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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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Plastic deformation represents a fundamental concept in materials science, which explains the irreversible change in the shape of a material when it experiences stress beyond its elastic capability. This phenomenon is important in structural engineering, especially in designing and analyzing cantilever beams—structures that are securely fixed at one end and bear loads at the opposite end. When these beams are subjected to loads within their elastic range, they will return to their...
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Updated: Apr 1, 2026

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Cyclic Deformation in Metallic Glasses.

Z D Sha1, S X Qu2, Z S Liu1

  • 1International Center for Applied Mechanics, State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi'an Jiaotong University , Xi'an 710049, China.

Nano Letters
|October 1, 2015
PubMed
Summary
This summary is machine-generated.

Molecular dynamics simulations reveal atomic-level fatigue mechanisms in metallic glasses (MGs). Shear band initiation, driven by shear transformation zones (STZs), dictates fatigue life, with higher frequencies increasing cycles to failure.

Keywords:
Metallic glassfatigue mechanismmolecular dynamics simulationshear band formation

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Area of Science:

  • Materials Science
  • Computational Materials Science
  • Mechanical Engineering

Background:

  • Metallic glasses (MGs) are crucial engineering materials, yet their fatigue mechanisms lack atomic-level understanding despite extensive research.
  • Existing experimental studies have not fully elucidated the fundamental processes governing fatigue behavior in MGs.

Purpose of the Study:

  • To investigate the atomic-level mechanisms of tension-compression fatigue in metallic glasses (MGs) using molecular dynamics simulations.
  • To understand the distinct processes of shear band (SB) initiation under cyclic loading compared to monotonic loading.

Main Methods:

  • Performing molecular dynamics (MD) simulations of Cu50Zr50 MGs under strain-controlled cyclic loading.
  • Analyzing the accumulation and behavior of shear transformation zones (STZs) during fatigue progression.

Main Results:

  • Shear band (SB) initiation under cyclic loading differs from monotonic loading, occurring when surface STZ aggregates reach critical size.
  • STZ accumulation follows a power law dependent on applied strain, with almost all fatigue life spent in the initiation stage for nanoscale MGs.
  • Higher cycling frequencies were qualitatively shown to increase the number of cycles to failure.

Conclusions:

  • This study provides fundamental insights into the atomic-level fatigue mechanisms of metallic glasses.
  • The findings on STZ accumulation and SB initiation offer a basis for developing strategies to enhance MG fatigue resistance in engineering applications.