| Abstract Scope |
This study presents a comparative study on the performance of three transducers operating in longitudinal mode and longitudinal-torsional hybrid vibration modes on the strength of ultrasonic spot welding in polyethylene sheets.
Ultrasonic welding experiments were conducted using the transducer prototypes to evaluate their performance relating the strength and ductility of the welded samples.
Modal and harmonic analyses were conducted in a finite element method (FEM) environment to compare the dynamic characteristics of the transducers, focusing on the vibration modes and corresponding resonance frequencies of the transducers and the amplitudes of longitudinal and torsional vibration displacements at their horn tips.
The experimental results representing the mechanical properties of the samples were related to the results of numerical analyses to provide insights for designing better transducers.
Keywords: ultrasonic transducer, longitudinal–torsional (L&T) hybrid vibration, finite element analysis, ultrasonic spot welding, thermoplastics. |