Repeated low energy impact behaviour of self-reinforced polypropylene composites

The repeated impact behaviour of self-reinforced polypropylene composite has been characterised by tensile impact and instrumented falling weight tests. The nature of the tapes is highly anisotropic with strain hardening failure. Plastic deformation of the tape is the dominant mechanism, and the res...

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Bibliographic Details
Published in:Polymer testing 2011-04, Vol.30 (2), p.216-221
Main Authors: Aurrekoetxea, J., Sarrionandia, M., Mateos, M., Aretxabaleta, L.
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Falling
Forms of application and semi-finished materials
Impact loading
Laminates
Life prediction
Origins
Peak load
Perforation
Plastic deformation
Polymer industry, paints, wood
Polymer matrix composites
Polymer-matrix composite (PMCs)
Polypropylenes
Self-reinforced
Strain hardening
Technology of polymers
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Summary:The repeated impact behaviour of self-reinforced polypropylene composite has been characterised by tensile impact and instrumented falling weight tests. The nature of the tapes is highly anisotropic with strain hardening failure. Plastic deformation of the tape is the dominant mechanism, and the resulting penetration mode is a highly localised “star”-shaped hole. Damage and perforation thresholds are 5 J and 31.4 J respectively. Impact fatigue life exceeds 500 impact events up to 13 J, but drops sharply for 14 J. Strain-hardening is the origin of the trend of peak load increase and plastic deformation decrease with impact events. As a consequence, the amount of energy absorbed by each impact is reduced. However, when tape breaking takes place the absorbed energy increases up to perforation.
ISSN:0142-9418
1873-2348
DOI:10.1016/j.polymertesting.2010.11.017