成梯度优化策略有效地消除了容易出现微缺陷和机械性能差的区域.
  • 通过优化过渡梯度,在SS 316L/Inconel 625 FGM中实现了优越的整体机械特性.
  • 证明了D-WAAM在生产具有定制性质的高性能FGM方面的有效性.