Electrical resistance measurement for in situ monitoring of fatigue of carbon fabric composites

Baere, Ives De; Paepegem, Wim Van; Degrieck, Joris

doi:10.1016/j.ijfatigue.2009.02.044

Cited by 46 publications

(18 citation statements)

References 20 publications

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“…CFRP materials have been widely studied, since their electrical resistance is very sensitive to fiber breakage (carbon fibers are a good electrical conductor unlike the polymeric matrix), which is one of the main damage modes in on-axis tension. ER monitoring during room-temperature fatigue tests has been investigated [14,18], leading for some materials to fatigue life prediction criteria [19]. Recently, the idea of extending the four-probe methods to several pairs of strategically located leads has led to bi-dimensional ER mapping of damage [20], which opens a great field of potential applications.…”

Section: Introductionmentioning

confidence: 99%

Electrical resistivity monitoring of a SiC/[Si-B-C] composite under oxidizing environments

2017

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International audienceThe introduction of Ceramic Matrix Composites parts in civil aeronautics requires a thorough understanding of their evolution under the oxidizing environments present within the engines. In this respect, a SiC f /PyC/[Si-B-C] m material has been tested in fatigue at 450°C and 100 MPa (which is a typical stress during takeoff) under two types of environmental conditions: ambient air, and moist air with an imposed water pressure of 10 kPa. Static fatigue and cyclic fatigue at a frequency of 1 Hz were both performed with these two conditions. As expected, the additional presence of moisture contributes to increase the degradation of the mechanical properties of the material, leading to shorter lifetimes and higher increases in electrical resistivity. It is shown that the pyrocarbon interphases are the main electrical conductors in this material: the electrical resistance can therefore be an accurate indicator of the damage state of these interphases, which are sensitive to the oxidizing environment. The global resistance increase presents two distinct phases of evolution in the four tests performed, with a transition around 35-40% of the time to failure. A model is proposed to account for this global resistance change, which proves to be in good agreement with experimental results. Moreover, the evolution of the electrical resistivity during the interposed unload-reload cycles can give key information about the state of the 2 fiber/matrix interfaces which are critical for mechanical properties. Finally, electrical resistance monitoring seems to provide information on the damage state of the material complementary to acoustic emission results, allowing an unprecedented assessment of the evolution of the interphases state during ageing under oxidizing environments

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Section: Introductionmentioning

confidence: 99%

Electrical resistivity monitoring of a SiC/[Si-B-C] composite under oxidizing environments

2017

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“…An increase in electrical resistance with increasing longitudinal tensile strain was observed for both composites. The change in relative resistance with unit mechanical strain is defined as gauge factor (k) defined as follows: (2) Under tensile strains, the value of k varies from 1 to 2.1 for the CF-CNT-epoxy composite and from 0.94 to 1.85 for the CF-epoxy composite. This is in good agreement with the reported values, e.g.…”

Section: A Tensile Testsmentioning

confidence: 99%

“…strain gauges and optical fibre sensors, resistance measurement based strain self-sensing is more economical and convenient, because materials themselves act as the sensors and no embedded or attached devices are required. Numerous researches have been conducted to explore the electromechanical behaviour of carbon fibre reinforced polymers [1][2][3][4] . Owston is one of the earliest researcher who investigated the change in electrical resistance as a function of mechanical strain for a single fibre 5 .…”

Section: Introductionmentioning

confidence: 99%

Self-sensing of Strain in Carbon Nanotube Modified Carbon Fibre Reinforced Composites

Liu

Hubert

2014

55th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference

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The aim of this work was to systematically investigate the influence of CNT addition on strain self-sensing of CF based composites. By comparing the electromechanical behaviour of CF-epoxy and CF-CNT-epoxy composites, it was found that the addition of CNTs improves the sensitivity and the reproducibility of the electric responses to mechanical loading. These improvements are mainly attributed to the lower and more even value of CF-CF contact resistance and the more homogeneous distribution of CF-CF contact position. In addition, an analytical model was used to simulate the change in surface resistance on tensile and compressive sides of the CF-epoxy specimen with three-point bending loading. With sensitivity analysis, it was found that the surface resistance was mostly sensitive to the longitudinal resistance. However, the change in through-thickness resistance played a dominated role in affecting the surface resistance with mechanical loading, particularly on the compressive side. Nomenclature D= the maximum deflection of the center of the specimen d = the thickness of the specimen L = support span k = gauge factor ε = mechanical strain ∆R = resistance change R 0 = the resistance at zero strain v = Poisson's ratio = the longitudinal resistivity of the lamina = the distance between electrodes t = the thickness of one lamina b = the width of the specimen = the through-thickness resistivity of the specimen t(i) = the distance between i and i+1 laminae M = the moment at the cross-section y = the distance to neutral layer E = flexural modulus = area moments of inertia P = the three-point bending load x = the distance to the right support = gauge factor of longitudinal resistance with tensile strain = gauge factor of longitudinal resistance with compressive strain = gauge factor of through-thickness resistance with tensile strain = gauge factor of through-thickness resistance with compressive strain 1 Master Student, Department of Mechanical Engineering, 817 Sherbrooke St. West, AIAA member. 2 Professor, Department of Mechanical Engineering, 817 Sherbrooke St. West, AIAA Associate Fellow. Downloaded by KUNGLIGA TEKNISKA HOGSKOLEN KTH on July 29, 2015 | http://arc.aiaa.org |

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“…If this kind of fatigue damage cannot be detected in time, it may continue to grow with new emerging damage patterns such as delamination and fiber breakages, leading to catastrophic failure of the structures [1,2]. Thus it is very important and crucial to develop structural health monitoring (SHM) techniques to detect the fatigue damage inside composite structures and, if possible, to continuously monitor its evolution [3][4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Guided Wave-Based Monitoring of Evolution of Fatigue Damage in Glass Fiber/Epoxy Composites

Yan

Tang

2019

Applied Sciences

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This paper presents an experimental study on detecting and monitoring of evolution of fatigue damage in composites under cyclic loads by using guided waves. Composite specimens fabricated by glass fiber/epoxy laminates and surface mounted with piezoelectric wafers are fatigued under tension–tension loads. A laser extensometer is used to obtain the degradation of longitudinal stiffness of the specimens under fatigue states to reflect the accumulation of internal fatigue damage. Meanwhile, at different fatigue cycles, one wafer acts as actuator to excite diagnostic guided waves, and the other acts as sensor to receive corresponding response waves. These guided wave signals are then processed by wavelet packet transform to extract characteristic features of energies in multiple frequency bands. A statistical multivariate outlier analysis is then performed to determine the existence of fatigue damage and to characterize their evolution using Mahalanobis squared distance. Experimental results have demonstrated the potential applicability and effectiveness of guided waves for continuous monitoring of fatigue damage in composite structures.

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Electrical resistance measurement for in situ monitoring of fatigue of carbon fabric composites

Cited by 46 publications

References 20 publications

Electrical resistivity monitoring of a SiC/[Si-B-C] composite under oxidizing environments

Electrical resistivity monitoring of a SiC/[Si-B-C] composite under oxidizing environments

Self-sensing of Strain in Carbon Nanotube Modified Carbon Fibre Reinforced Composites

Guided Wave-Based Monitoring of Evolution of Fatigue Damage in Glass Fiber/Epoxy Composites

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