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Area of Science:

  • Solid Mechanics
  • Materials Science
  • Wave Physics

Background:

  • Accurate assessment of axial stress and neutral temperature is crucial for structural integrity.
  • Existing nondestructive evaluation (NDE) methods may have limitations in thick beams.
  • Thermal stress can significantly impact beam stiffness and behavior.

Purpose of the Study:

  • To develop and validate a novel NDE method for inferring neutral temperature and axial stress in thick beams.
  • To investigate the influence of axial stress on the propagation characteristics of nonlinear solitary waves.
  • To establish a reliable method for structural health monitoring in critical components.

Main Methods:

  • Generation and analysis of highly nonlinear solitary waves in a chain of particles in contact with the beam.
  • Coupling of a finite element model (FEM) for thermally stressed beams with a discrete particle model (DPM).
  • Experimental validation to assess repeatability, sensitivity to thermal stress, and independence from neutral temperature.

Main Results:

  • The amplitude and speed of reflected solitary waves are demonstrably affected by axial stress.
  • Numerical and experimental results confirm the hypothesis linking wave features to axial stress.
  • The method shows sensitivity to thermal stress and independence from neutral temperature.

Conclusions:

  • The proposed NDE method effectively infers axial stress and neutral temperature in thick beams.
  • This technique holds potential for applications in stress assessment of columns and continuous welded rails.
  • Findings contribute to preventing thermal buckling in critical structures through advanced monitoring.