Fabrication of unidirectional commingled-yarn-based carbon fiber/polyamide 6 composite plates and their bend fracture performances

Title & Authors
Fabrication of unidirectional commingled-yarn-based carbon fiber/polyamide 6 composite plates and their bend fracture performances
Choi, Nak-Sam;

Abstract
Unidirectional commingled-yarn-based carbon fiber(CF)/polyamide(PA) 6 composite was fabricated under molding pressures of 0.4, 0.6 and 1.0 MPa to study its flexural deformation and fracture behavior. Fiber/matrix interfacial bonding area became larger with an increase of molding pressure from 0.4 to 0.6 MPa. For molding pressures .geq. 0.6 MPa, good flexural performance of similar magnitudes was attained. For the fracture test, four kinds of notch direction were adopted : edgewise notches parallel (L) and transverse (T) to the major direction of fiber bundles, and flatwise notches parallel(ZL) and perpendicular(ZT) to this direction. Nominal bend strength for L and ZL specimens exhibited high sensitivity to notching. ZL specimens revealed the lowest values of the critical stress intensity factor $\small{K_c}$ which was slightly superior to those of unfilled PA6 matrix. Enlargement of the compression area for T specimens was analyzed by means of the rigidity reduction resulting from the fracture occurrence.
Keywords
Commingled-Yarn-Based-Composite;Molding Pressure;Interfacial Bonding;Bending Test;Flexural Strength;Fracture Mechanisms;Critical Stress Intensity Factor;Critical Strain Energy Release Rate;
Language
Korean
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