Microstructural damage based modeling of thermal conductivity of cyclically loaded CFRP

Hiremath, Chandrashekhar; Senthilnathan, K.; Naik, N.K.; Guha, Anirban; Tewari, Ashish

doi:10.1016/j.compscitech.2017.11.011

Cited by 11 publications

(14 citation statements)

References 22 publications

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“…The length of these short ellipsoidal fibers was considered equal to the average length between two fiber cracks to account for fiber damage. Average length between two fiber cracks, l, was then given by 3 where LV (=(VV)f/πrf2) is the length of fibers per unit volume of the composite, true(VVtrue)f is the fiber volume fraction, rf is the average fiber radius, and true(NVtrue)f is the number of fiber cracks per unit volume (fiber crack density) of the composite. To consider interface debonding, a fraction of ellipsoidal fibers, with total interface area equal to the debonded area, was considered as completely debonded.…”

Section: Mean Field Micromechanics Modelmentioning

confidence: 99%

Microstructural damage based micromechanics model to predict stiffness reduction in damaged unidirectional composites

Hiremath

Senthilnathan

Naik

et al. 2018

Journal of Reinforced Plastics and Composites

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Prediction of the residual stiffness of the carbon fiber reinforced polymer composite, subjected to fatigue loading, can be performed using some of the phenomenological models. However, it is still a challenge to find the stiffness based on the known microstructural damage state (that was developed irrespective of the load history). In this work, two micromechanics-based models were developed to predict reduction in the stiffness of the damaged composite. Fiber crack density and interface debonding was used to define the microstructural damage state of the composite. These models account for the fiber crack density in the form of change in either geometry (equivalent ellipsoid model) or material property of the fiber (reduced stiffness model). The microstructural damage state in the unidirectional carbon fiber reinforced polymer composite, obtained from the on-axis tension–tension fatigue loading, was used to validate the models. The results from reduced fiber stiffness model were compared against experiment and finite element analysis for the given microstructural damage. The stiffness obtained using reduced fiber stiffness model was in good agreement with that obtained from the experiment. However, reduced fiber stiffness model underestimated reduction in stiffness compared to finite element analysis.

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Section: Mean Field Micromechanics Modelmentioning

confidence: 99%

Microstructural damage based micromechanics model to predict stiffness reduction in damaged unidirectional composites

Hiremath

Senthilnathan

Naik

et al. 2018

Journal of Reinforced Plastics and Composites

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“…Hence, many damage models were developed to simulate growth of damage in composite materials. Two main important approaches were followed in the literature to investigate the damage behavior of a composite lamina, experimental damage-inspection (Chowdhury et al., 2018; Hiremath et al., 2018; Huang et al., 2019; Zhao et al., 2018) using electronic-microscopy and damage-modeling (Abu-Farsakh and Asfa, 2018; Abu-Farsakh et al., 1999; Christian et al., 2018; Kattan and Voyiadjis, 1993; Schapery, 1990; Okabe et al., 2018; Pineda and Waas, 2013; Zhao et al., 2018) using macro- and micro-mechanical approaches.…”

Section: Introductionmentioning

confidence: 99%

“…By using pulse thermography, thermal conductivity can be used to trace microstructural damage localization and growth. Hiremath et al. (2018) proposed a new model which assumed that material thermal resistance changes with the evolution of damage due to interface debonding and fiber-breakage during fatigue loading.…”

Section: Introductionmentioning

confidence: 99%

A unified damage model for fibrous composite laminae subject to in-plane stress-state and having multi material-nonlinearity

Abu‐Farsakh

Asfa

2020

International Journal of Damage Mechanics

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In the present study, a novel methodology of damage modeling is introduced to predict damage propagation in fibrous composite materials according to the plastic strain energy density induced in the lamina only. The importance of the new damage-model is the ability to assess damage-evolution in fibrous composite laminae irrespective of stress-state and fiber-orientation angle. An energy-based model called as a unified damage model, is proposed to evaluate damage in unidirectional fibrous composite laminae. The aforementioned damage model represents a unique relationship between damage-evolution and the resulting plastic strain energy density induced in the composite lamina, as verified through this study. Damage propagation under a state of in-plane-stress is investigated for three composite laminas; boron/epoxy, graphite/epoxy, and carbon/epoxy. The unified damage model represents a simplified mathematical relation of quantum-damage (or modified-damage) variables in terms of the induced plastic-strain-energy density induced in a composite lamina. The developed unified damage model confirms the results of Ghazi-Ahmad macro-mechanical damage model in which graphite/epoxy has the lowest damage response, whereas boron/epoxy has the highest possible damage response amongst the three composite materials. Also, it is noticed that quantum-damage propagates nonlinearly with the evolved plastic strain energy density in fibrous composite laminae.

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“…Few techniques have been proposed in literature, such as thermography, acoustic emission, and fibre optics [5,6,7]. The thermography method is used to examine subsurface damage, the technique uses energy radiated from the composite surface and infrared camera to monitor heat flux at composite material surfaces [8].…”

Section: Introductionmentioning

confidence: 99%

“…This makes CFRP an inherently smart material, as changes in the electrical conductivity will occur as deformation or damage occur within the structure [29][30] [31]. It also means that electrical conductivity measurements in CFRP laminates have the potential to out-perform other methods, such as fibre optics, thermography, and acoustic methods, as it employs carbon fibres themselves as the sensing element, removing the need for additional sensors to be added [32,33,5].…”

Section: Introductionmentioning

confidence: 99%

Structural health monitoring for woven fabric CFRP laminates

Al-Saadi

Meredith

Swait

et al. 2019

Composites Part B: Engineering

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Structural health monitoring is directly linked to structural performance, hence it is one of the main parameters in the safety of operation. This paper presents the development of an innovative structural health monitoring system for woven fabric carbon fibre reinforced polymer (CFRP) laminates fabricated using both vacuum assisted resin transfer moulding and pre-preg technique. The sensing system combines the ability to monitor strain due to applied loads, as well as to detect, and assess damage due to low velocity impact events. Bending loads were applied on a beam-type specimen and changes in electrical resistance, due to piezoresistivity of carbon fibres, were monitored. The change in electrical resistance was a function of applied load and reversible up to 0.13 % strain. Two thicknesses of composite panel, 2.09 (vacuum assisted resin transfer moulding) and 1.63 mm (pre-preg) were made, and were subjected to a range of low velocity impact energies. The resultant damage areas, as measured using ultrasonic C-scanning, were plotted against changes in electrical resistance to provide a correlation plot of damage area against impact energy. An inverse analysis, using this correlation plot, was performed to predict the damage area from a

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Microstructural damage based modeling of thermal conductivity of cyclically loaded CFRP

Cited by 11 publications

References 22 publications

Microstructural damage based micromechanics model to predict stiffness reduction in damaged unidirectional composites

Microstructural damage based micromechanics model to predict stiffness reduction in damaged unidirectional composites

A unified damage model for fibrous composite laminae subject to in-plane stress-state and having multi material-nonlinearity

Structural health monitoring for woven fabric CFRP laminates

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