Modelling the correlation between the electrical resistance and stiffness degradation in conductive composite laminates with complex damage scenarios

2021 ◽  
pp. 114914
Author(s):  
M. Zappalorto ◽  
P.A. Carraro ◽  
M. Quaresimin
Keyword(s):  
Electrical Resistance ◽  
Composite Laminates ◽  
Stiffness Degradation ◽  
Conductive Composite ◽  
Damage Scenarios

Prediction of stiffness degradation in hygrothermal aged [θm/90n]S composite laminates with transverse cracking

2008 ◽  
Vol 199 (1-3) ◽  
pp. 199-205 ◽  
Author(s):  
E.A. Adda-bedia ◽  
M. Bouazza ◽  
A. Tounsi ◽  
A. Benzair ◽  
M. Maachou
Keyword(s):  
Composite Laminates ◽  
Stiffness Degradation ◽  
Transverse Cracking

NUMERICAL PREDICTION OF STIFFNESS DEGRADATION OF THIN-PLY CFRP LAMINATES UNDER FATIGUE LOADING

2021 ◽  
Author(s):  
RYOMA AOKI ◽  
RYO HIGUCHI ◽  
TOMOHIRO YOKOZEKI
Keyword(s):  
Composite Laminates ◽  
Damage Mechanics ◽  
Crack Density ◽  
Continuum Damage Mechanics ◽  
Fatigue Loading ◽  
Stiffness Degradation ◽  
Cfrp Laminates ◽  
Mechanics Model ◽  
Element Simulation ◽  
Proposed Model

This study aims to conduct a fatigue simulation for predicting the stiffness degradation of thin-ply composite laminates with several ply thicknesses. For the simulation, a fatigue evolution model of intra-laminar damage in thin-ply composite laminates considering the effect of ply thickness was proposed. The intra-laminar damage evolution was modeled using the continuum damage mechanics model and the static and fatigue evolution law were formulated by relating the transverse crack density to the damage variable. The finite element simulation using the proposed model was conducted to predict the stiffness degradation of the laminates as a function of the number of loading cycles. The simulation results show that the experimental data can be reproduced by using the proposed fatigue model.

Flexible Liquid Sensor Based on Rubber/Graphite Composite

2020 ◽  
Vol 18 (4) ◽  
pp. 246-252
Author(s):  
Mohammad Khabiri ◽  
Milad Saadat Tagharoodi ◽  
Mohammad Reza Pourhossainy ◽  
Mashhood Abbasi ◽  
Mohamoud Razavizade
Keyword(s):  
Electrical Resistance ◽  
Hydrocarbon Fuel ◽  
Electrical Insulation ◽  
Polymer Swelling ◽  
Graphite Composite ◽  
Conductive Composite ◽  
Graphite Particles ◽  
Three Samples ◽  
Rubber Composite ◽  
Conductive Fillers

Hydrocarbon liquids such as gasoline, diesel, jet fuel, and solvents are hazardous materials derived from petroleum. These materials can diffuse the rubber network structures and cause swelling in these polymers. Rubber materials containing conductive fillers exhibit a high conductivity at the higher percolation threshold. As direct effect of solvent on the polymer, swelling in the rubber composite alters the structure of the filler network and subsequently the composite properties change significantly. This Process can be considered as a signal for solvent or hydrocarbon fuel detector system and used conductive rubber composite as a flexible sensor. In this study, the nitrile/graphite composite samples were prepared containing different amounts of graphite particles. These samples have the ability to measure electrical resistance. The electrical resistance of rubber/graphite samples decreases with increasing content of graphite particles. The increase in the electrical resistance of the specimens was measured by using conductive composite swelling in toluene solvent and it was observed that all specimens eventually became electrical insulation. Samples with concentrations of 60, 70, and 80 phr are conductive after recovery and solvent removal. While their conductivity is less than that of the virgin samples. The incremental trend of electrical resistance against the conductive composite swelling was measured in toluene solvent and it was observed that all samples were eventually converted to electrical insulation. But there is little difference between the third swelling process and the second one. This phenomenon has occurred for all three samples, which reveals a good similarity with the Mullins effect.

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