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Related Concept Videos

Transmission Electron Microscopy01:15

Transmission Electron Microscopy

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In 1931, physicist Ernst Ruska—building on the idea that magnetic fields can direct an electron beam just as lenses can direct a beam of light in an optical microscope—developed the first prototype of the electron microscope. This development led to the development of the field of electron microscopy. In the transmission electron microscope (TEM), electrons are produced by a hot tungsten element and accelerated by a potential difference in an electron gun, which gives them up to 400...
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Fatigue01:21

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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...
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Related Experiment Video

Updated: Jan 15, 2026

Full-field Strain Measurements for Microstructurally Small Fatigue Crack Propagation Using Digital Image Correlation Method
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Full-field Strain Measurements for Microstructurally Small Fatigue Crack Propagation Using Digital Image Correlation Method

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Controlling Fatigue Cracks in the Transmission Electron Microscope.

Andrew Baker1, Kyle R Dorman2, Khalid Hattar3

  • 1Center for Integrated Nanotechnologies, Sandia National Laboratories, Albuquerque, NM, 87123, USA.

Small Methods
|October 16, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed a new method to control fatigue crack growth in situ Transmission Electron Microscopy (TEM) experiments. This quantitative approach allows detailed observation of nanoscale fatigue mechanisms in various materials and devices.

Keywords:
TEMcrackingfatiguenanocrystallinenanomechanics

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Nanotechnology

Background:

  • Fatigue cracking poses significant economic and safety risks in engineering.
  • In situ Transmission Electron Microscopy (TEM) offers insights into nanoscale fatigue origins.
  • Current nanoindenter-based TEM methods for observing crack propagation lack precise control.

Purpose of the Study:

  • To introduce a novel, quantitative control methodology for in situ TEM fatigue experiments.
  • To enable detailed observation of nanoscale fatigue damage mechanisms.
  • To provide a framework for comparing material responses to fatigue stress.

Main Methods:

  • Adoption of a control methodology from linear elastic fracture mechanics.
  • Utilizing a stress intensity factor (K) to quantify the driving force on fatigue cracks.
  • Demonstration on nanocrystalline Platinum (Pt) alloys using in situ TEM.

Main Results:

  • Successfully controlled fatigue crack growth over micrometers in situ.
  • Enabled observation of nanoscale damage mechanisms: blunting, closure, deflection, branching, healing, and fatigue-induced grain growth.
  • Established a quantitative basis for comparing material fatigue responses.

Conclusions:

  • The novel stress intensity factor-based method offers precise control for in situ TEM fatigue studies.
  • This approach facilitates the investigation of nanoscale cyclic degradation in diverse materials.
  • The methodology is applicable to structural materials and advanced nanotechnology applications.