Microscale sensor solution for data collection from fibre-matrix interfaces

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 $$7\,\upmu \hbox {m}$$ 7 μ m , making the monolithic compliant structure the first instrument capable of force-strain data output for bonded filament-droplet specimens.

Multiscale Computational and Artificial Intelligence Models of Linear and Nonlinear Composites: A Review

“…State-of-the-art sensors such as fiber Bragg grating (FBG) and strain-sensing compound basic parallelogram mechanism (CBPM)-FBG holders have been shown to have superior sensitivity during the MB tests for both synthetic and natural composite filaments. [110] Recently, X-ray computed tomography (X-ray CT) images of carbon fiber-reinforced polymer (CFRP) have been used to generate microscale FEM. X-ray and micro-CT is another popular imaging tool to characterize materials and generate 3D visualizations of objects nondestructively.…”

Mutual dependence of experimental and data analysis features in characterization of fiber‐matrix interface via microdroplets

“…Typically, the force and displacement of the blades are recorded. 3,10 For multiple droplets tested, linear regression to the F max data for a wide range of droplet sizes (and embedded areas) is used to estimate the apparent interfacial shear strength (IFSS). In the general context of continuums, an interface is a contact between two materials that can have different physical or mechanical properties.…”

“…Eventually, the droplet is fully debonded. Typically, the force and displacement of the blades are recorded 3,10 . For multiple droplets tested, linear regression to the data for a wide range of droplet sizes (and embedded areas) is used to estimate the apparent interfacial shear strength (IFSS).…”