Composite material overview and its testing for aerospace components

Meola, Carosena; Boccardi, Simone; Carlomagno, Giovanni Maria

doi:10.1016/b978-0-08-102131-6.00005-0

Cited by 13 publications

(4 citation statements)

References 74 publications

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“…Figure 12A illustrates brittleness and crack growth in an unstable waydue to lower fracture toughness and fracture energy and it defining characteristic of failure in the presence of brittle fracture behavior 31 . Fiber pull‐out, fiber‐resin debonding, and damage to the fibers and matrix are just a few energy‐dissipating factors that contribute to the rise in fracture toughness of composites 32 …”

Section: Resultsmentioning

confidence: 99%

Effect of CNT filler and temperature on fracture toughness of epoxy composites reinforced with carbon fabric

Kiran,

Govindaraju,

Kumar

et al. 2023

Engineering Reports

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In present research the fracture behavior of carbon fabric‐epoxy composites (CE composites) was evaluated with the addition of 0.1, 0.2, 0.5, and 0.75 weight percentages of carbon nano tubes (CNTs) at different temperatures. The CE composites with different wt.% of CNT were fabricated using land layup method and cured by hot pressing. The fracture toughness of fabricated composites was evaluated in mode–I condition at different temperature. From the results it was shown that the highest fracture toughness was observed at 0.75 wt.% of reinforcement of CNT functional fillers. The fracture toughness of 0.75 wt.% CNT filled CE composites was increased by 19.73% compared to unfilled CE composites. The fracture toughness of CNT filled CE composites diminishes with increase in temperature and the composite filled with 0.75 wt.% CNT exhibits better fracture toughness than the unfilled CE composite at all the temperatures. The fracture toughness was improved by 57.76% and 71.65% at 40 and 60°C, respectively, at 0.75 wt.% reinforcement of CNT fillers. The fractured surfaces of composites were analyzed using Scanning Electron Microscope (SEM) to study the filler contribution to enhance the fracture toughness and failure mechanism of composites.

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Section: Resultsmentioning

confidence: 99%

Effect of CNT filler and temperature on fracture toughness of epoxy composites reinforced with carbon fabric

Kiran,

Govindaraju,

Kumar

et al. 2023

Engineering Reports

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“…Thermal cameras, based on these principles, can offer spatially resolved thermal images of a sample or scene. The possible applications for such technologies are very broad, finding utility in areas such as the study of irregularities in building envelopes [ 11 ], the testing of aerospace components [ 12 ], solar cells [ 13 ], microelectronic devices [ 14 ], or biomedicine [ 15 ]. However, determination of the temperature depends on knowledge of the emissivity of the measured surface.…”

Section: Introductionmentioning

confidence: 99%

Application of Synchrotron Radiation-Based Fourier-Transform Infrared Microspectroscopy for Thermal Imaging of Polymer Thin Films

Chávez‐Ángel

Sandell

et al. 2023

Polymers

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The thermal imaging of surfaces with microscale spatial resolution over micro-sized areas remains a challenging and time-consuming task. Surface thermal imaging is a very important characterization tool in mechanical engineering, microelectronics, chemical process engineering, optics, microfluidics, and biochemistry processing, among others. Within the realm of electronic circuits, this technique has significant potential for investigating hot spots, power densities, and monitoring heat distributions in complementary metal–oxide–semiconductor (CMOS) platforms. We present a new technique for remote non-invasive, contactless thermal field mapping using synchrotron radiation-based Fourier-transform infrared microspectroscopy. We demonstrate a spatial resolution better than 10 um over areas on the order of 12 000 um2 measured in a polymeric thin film on top of CaF2 substrates. Thermal images were obtained from infrared spectra of poly(methyl methacrylate) thin films heated with a wire. The temperature dependence of the collected infrared spectra was analyzed via linear regression and machine learning algorithms, namely random forest and k-nearest neighbor algorithms. This approach speeds up signal analysis and allows for the generation of hyperspectral temperature maps. The results here highlight the potential of infrared absorbance to serve as a remote method for the quantitative determination of heat distribution, thermal properties, and the existence of hot spots, with implications in CMOS technologies and other electronic devices.

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“…Today, many nondestructive testing (NDT) methods are available that can easily detect and feature the surface and internal structural discontinuities without causing any damage. Some of them are ultrasonic C-scan [3], ultrasound wave distortion indicator [4], and laser ultrasonic [5], to name a few. These techniques are costly and time-consuming to use for inspecting large structures.…”

Section: Introductionmentioning

confidence: 99%

Effect of Debonding on Guided Wave Propagation in Stiffened Composite Plate Under Operational Loading and Hygrothermal Environment

Kalgutkar,

Banerjee

2023

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Composite stiffened panels are extensively used in a wide range of engineering structures. However, these structures are subjected to external environmental and operational loading conditions, which may cause damage such as interlayer delamination or skin-stiffener interfacial debonding due to the development of enormous stresses. As a result, monitoring the induced hidden flaws and discontinuities in these structures becomes critical. Ultrasonicguided wave techniques exhibit an efficient and accurate approach for monitoring discontinuities or damages in composite structures. The current study proposes a multiphysics numerical simulation using commercially available finite element software COMSOL Multiphysics to study guided wave propagation in a stiffened composite plate debonded at the plate-stiffener interface with a piezoelectric transducer subjected to in-plane mechanical load and hygrothermal environment. The plate and PZT patch are modelled using the brick element, and the debond is simulated using a through-width groove of 0.1 mm depth in the attached stiffener. A detailed parametric investigation considers the variations in debonding size, in-plane load and hygrothermal load intensity. The results show that the magnitude of the A0 mode is high in the bonded panel, whereas the S0 mode amplitude is low. In contrary, the scattered wave shows high S0 mode amplitude and a relatively low A0 mode amplitude in the debonded panel. Furthermore, as the magnitude of the compressive edge load increases, the group velocity of the A0 mode decreases, whereas, the group velocity of the S0 mode doesn't change significantly. Also, the size of time interval of the A0 mode packet and its amplitude reduce with the rise in the moisture concentration.

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Composite material overview and its testing for aerospace components

Cited by 13 publications

References 74 publications

Effect of CNT filler and temperature on fracture toughness of epoxy composites reinforced with carbon fabric

Effect of CNT filler and temperature on fracture toughness of epoxy composites reinforced with carbon fabric

Application of Synchrotron Radiation-Based Fourier-Transform Infrared Microspectroscopy for Thermal Imaging of Polymer Thin Films

Effect of Debonding on Guided Wave Propagation in Stiffened Composite Plate Under Operational Loading and Hygrothermal Environment

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