Sisal-PP composites: Forming characteristics and stress relaxation behaviour

S. Rao, K. Jayaraman, D. Bhattacharyya

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

The forming characteristic of sisal-PP composites from relatively flat natural fibre composite sheets is discussed in this paper. The forming temperature window was determined using differential scanning calorimetry and the influence of the process and material parameters on forming characteristics of composite sheets was determined using single curvature vee-bending experiments. To develop some understanding of the viscoelastic behaviour of the composites, a model using springs and dashpots was used. The Williams, Landel and Ferry equation was used to estimate the modulus of the composites over an extended period of time, and a master curve was generated by shifting the modulus values of the specimens at different temperatures on to a reference curve by applying shift factors on the horizontal axis. It was established from the vee-bending experiments that higher temperatures and forming speed favoured the forming characteristics of the composites in terms shape conformance and surface finish. The stress relaxation data of the matrix agreed well with a spring and Maxwell element in parallel model whereas the sisal-PP composites agreed with a model of similar arrangement but with an additional Maxwell element in parallel.

Original languageBritish English
Title of host publication7th Asian-Australasian Conference on Composite Materials 2010, ACCM 2010
Pages170-173
Number of pages4
StatePublished - 2010
Event7th Asian-Australasian Conference on Composite Materials 2010, ACCM 2010 - Taipei, Taiwan, Province of China
Duration: 15 Nov 201018 Nov 2010

Publication series

Name7th Asian-Australasian Conference on Composite Materials 2010, ACCM 2010
Volume1

Conference

Conference7th Asian-Australasian Conference on Composite Materials 2010, ACCM 2010
Country/TerritoryTaiwan, Province of China
CityTaipei
Period15/11/1018/11/10

Keywords

  • Sisal-PP composites
  • Stress relaxation
  • Thermoforming
  • Time-temperature superposition

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