Abstract
Especially the applications of fibrous composites in miniature products, dental and other medical applications require accurate data of microscale mechanics. The characterization of adhesion between single filament and picoliter-scale polymer matrix usually relies on the experiments using so-called microbond (MB) testing. The traditional MB test systems provide unitary data output (i.e., converted force) which is enigmatic in resolving the fracture parameters of multi-mode interface cracks. As a fundamental basis, the momentary reaction force and respective local strain at the location of a non-ambiguous gradient are needed for a mechanical analysis. In this paper, a monolithic compliant based structure with an integrated Fiber Bragg Grating (FBG) sensor is developed and analysed. The stiffness of the compliant structure is estimated by using mathematical and finite element (FE) models. Qualification experiments are carried out to confirm the functional performance: MB testing of synthetic (carbon and glass) and natural (flax) single filaments are successfully performed. Quasi-static and dynamic analysis of the MB testing is carried out by using the FE method to interpret the response of the compliant structure. The developed strain-sensing CBPM-FBG holder shows excellent sensitivity during the MB tests for both synthetic and natural filaments, even at a low filament diameters as low as 7,upmu hbox {m}, making the monolithic compliant structure the first instrument capable of force-strain data output for bonded filament-droplet specimens.
Highlights
The applications of fibrous composites in miniature products, dental and other medical applications require accurate data of microscale mechanics
The Fiber Bragg Grating (FBG) is based on the periodic perturbation of the refractive index along the direction of the fibre
This work analyzed and qualified a completely novel system where the strain sensing by using a tailored FBG sensor in an optical fibre is combined with an titanium-integrated compound basic parallelogram mechanism (CBPM) stage for deformation scaling and test specimen replacements
Summary
The applications of fibrous composites in miniature products, dental and other medical applications require accurate data of microscale mechanics. The developed strain-sensing CBPM-FBG holder shows excellent sensitivity during the MB tests for both synthetic and natural filaments, even at a low filament diameters as low as 7 μm , making the monolithic compliant structure the first instrument capable of force-strain data output for bonded filament-droplet specimens. The device outputs include only force recordings and specimen or blade displacement from a sensor or the control signal (i.e., blade or grip area of the filament depending on the test method)[15]. The MB test is prone to various sources of errors, such as load measurement, device optics and resin curing, which can lead to high scattering in test r esults[18] Through the years, these drawbacks have prevented researchers from producing reliable interface data and highly optimized composite applications
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