Properties of Composite Laminates Reinforced with E-Glass Multiaxial Non-Crimp Fabrics

Abstract

Multiaxial knitted non-crimp fabrics (NCFs) are a relatively new form of reinforcement for composites. A study focusing on the mechanical properties of such composites has been carried out and the results are reported in this paper. E-glass/epoxy composites were manufactured by the Resin Transfer Molding (RIM) process using different NCFs. The composites were tested in uniaxial tension, three point bending, compression and short beam shear. Results on elastic modulus and strength were obtained and compared among the different testing conditions. Failure of the NCF composites was examined visually after the final failure of the specimens. The test results on tension and flexural moduli were compared with Classical Lamination Theory (CLT) predictions, and good agreements were observed. The test results and inspections of failed specimens revealed that the NCF composite laminates behaved like their tape laminate counterparts. Consequently, low cost high perfomance composite laminates may be achieved through the use of NCF fabrics as reinforcing materials.

Keywords

non-crimp fabrics multaxial knitted fabrics mechanical properties testing

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References

1. Hosting, K. , B. Wulhorts , G. Franzke and P. Offermann . 1993. "New Types of Textile Fabrics for Fiber Composites," SAMPE Journal, 29:1.

2. Jones, R. M. 1975. Mechanics of Composite Materials. New York: McGraw-Hill Book Co.

3. Chamis, C. C. 1983. "NASA Technical Memo 83320: presented at the 38th Annual Conference of the Society of Plastics Industry, Houston, TX.

4. Shahid, I. and F. K. Chang . 1995. "An Accumulative Damage Model for Tensile and Shear Failures of Laminated Composite Plates," Journal of Composite Materials. To appear in January Issue.

5. Harrison, R. P. and M. G. Bader . 1983. "Damage Development in CFRP Laminates Under Monotonic and Cyclic Stressing," Fiber Sci. Technol., 18:163.

6. Bullock, R. E. 1974. "Strength Ratios of Composite Materials in Flexure and in Tension," Journal of Composite Materials, 8:200.

7. Whitney, J. M. and M. Knight . 1980. "The Relationship Between Tensile Strength and Flexure Strength in Fiber-Reinforced Composites," Experimental Mechanics, 20:211.

8. Stinchcomb, W. W. , E. G. Henneke and H. L. Price . 1977. "Use of the Short-Beam Shear Test for Quality Control of Graphite-Polyimide Laminates," Reproducibility and Accuracy of Mechanical Tests, ASTM STP 96, p. 626

9. Whitney, J. M. and C. E. Browning . 1985. "On Short-Beam Shear Tests for Composite Materials," Experimental Mechanics, September, 294-300.

10.

10. Fortson, B. H. and E. A. Armanios . 1991. "Damage Processes in a Quasi-Isotropic Composite Short Beam Under Three-Point Loading," Journal of Composite and Technology & Research, JCTRER, 13(4):249-256.