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Updated: Nov 12, 2025

Ultrasonic Welding of Thermoplastic Composite Coupons for Mechanical Characterization of Welded Joints through Single Lap Shear Testing
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Strength evolution laws in curing of solvent-welded polymers.

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Summary

Polymer interface strength increases with the square root of curing time, driven by diffusion. Dissolution kinetics offer a simpler method to predict strength development.

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Area of Science:

  • Materials Science
  • Polymer Science
  • Physical Chemistry

Background:

  • Understanding solvent-mediated interfaces is crucial for polymer processing.
  • Thermoplastic polymer interfaces below glass-transition temperature exhibit complex time-dependent behavior.

Purpose of the Study:

  • To establish scaling laws for solvent-mediated strength evolution at polymer interfaces.
  • To elucidate the mechanisms controlling interfacial strength development.
  • To correlate polymer particle dissolution with solvent-welding kinetics.

Main Methods:

  • Experimental characterization of interfacial properties.
  • Continuum scale simulations.
  • Analysis of time-evolution scaling laws (e.g., sqrt[t]).
  • Gaussian process modeling.

Main Results:

  • Interfacial strength, stiffness, and toughness scale as the square root of curing time (sqrt[t]).
  • Pure diffusion governs the evolution of these properties.
  • Strength saturation is accurately described by an exponential law, not a power law.
  • Polymer particle dissolution kinetics correlate with solvent-welding, offering a simpler strength prediction method.

Conclusions:

  • The time-evolution of solvent-mediated polymer interface strength follows predictable scaling laws.
  • Diffusion is the primary mechanism controlling interfacial property development.
  • Polymer particle dissolution provides a practical alternative for predicting interface strength.