Advertisement

Journal of Materials Science

, Volume 44, Issue 13, pp 3445–3456 | Cite as

Effect of fibre concentration and strain rate on mechanical properties of single-gated and double-gated injection-moulded short glass fibre-reinforced polypropylene copolymer composites

  • P. Onishi
  • S. HashemiEmail author
Article

Abstract

The effect of fibre concentration, strain rate and weldline on tensile strength, tensile modulus and fracture toughness of injection-moulded polypropylene copolymer (PPC) reinforced with 10, 20, 30 and 40% by weight short glass fibre was studied. It was found that tensile modulus of single- and double-gated mouldings increased with increasing volume fraction of fibres, ϕf, according to additive rule-of-mixtures, and increased linearly with natural logarithm of strain rate \( ( {\text{ln}}\;\dot{e} ) \). The presence of weldlines in double-gated mouldings led to reduction in tensile modulus which for composite containing 40% by weight short fibres was as much as 30%. A linear dependence was obtained between fibre efficiency parameter for composite modulus and \( {\text{ln}}\;\dot{e} \) for both single- and double-gated moulding. Tensile strength of single-gated mouldings, σc, increased with increasing ϕf in a nonlinear manner. However, for ϕf in the range 0–12% a simple additive rule-of-mixtures adequately described the variation of σc with ϕf. A linear dependence was obtained between fibre efficiency parameter for tensile strength and \( {\text{ln}}\;\dot{e}. \) The presence of weldlines in double-gated mouldings reduced tensile strength by as much as 70%. Tensile strength of both single- and double-gated mouldings increased linearly with \( {\text{ln}}\;\dot{e}. \) Fracture toughness of single-gated mouldings increased linearly with increasing ϕf. The presence of weldlines in double-gated mouldings reduced fracture toughness by as much as 60% for composite containing 40% by weight short glass fibres.

Keywords

Tensile Strength Fracture Toughness Fibre Length Linear Elastic Fracture Mechanic Tensile Modulus 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

References

  1. 1.
    Nabi ZU, Hashemi S (1998) J Mater Sci 33:2985. doi: https://doi.org/10.1023/A:1004362915713 CrossRefGoogle Scholar
  2. 2.
    Hashemi S (2002) J Plast Rubber Compos 31:1CrossRefGoogle Scholar
  3. 3.
    Hashemi S (2007) eXPRESS Polym Lett 1:688CrossRefGoogle Scholar
  4. 4.
    Wilberforce S, Hashemi S (2009) J Mater Sci, to be publishedGoogle Scholar
  5. 5.
    Hashemi S, Lepessova Y (2007) J Mater Sci 42:2652. doi: https://doi.org/10.1007/s10853-006-1358-z CrossRefGoogle Scholar
  6. 6.
    Khamsehnezhad A, Hashemi S (2008) J Mater Sci 43:6344. doi: https://doi.org/10.1007/s10853-008-2918-1 CrossRefGoogle Scholar
  7. 7.
    Necar M, Irfan-ul-Haq M, Khan Z (2003) J Mater Process Technol 142:247CrossRefGoogle Scholar
  8. 8.
    Fu SY, Lauke B, Mader E, Yue CY, Hu X (2000) Compos A 31:1117CrossRefGoogle Scholar
  9. 9.
    Fisa B (1985) Polym Compos 6:232CrossRefGoogle Scholar
  10. 10.
    Thomason JL (2002) Compos Sci Technol 62:1455CrossRefGoogle Scholar
  11. 11.
    Thomason JL (2001) Compos Sci Technol 61:2007CrossRefGoogle Scholar
  12. 12.
    Mouhmid B, Imad A, Benseddiq N, Benmedakhene, Maazouz A (2006) Polym Test 25:544CrossRefGoogle Scholar
  13. 13.
    Cox HL (1952) Brit J Appl Phys 3:72CrossRefGoogle Scholar
  14. 14.
    Krenchel H (1964) Fibre reinforcement. Akademisk Forlag, CopenhagenGoogle Scholar

Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  1. 1.London Metropolitan Polymer Centre, London Metropolitan UniversityLondonUK

Personalised recommendations