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High-Frequency Ultrasonic Spectroscopy of Structure Gradients in Injection-Molded PEEK Using a Focusing Transducer.

Jannik Summa1, Moritz Kurkowski2, Christian Jungmann1

  • 1Fraunhofer Institute for Non-Destructive Testing IZFP, 66123 Saarbrücken, Germany.

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Summary
This summary is machine-generated.

High-frequency ultrasonic spectroscopy (HF-US) maps mechanical properties in polyether-ether-ketone (PEEK) by analyzing crystalline structures. This technique reveals how material morphology influences performance in thermoplastic materials.

Keywords:
PEEKhigh-frequency ultrasonic testingmorphological gradientproperty imaging

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Area of Science:

  • Materials Science
  • Polymer Physics
  • Non-destructive Testing

Background:

  • High-performance thermoplastic material behavior is dictated by crystallization degree and phase distribution.
  • Microstructural inhomogeneity arises from differing amorphous and crystalline phase stiffness and anisotropy.
  • Microstructure imaging is crucial for characterizing process-induced morphology and resultant material properties.

Purpose of the Study:

  • To apply high-frequency ultrasonic spectroscopy (HF-US) for characterizing injection-molded polyether-ether-ketone (PEEK) tensile specimens.
  • To investigate the relationship between process-related morphologies and material mechanical properties.
  • To demonstrate analysis procedures for mapping gradual mechanical properties and correlating them with crystalline content.

Main Methods:

  • Utilized focusing ultrasonic transducers with a nominal center frequency of 25 MHz for high lateral resolution imaging.
  • Employed high-frequency ultrasonic spectroscopy (HF-US) on PEEK tensile specimens exhibiting varied morphologies.
  • Applied analysis procedures including backwall echo, time of flight, and Fourier-transformed time signals.

Main Results:

  • HF-US successfully enabled imaging of PEEK specimens with high lateral resolution.
  • Wave propagation analysis correlated with elastic modulus, density, and damping.
  • Mapping of gradual mechanical properties was achieved, linked to specific crystalline content and morphological zones.

Conclusions:

  • HF-US is an effective technique for characterizing the microstructure and mechanical properties of PEEK.
  • The study demonstrates the capability of HF-US to relate material morphology to performance.
  • This method facilitates a deeper understanding of thermoplastic material behavior influenced by processing.