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Mechanoluminescent Visualization of Crack Propagation for Joint Evaluation
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Visualization method for stress-field evolution during rapid crack propagation using 3D printing and photoelastic

Yang Ju1,2, Heping Xie3, Xi Zhao4

  • 1State Key Laboratory of Coal Resources and Safe Mining, China University of Mining & Technology, Beijing, 100083, China. juy@cumtb.edu.cn.

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Researchers developed a new method to visualize stress fields during rapid crack growth. This technique accurately captures stress evolution, revealing its strong influence on crack propagation velocity.

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Area of Science:

  • Solid mechanics
  • Materials science
  • Experimental physics

Background:

  • Understanding stress-field evolution during rapid fracture is crucial for engineering applications.
  • Directly capturing dynamic stress fields during crack propagation presents significant challenges.
  • Existing methods struggle with the rapid changes and complexities of stress fields near crack tips.

Purpose of the Study:

  • To develop and demonstrate an experimental method for quantitative visualization and characterization of stress-field evolution during rapid crack propagation.
  • To overcome the limitations of existing techniques in capturing dynamic stress fields.
  • To investigate the relationship between stress field dynamics and crack propagation velocity.

Main Methods:

  • Utilized 3D printing technology and a stress-sensitive photopolymer resin to create a transparent disc model with a fusiform crack.
  • Employed a synchronized high-speed digital camera and a nanosecond pulsed laser system for photoelastic testing.
  • Captured the rapid evolution of the stress field in the vicinity of crack tips.

Main Results:

  • Successfully visualized and quantitatively characterized the dynamic stress-field evolution during crack propagation.
  • Demonstrated the suitability of the proposed method for analyzing rapid fracture events.
  • Confirmed a strong correlation between the stress field around crack tips and crack propagation velocity.

Conclusions:

  • The developed experimental method provides a powerful tool for studying dynamic fracture mechanics.
  • Accurate characterization of stress fields is essential for understanding and predicting material failure.
  • The findings contribute to the fundamental understanding of the mechanisms governing the deformation and failure of solids.