Investigation on Fracture Behavior of Glass Fiber Reinforced Thermoplstic and Thermosetting Composites

Abstract:

Glass fiber reinforced thermoplastics and thermosetting composites were prepared in this study. Commercial grades of 20% glass fiber filled polypropylene, polyoxymethylene, polyamide 6 and polycarbonate were injection molded to dumbbell specimens. The specimens are referred as GF/PP, GF/POM, GF/PA and GF/PC, respectively. 55% GF reinforced novolak composites were fabricated by hand lay-up, which different curing times of 20 s, 35 s and 50 s. Mechanical properties, fracture behavior and morpgology of GF composites with and without notched were investigated. GF/PA showed the highest properties of tensile properties, notched strength and fracture toughness as compared to all of GF reinforced thermoplastics in this research. On the other hand, tensile properties and fracture toughness of GF reinforced novolak increased with increasing curing times. SEM photographs indicated ductile fractured surface near the crack edge while their brittle appeared at far of the crack in GF reinforced thermoplastics. It can be noted that notched sensitivity of GF reinforced thermoplastics was lower than GF reinforced thermosetting composites.

• Periodical: Key Engineering Materials (Volume 728)
• Pages: 235-239
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.728.235
• Online since: January 2017
• Authors: Suchalinee Mathurosemontri, Kentaro Okuno, Yoichiro Ogura, Supaphorn Thumsorn*, Hiroyuki Hamada
• Keywords: Curing, Fracture Toughness, Morphology, Notch Sensitivity, Tensile Property

References

[1] R.J. Crowson, M.J. Folkes, P.F. Bright, Rheology of Short Glass Fiber-Reinforced Thermoplastics and its Application to Injection Molding I. Fiber Motion and Viscosity Measurement, Polym Eng Sci. 20 (1980) 925-933.

DOI: 10.1002/pen.760201403

[2] A.C. Cutris, P.S. Hope, L.M. Ward, Modulus development in oriented Short-Glass-Fiber- Reinforced Polymer Composites, Polym Compos. 3 (1982) 138-145.

DOI: 10.1002/pc.750030307

[3] P.J. Hine, S. Wire, R.A. Duckett, I.M. ward, Hydrostatically extruded glass fiber reinforced polyoxymethylen. II: modeling the elastic properties, Polym Compos. 18 (1997) 635-641.

DOI: 10.1002/pc.10314

[4] R. Singh, F, Chen, F.R. Jones, Injection molding of glass fiber reinforced phenolic composites. 2: study of the injection molding process, Polym Compos. 19 (1998), 37-47.

DOI: 10.1002/pc.10073

[5] A.K. Haldar, S. Senthivelan, Notch effect on discontinuous fiber reinforced thermoplastic composites, Key Eng Mater. 47 (2011) 173-178.

DOI: 10.4028/www.scientific.net/kem.471-472.173

[6] R.A. Weiss, Mechanical properties of polypropylene reinforced with short graphite fibers, Polym Compos. 2 (1981) 95-101.

DOI: 10.1002/pc.750020303

[7] E. Elbadry, Z. Zhang, Y. Yang, H. Hamada, Fracture toughness and notch sensitivity of jute fiber mats reinforced unsaturated polyester matrix composites based on the characteristic distance, Stud Sci Technol. 2 (2013) 53-56.

[8] B.C. Ogazi-Onyemaechi, Y.W. Leong, H. Hamada, Crack propagation behavior and toughness of V-notched polyehtylene terphthalate injection moldings, J Appl Polym Sci. 116 (2010) 132-141.

DOI: 10.1002/app.31496

[9] S. Hashemi, P. Elmes, S. Sandford, Hybrid effects on mechanical properties of polyoxymethylene, Polym Eng Sci. 37 (1997) 45-58.

DOI: 10.1002/pen.11644