Tensile fracture and failure behavior of thermoplastic starch with unidirectional and cross-ply flax fiber reinforcements

Gábor Romhány, J. Karger-Kocsis, T. Czigány

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92 Citations (Scopus)

Abstract

Thermoplastic starch (MaterBi®) based composites containing flax fibers in unidirectional and crossed-ply arrangements were produced by hot pressing using the film stacking method. The flax content was varied in three steps, viz. 20, 40 and 60 wt.-%. Static tensile mechanical properties (stiffness and strength) of the composites were determined on dumbbell specimens. During their loading the acoustic emission (AE) was recorded. Burst type AE signal characteristics (amplitude, width) were traced to the failure mechanisms and supported by fractographic inspection. The mechanical response and failure mode of the composites strongly depended on the flax content and the flax fiber lay-up. It was established that the tensile strength increases until 40 wt.-% flax fiber content but stays almost constant above this value. In the case of 40 wt.-% unidirectional fiber reinforcement, the tensile strength of the composite was 3 times greater than that of the pure starch matrix. The flax fiber reinforcement increased the tensile modulus of the pure starch by several orders of amplitude.

Original languageEnglish
Pages (from-to)699-707
Number of pages9
JournalMacromolecular Materials and Engineering
Volume288
Issue number9
DOIs
Publication statusPublished - Sep 10 2003

Fingerprint

Flax
Fiber reinforced materials
Starch
Thermoplastics
Composite materials
Acoustic emissions
Fibers
Tensile strength
Hot pressing
Failure modes
Elastic moduli
Inspection
Stiffness
Mechanical properties

Keywords

  • Acoustic emission
  • Biocomposites
  • Failure
  • Flax fiber
  • Thermoplastic starch

ASJC Scopus subject areas

  • Materials Science(all)
  • Polymers and Plastics
  • Materials Chemistry

Cite this

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abstract = "Thermoplastic starch (MaterBi{\circledR}) based composites containing flax fibers in unidirectional and crossed-ply arrangements were produced by hot pressing using the film stacking method. The flax content was varied in three steps, viz. 20, 40 and 60 wt.-{\%}. Static tensile mechanical properties (stiffness and strength) of the composites were determined on dumbbell specimens. During their loading the acoustic emission (AE) was recorded. Burst type AE signal characteristics (amplitude, width) were traced to the failure mechanisms and supported by fractographic inspection. The mechanical response and failure mode of the composites strongly depended on the flax content and the flax fiber lay-up. It was established that the tensile strength increases until 40 wt.-{\%} flax fiber content but stays almost constant above this value. In the case of 40 wt.-{\%} unidirectional fiber reinforcement, the tensile strength of the composite was 3 times greater than that of the pure starch matrix. The flax fiber reinforcement increased the tensile modulus of the pure starch by several orders of amplitude.",
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AU - Romhány, Gábor

AU - Karger-Kocsis, J.

AU - Czigány, T.

PY - 2003/9/10

Y1 - 2003/9/10

N2 - Thermoplastic starch (MaterBi®) based composites containing flax fibers in unidirectional and crossed-ply arrangements were produced by hot pressing using the film stacking method. The flax content was varied in three steps, viz. 20, 40 and 60 wt.-%. Static tensile mechanical properties (stiffness and strength) of the composites were determined on dumbbell specimens. During their loading the acoustic emission (AE) was recorded. Burst type AE signal characteristics (amplitude, width) were traced to the failure mechanisms and supported by fractographic inspection. The mechanical response and failure mode of the composites strongly depended on the flax content and the flax fiber lay-up. It was established that the tensile strength increases until 40 wt.-% flax fiber content but stays almost constant above this value. In the case of 40 wt.-% unidirectional fiber reinforcement, the tensile strength of the composite was 3 times greater than that of the pure starch matrix. The flax fiber reinforcement increased the tensile modulus of the pure starch by several orders of amplitude.

AB - Thermoplastic starch (MaterBi®) based composites containing flax fibers in unidirectional and crossed-ply arrangements were produced by hot pressing using the film stacking method. The flax content was varied in three steps, viz. 20, 40 and 60 wt.-%. Static tensile mechanical properties (stiffness and strength) of the composites were determined on dumbbell specimens. During their loading the acoustic emission (AE) was recorded. Burst type AE signal characteristics (amplitude, width) were traced to the failure mechanisms and supported by fractographic inspection. The mechanical response and failure mode of the composites strongly depended on the flax content and the flax fiber lay-up. It was established that the tensile strength increases until 40 wt.-% flax fiber content but stays almost constant above this value. In the case of 40 wt.-% unidirectional fiber reinforcement, the tensile strength of the composite was 3 times greater than that of the pure starch matrix. The flax fiber reinforcement increased the tensile modulus of the pure starch by several orders of amplitude.

KW - Acoustic emission

KW - Biocomposites

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