Strain mapping at the micro-scale in hierarchical polymer composites with aligned carbon nanotube grafted fibers

Mehdikhani, Mahoor; Matveeva, Anna; Aravand, Mohammadali; Wardle, Brian L.; Gorbatikh, Larissa

doi:10.1016/j.compscitech.2016.10.021

Cited by 43 publications

(14 citation statements)

References 33 publications

(27 reference statements)

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“…However, it is not easy for nontransparent materials, as Carbon Fibre Reinforced Polymer (CFRP) composites. Digital Image Correlation (DIC) is a popular method used for strain measurement and damage detection on material surface [2], [39], [40], [41], [42], [43], [44], [45], [46], [47], [48], [49]. It can provide a direct correlation of surface cracks with AE recordings but not for micro damage in the inner plies.…”

Section: Debondingmentioning

confidence: 99%

Multi-instrument in-situ damage monitoring in quasi-isotropic CFRP laminates under tension

Öz

Ersoy

Mehdikhani

2018

Composite Structures

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Digital Image Correlation monitoring of the surface strains, microscopic in-situ observations of the micro-damage on the specimen edge and Acoustic Emission (AE) are utilized simultaneously during tension tests of quasi-isotropic carbon fibre reinforced polymer composites. It is found that the cluster analysis for characteristic parameters of AE events (the main being the signal amplitude and frequency) does not unambiguously identify the type of damage which causes the event. With optical instruments, it is observed that the signatures of AE events depend on the position of the ply where damage happens and on the ply orientation (90° vs 45°). Robust evidences for the variations in AE characteristics of damage modes in different lay-ups are presented. AE events, originated from surface cracks, have high amplitude and low frequency, whereas AE events, originated from transverse cracks in the inner plies, have low amplitude and high frequency characteristics. Any conclusion for fibre breaks are not reached in this study. Therefore, measurements in this study rather point out that the AE events, which could be interpreted as fibre breaks because of their high frequency characteristics, as optical observations prove, correspond to other damage types in quasiisotropic laminates.

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Section: Debondingmentioning

confidence: 99%

Multi-instrument in-situ damage monitoring in quasi-isotropic CFRP laminates under tension

Öz

Ersoy

Mehdikhani

2018

Composite Structures

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“…We show the electricity-adaptive softening during tensile tests in situ using digital image correlation (DIC) of speckle patterns to visualize the local deformation as color-coded strain maps with high spatiotemporal resolution. 57,58,59,60 In the first scenario, we used a film covered completely with a SWNT layer, but moved the electrodes from the edge of the films that we used before ( Fig. 2a and Fig.…”

Section: Reconfigurable Electrical Switching Of Mechanical Patternsmentioning

confidence: 99%

Electrical Switching of High-Performance Bioinspired Nanocellulose Nanocomposites

Jiao

Lossada

Guo

et al. 2020

Preprint

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Nature fascinates with living organisms showing mechanically adaptive behavior. In contrast to gels or elastomers, it is profoundly challenging to switch mechanical properties in stiff bioinspired nanocomposites as they contain high fractions of immobile reinforcements. Here, we introduce facile electrical switching to the field of bioinspired nanocomposites, and show how the mechanical properties adapt to low direct current (DC). This is realized for renewable cellulose nanofibrils/polymer nanopapers with tailor-made interactions by deposition of thin single-walled carbon nanotube electrode layers for Joule heating. Application of DC at specific voltages translates into significant electro-thermal softening via dynamization and breakage of the thermo-reversible supramolecular bonds. The altered mechanical properties are reversibly switchable in power on/power off cycles. Furthermore, we showcase electricity-adaptive patterns and reconfiguration of deformation patterns using electrode patterning techniques. The simple and generic approach opens avenues for bioinspired nanocomposites for facile application in adaptive damping and structural materials, and soft robotics.

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“…187–190 The deformations predicted by the model were consistent with the deformation maps measured experimentally using a specially developed digital image correlation technique at the micro-scale. 191…”

Section: Nano-engineered Composites: Modelling Processing and Characmentioning

confidence: 99%

Contributions of Stepan V Lomov to the research and development of composite materials

Jain

Boisse

Carvelli

et al. 2020

Journal of Composite Materials

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This paper presents a comprehensive review of the scientific and engineering contributions of Prof. Stepan V. Lomov in a career spanning over 3 decades. Starting from his early work on the modelling of dry textiles, different aspects of composite materials have benefited from his inspiring contribution. His wide scientific curiosity drove the research on several topics, covering permeability, forming, damage, fatigue, nano-engineered composites, as well as development of analytical and numerical models at different scales. The paper presents a full spectrum of his scientific career aiming to link his achievements and the future research on composite materials.

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Strain mapping at the micro-scale in hierarchical polymer composites with aligned carbon nanotube grafted fibers

Abstract: Strain mapping at the micro-scale in hierarchical polymer composites with aligned carbon nanotube grafted fibers The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters.

Cited by 43 publications

References 33 publications

Multi-instrument in-situ damage monitoring in quasi-isotropic CFRP laminates under tension

Multi-instrument in-situ damage monitoring in quasi-isotropic CFRP laminates under tension

Electrical Switching of High-Performance Bioinspired Nanocellulose Nanocomposites

Contributions of Stepan V Lomov to the research and development of composite materials

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