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相关概念视频

Fatigue01:21

Fatigue

211
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...
211
Yield Criteria for Ductile Materials under Plane Stress01:25

Yield Criteria for Ductile Materials under Plane Stress

189
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...
189

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Updated: Jul 23, 2025

In Situ Time-dependent Dielectric Breakdown in the Transmission Electron Microscope: A Possibility to Understand the Failure Mechanism in Microelectronic Devices
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接口微结构对分层Cu/Ta微结构的动态故障行为的影响.

Rajesh Kumar1,2, Jie Chen1, Avanish Mishra1,3

  • 1Department of Materials Science and Engineering, Institute of Materials Science, University of Connecticut, 97 North Eagleville Road, Unit 3136, Storrs, CT, 06269-3136, USA.

Scientific reports
|July 13, 2023
PubMed
概括
此摘要是机器生成的。

这项研究揭示了接口结构和预变形如何影响FCC/BCC金属材料的机械强度和损伤行为. 了解这些因素对于设计适应极端环境的坚固材料至关重要.

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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:

  • 具有不可混合接口的结构金属材料提供可调节的微结构,以提高机械性能.
  • 面中心立方体 (FCC) 和体中心立方体 (BCC) 阶段可塑性对于耐损坏应用至关重要,需要高强度和热稳定性.
  • 了解动态故障机制对于设计在极端条件下工作的材料至关重要.

研究的目的:

  • 描述各种接口微结构中的可塑性贡献者.
  • 为了研究FCC/BCC层层微结构中的损伤演变行为.
  • 阐明预变形和接口能量对动态故障的影响.

主要方法:

  • 利用分子动力学 (MD) 模拟来分析六个模型的铜/ (Cu/Ta) 接口系统.
  • 检查了既有创建和预变形的接口微结构,具有不同的定向关系.
  • 在不同的负载条件下 (垂直和平行于接口) 研究了塑性贡献和空隙核化/演变.

主要成果:

  • 预先存在的不合适位移和负载方向显著影响滑动系统的激活.
  • 观察到动态强度和接口能量之间的相关性:低能耗接口的强度更高,高能耗接口的强度更低.
  • 预变形改变动力强度,并修改强度和接口能量之间的关系.

结论:

  • 接口结构,包括位移和方向,极大地影响塑性变形和故障机制.
  • 接口能量是确定动力强度的关键因素,但其相关性可以通过预变形来调节.
  • 这项研究为设计先进的金属材料提供了基本的见解,为苛刻的应用提供了量身定制的机械反应.