Cure Monitoring and Stress-Strain Sensing of Single-Carbon Fiber Composites by the Measurement of Electrical Resistance

Cure monitoring and stress-strain sensing of single-carbon fiber composites were nondestructively evaluated by the measurement of electrical resistance. The difference of electrical resistance before and after curing increased highest when gauge length of the specimen was the smallest. As curing temperature increased, the electrical behavior of steel fiber was different from that of semi-conductive carbon and SiC fibers. Residual stress built in the fiber was the highest at the fiber axis direction. Whereas residual stress built in the matrix was relatively high at the fiber circumference and radius directions. Residual stress calculated from the experiment was consistent with the results from the finite element analysis (FEA). The strain at low curing temperature was larger than that of higher temperature until the load reached maximum value. The apparent modulus of the electrodeposited composites was higher than that of the untreated composites due to the improved interfacial shear strength (IFSS). The electrical resistance was responded quantitatively with stress-strain behavior during the test. Electrical resistance measurement can be feasible nondestructive techniques to evaluate cure monitoring and stress-strain sensing in the conductive fiber composites.

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Electromechanical study of carbon fiber composites

Journal of Materials Research ◽

10.1557/jmr.1998.0420 ◽

1998 ◽

Vol 13 (11) ◽

pp. 3081-3092 ◽

Cited By ~ 24

Author(s):

Xiaojun Wang ◽

Xuli Fu ◽

D. D. L. Chung

Keyword(s):

Carbon Fiber ◽

Electrical Resistance ◽

Fiber Composites ◽

Single Fiber ◽

Fiber Direction ◽

Carbon Fiber Composites ◽

Fiber Waviness ◽

Pull Out ◽

The Matrix ◽

Fiber Matrix

Electromechanical testing involving simultaneous electrical and mechanical measurements under load was used to study the fiber-matrix interface, the fiber residual compressive stress, and the degree of marcelling (fiber waviness) in carbon fiber composites. The interface study involved single fiber pull-out testing while the fiber-matrix contact electrical resistivity was measured. The residual stress study involved measuring the electrical resistance of a single fiber embedded in the matrix while the fiber was subjected to tension through its exposed ends. The marcelling study involved measuring the electrical resistance of a composite in the through-thickness direction while tension within the elastic regime was applied in the fiber direction.

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Prediction of the electrical resistance of multilayer carbon fiber composites

Eastern-European Journal of Enterprise Technologies ◽

10.15587/1729-4061.2019.169627 ◽

2019 ◽

Vol 3 (12 (99)) ◽

pp. 46-54

Author(s):

Vadym Stavychenko ◽

Svitlana Purhina ◽

Pavlo Shestakov ◽

Maryna Shevtsova ◽

Lina Smovziuk

Keyword(s):

Carbon Fiber ◽

Electrical Resistance ◽

Fiber Composites ◽

Carbon Fiber Composites

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Early Fatigue Damage In Carbon Fiber Composites Observed By Electrical Resistance Measurement

MRS Proceedings ◽

10.1557/proc-503-75 ◽

1997 ◽

Vol 503 ◽

Author(s):

Shoukai Wang ◽

Xiaoping Shui ◽

Xuli Fu ◽

D. D. L. Chung

Keyword(s):

Carbon Fiber ◽

Fatigue Damage ◽

Electrical Resistance ◽

Carbon Matrix ◽

Fiber Composites ◽

Resistance Measurement ◽

Cement Matrix ◽

Carbon Fiber Composites ◽

Electrical Resistance Measurement ◽

Matrix Damage

ABSTRACTEarly fatigue damage during the first tenth (or less) of the fatigue life was observed in carbon fiber composites by DC electrical resistance measurement. The damage was most severe in the first loading cycle and the incremental damage in each subsequent cycle diminished cycle by cycle. For the continuous carbon fiber carbon-matrix composite, the resistance increased irreversibly during early fatigue due to matrix damage and possibly fiber fracture as well. For the short carbon fiber polymer-matrix and cement-matrix composites, the resistance decreased irreversibly during early fatigue due to matrix damage near the junction of adjacent fibers and the resulting increase in the chance that adjacent fibers touched one another.

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