In this study, the mechanical properties and failure behavior of multilayer knitted carbon-fiber-reinforced polyamide 12 were investigated. In the first part, the influence of the number of stacked knit layers in composites containing 2 to 8 knit double layers were tested in the wale direction. It was found that the thickness correlated linearly with the number of knit double layers in the composite. In the second part, the angle dependence of tensile strength, Young's modulus, and failure behavior were investigated at 00, 30°, 45°, 60°, and 90° in accordance to the wale direction.
1. Rudd, C. D., M. J. Owen and V. Middleton. 1990. "Mechanical Properties of Weft Glass Fiber/Polyester Laminates,"Comp. Sci. Tech., 39:261-277.
2.
2. Chou, S. and C. J. Wu. 1992. "A Study of the Physical Properties of Epoxy Resin Composites with Knitted Glass Fiber Fabrics,"J. Reinforc. Plast. Compos., 11: 1239-1250.
3.
3. Ramakrishna, S. and D. Hull. 1994. "Tensile Behaviour of Knitted Carbon-Fiber-Fabric/Epoxy Laminates Part 1: Experimental,"Comp. Sci. Techn., 50:237-247.
4.
4. Ramakrishna, S. and D. Hull. 1994. "Tensile Behaviour of Knitted Carbon-Fiber-Fabric/Epoxy Laminates Part 2: Prediction of Tensile Properties,"Comp. Sci. Techn., 50:249-258.
5.
5. Huysmans, G., B. Gommers and I. Verpoest. 1996. "Mechanical Properties of (2D) Warp Knitted Fabric Composites: An Experimental and Numerical Investigation," in Proceedings of the 1 7th Intern. SAMPE Europe Conference, 97-108.
6.
6. Karger-Kocsis, J., Q. Yuan, J. Mayer and E. Wintermantel. 1997. "Transverse Impact Behaviour of Knitted Carbon Fiber Fabric-Reinforced Thermoplastic Composite Sheets,"J. Thermoplast. Comp. Mater., 10:163-172.
7.
7. Karger-Kocsis, J., T. Czigany and J. Mayer. 1996. "Fracture Behavior and Damage Growth in Knitted Carbon Fiber Reinforced Polyethylmethacrylate,"Plast. Rubb. Compos. Process. Appl., 26:109-114.
8.
8. Karger-Kocsis, J., T. Czigany, J. Gaal and M. Ostgathe. 1996. "Stiffness and Strength Anisotropy in the Tensile Response of Weft Knitted Fabric Reinforced PEEK and PET-Composites,"Adv. Compos. Letters, 5:71-75.
9.
9. Karger-Kocsis, J. and T. Czigany. 1997. "Interfacial Effects of the Dynamic Mechanical Behavior of Weft-Knitted Glass Fiber Fabric-Reinforced Polypropylene Composites Produced by Commingled Yams,"Adv. Compos. Letters., 4:209-218.
10.
10. Karger-Kocsis, J., E. Moos and T. Czigany. 1997. "Effects of Interphase and Fiber Content on the Mechanical Behavior of Weft Knitted Glass Fiber Reinforced Polypropylene,"Adv. Compos. Letters., 6:31-36.
11.
11. Moos, E. and J. Karger-Kocsis. 1997. "Effects of Knit Stretching and Matrix Crystallinity on the Fatigue Behavior of Knitted Fabric-Reinforced GF/PET-Composites,"Adv. Compos. Letters., 6:75-79.
12.
12. Ramakrishna, S., H. Hamada and N. K. Cuong. 1994. "Fabrication of Knitted Glass Fiber Fabric Reinforced Thermoplastic Composite Laminates,"Adv. Compos. Letters., 3:189-192.
13.
13. Ramakrishna, S., H. Hamada, R. W. Rydin and T. W. Chou. 1995. "Impact Damage Resistance of Knitted Glass Fiber Fabric Reinforced Polypropylene Composites,"Sci. Eng. Compos. Mater., 4:61-72.
14.
14. Mayer, J. 1994. Ph.D.-Thesis (ETH Zurich, Switzerland).
15.
15. Mayer, J. and E. Wintermantel. 1995. "Influence of Knit Structure and Fiber Matrix Adhesion on Failure Mechanisms of Knitted Carbon Fiber Reinforced Thermoplastics," in Proc. of 4th Japan International SAMPE Symposium, 667-672.
16.
16. Mayer, J. and E. Wintermantel. 1995. "Failure Behavior of Knitted Carbon Fiber Reinforced Thermoplastics," in 4th Europ. Conf: Advanced. Materials and Processes, Euromat 95, 515-520.
17.
17. Mayer, J., K. Ruffieux, S.-W. Ha, R. Tognini, B. Koch and E. Wintermantel. 1994. "Knitted Carbon Fiber Reinforced Biocompatible Thermoplastics: Influence of Structural Parameters on Manufacturing Techniques and Mechanical Properties,"Proc. of Int. Symp. on Adv. Mat. for Lightweight Structures, 351-358.
18.
18. Mayer, J. and E. Wintermantel. 1997. "Thermoforming Process for Knitted Fabric Reinforced Thermoplastics: New Manufacturing Techniques for Load Bearing Anisotropic Implants," Chapter 10 in Composite Sheet Forming (Ed. D. Bhattacharyya), Elsevier Science, Amsterdam, pp. 403-440.
