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Ultrasonic Welding of Thermoplastic Composite Coupons for Mechanical Characterization of Welded Joints through Single Lap Shear Testing
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Optimization on ultrasonic plastic welding systems based on two-dimensional phononic crystal.

Sha Wang1, Shuyu Lin1

  • 1Shaanxi Key Laboratory of Ultrasonics, Shaanxi Normal University, Xi'an 710119, China.

Ultrasonics
|July 5, 2019
PubMed
Summary

This study introduces two-dimensional phononic crystals (PnC) to improve ultrasonic plastic welding of large objects. By using PnC, lateral vibrations are suppressed, leading to more uniform displacement for better welding results.

Keywords:
Lateral vibrationPhononic crystalUltrasonic plastic welding system

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Area of Science:

  • Materials Science
  • Acoustics
  • Mechanical Engineering

Background:

  • Large-sized tools for plastic welding often suffer from non-uniform displacement due to strong lateral vibrations.
  • Traditional grooving methods are experience-based and may not effectively address vibration issues.

Purpose of the Study:

  • To investigate the application of two-dimensional phononic crystals (PnC) in large-sized ultrasonic plastic welding tools.
  • To suppress lateral vibrations and improve displacement uniformity at the tool's radiation surface.

Main Methods:

  • Designed six ultrasonic plastic welding systems incorporating 2D PnC with varying groove dimensions.
  • Simulated and experimentally analyzed the vibration characteristics of these systems.
  • Analyzed the band gaps of the large-sized tools.

Main Results:

  • Lateral vibration was significantly suppressed when the operating frequency fell within the PnC tool's band gap.
  • The displacement distribution on the radiation surface became more uniform.
  • Demonstrated the effectiveness of PnC in controlling vibration modes.

Conclusions:

  • Two-dimensional phononic crystals offer a novel and effective approach to mitigate lateral vibrations in large ultrasonic plastic welding tools.
  • This method provides theoretical support for designing more efficient and precise large-scale ultrasonic plastic welding systems.