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Microscale sensor solution for data collection from fibre-matrix interfaces.

Royson Dsouza1, Paulo Antunes2,3, Markus Kakkonen4,5

  • 1Faculty of Engineering and Natural Sciences, Tampere University, PO Box 589, 33014, Tampere, Finland. royson.dsouza@tuni.fi.

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Summary
This summary is machine-generated.

A new strain-sensing holder integrates Fiber Bragg Grating (FBG) sensors for microbond (MB) testing. This innovation provides crucial force-strain data for analyzing filament-matrix adhesion in microscale mechanics applications.

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Nanotechnology

Background:

  • Accurate microscale mechanics data is vital for miniature products, dental, and medical applications using fibrous composites.
  • Traditional microbond (MB) testing yields limited force data, hindering the analysis of complex interface crack fracture parameters.
  • Understanding momentary reaction force and local strain is fundamental for mechanical analysis of material interfaces.

Purpose of the Study:

  • To develop and analyze a novel monolithic compliant structure with an integrated Fiber Bragg Grating (FBG) sensor for enhanced microbond testing.
  • To enable simultaneous measurement of force and local strain during microbond testing of single filaments.
  • To overcome the limitations of traditional MB test systems in resolving multi-mode interface crack parameters.

Main Methods:

  • Development of a monolithic compliant structure integrated with an FBG sensor.
  • Mathematical and finite element (FE) modeling to estimate the stiffness of the compliant structure.
  • Qualification experiments using MB testing on synthetic (carbon, glass) and natural (flax) filaments.
  • Quasi-static and dynamic FE analysis to interpret the compliant structure's response during MB testing.

Main Results:

  • Successful MB testing of synthetic and natural single filaments using the developed strain-sensing holder.
  • Demonstrated excellent sensitivity of the CBPM-FBG holder for filaments with diameters as low as [Formula: see text].
  • The developed instrument provides the first force-strain data output for bonded filament-droplet specimens in MB testing.

Conclusions:

  • The developed monolithic compliant structure with an integrated FBG sensor significantly advances microbond testing capabilities.
  • This novel instrument provides essential force-strain data, crucial for detailed mechanical analysis of filament-matrix interfaces.
  • The technology is poised to improve the design and application of fibrous composites in demanding microscale fields.