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相关概念视频

Fatigue01:21

Fatigue

239
Fatigue occurs when materials rupture under repeated or fluctuating loads, even at stress levels far below their static breaking strength. It typically results in brittle failure, even for ductile materials. It is a critical consideration in designing machines and structural components subjected to repetitive or varying loads. The nature of these loadings can range from fluctuating loads like unbalanced pump impellers causing vibrations to repeatedly bending a thin steel rod wire back and forth...
239
Fatigue Strength of Concrete01:22

Fatigue Strength of Concrete

286
Fatigue, in the context of materials science and engineering, refers to the weakening or failure of a material caused by repeatedly applied loads, even if these loads are below the strength limit of the material. Fatigue strength in concrete is a critical property that influences its durability and longevity. Concrete can fail in two ways due to fatigue. Static fatigue or creep rupture occurs under a constant load or one that increases slowly. The other failure mode is due to cyclical or...
286
Yield Criteria for Ductile Materials under Plane Stress01:25

Yield Criteria for Ductile Materials under Plane Stress

216
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...
216
Design Consideration01:22

Design Consideration

323
Designing a structure involves a series of considerations, primarily the material's ultimate strength, calculated through tests that measure changes under increased force until the material reaches its breaking point or limit. The ultimate load, where the material breaks, is divided by its original cross-sectional area, resulting in the ultimate normal stress or strength. The ultimate shearing stress is another significant factor taken into account.
The factor of safety is another key...
323
Plastic Deformations01:14

Plastic Deformations

131
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...
131
Principal Stresses in a Beam01:11

Principal Stresses in a Beam

422
In prismatic beams subject to arbitrary transverse loading, It is essential to analyze the interaction between shear forces and bending moments in order to understand stress distribution and ensure structural integrity. The highest normal or bending stress occurs at the outer fibers of the beam, decreasing linearly to zero at the neutral axis. In contrast, shear stress peaks at the neutral axis and diminishes toward the outer surfaces.
Analyzing principal stresses is crucial, especially in...
422

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Comparison of Various Intrinsic Defect Criteria to Plot Kitagawa-Takahashi Diagrams in Additively Manufactured AlSi10Mg.

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相关实验视频

Updated: Sep 13, 2025

Full-field Strain Measurements for Microstructurally Small Fatigue Crack Propagation Using Digital Image Correlation Method
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在增材制造中通过最大后期优化实现基于原子的疲劳性质规范化.

Mustafa Awd1,2, Lobna Saeed3, Frank Walther4

  • 1Institute for Informatics and Automation (IIA), Bremen City University of Applied Sciences (HSB), Flughafenallee 10, 28199 Bremen, Germany.

Materials (Basel, Switzerland)
|July 30, 2025
PubMed
概括

这项研究引入了一个新的框架来预测3D打印金属的疲劳强度,如AlSi10Mg和Ti-6Al-4V. 它通过考虑材料微观结构和缺陷来准确预测疲劳性能,这对于增材制造至关重要. 关键词:疲劳强度,3D打印金属,增材制造,微观结构.

关键词:
贝叶斯优化是贝叶斯的优化.添加剂制造 添加剂制造 添加剂制造原子主义建模的模型.疲劳的预测和疲劳的预测微观结构的异质性

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科学领域:

  • 材料科学 材料科学 材料科学
  • 机械工程 机械工程
  • 计算材料科学科学 计算材料科学

背景情况:

  • 像激光粉床融合 (L-PBF) 这样的增材制造 (AM) 工艺引入了独特的微观结构特征和缺陷 (多孔性,残余应力).
  • 预测AM合金中的疲劳强度是具有挑战性的,因为它具有复杂的工艺结构和性能关系.
  • 现有的模型往往难以捕捉AM材料固有的异质性.

研究的目的:

  • 开发一个多尺度,微观结构意识的框架,用于预测AM合金中的疲劳强度分布.
  • 量化AM特有的微结构特征对疲劳性能的影响.
  • 为AM金属的疲劳设计提供一个数据高效和物理可解释的途径.

主要方法:

  • 密度函数理论 (DFT) 的整合,用于统一的能量计算.
  • 在模量测量中使用仪器缩入.
  • 应用贝叶斯推理和基于MAP的统计模型来预测疲劳.
  • 与实验高周期和非常高周期疲劳 (HCF/VHCF) 数据的验证.

主要成果:

  • 该框架准确地预测了L-PBF AlSi10Mg和Ti-6Al-4V的疲劳强度分布,并得到了验证的结果.
  • 预测的沃勒 (S-N) 曲线和巴黎裂生长参数涵盖了超过92%的实验数据.
  • 全球灵敏度分析确定孔隙性和残留应力是疲劳强度差异的主要贡献者 (>70%).

结论:

  • 开发的框架提供了一个强大的,准确的方法来预测增材制造金属的疲劳强度.
  • 它强调了工艺诱导的缺陷和微结构异质性在AM疲劳性能中的关键作用.
  • 该方法可扩展到其他AM合金和工艺变体,促进微观结构知情设计.