Deformation conditions - Nonlinear viscoelasticity relationship for HDPE solid-state extrudate under cyclic fatigue

Seiji Higashi, Atsushi Takahara, Tisato Kajiyama

Research output: Contribution to journalArticle

Abstract

Fatigue behavior of HDPE extrudates was investigated on the basis of nonlinear dynamic viscoelastic analyses. The HDPE extrudate was prepared by a solid-state extrusion at an extrusion temperature of 353 K with an extrusion ratio of 11.1. Fatigue tests were carried out under the conditions of strain-controlled frequency of 11 Hz and environmental temperature of 303 K. Three deformation conditions were applied to fatigue tests: tension-tension, tension-compression and compression-compression deformation. Relationship between stress and strain amplitudes during fatigue process indicated that in the cases of tension-compression and compression-compression deformations, fatigue lifetime remarkably decreased with increasing dynamic strain amplitude. Nonlinear viscoelasticity during fatigue process was evaluated quantitatively by nonlinear viscoelastic parameter NVP. With increasing imposed strain amplitude, nonlinear viscoelasticity under compression-compression deformation became more remarkable because kink-bands were formed and stress distribution became inhomogeneous. Analyses of hysteresis loss during fatigue process indicated that nonlinear viscoelasticity was closely related to hysteresis loss consumed for irreversible structural change. In particular, in the case of compression-compression deformation, nonlinearity of viscoelasticity increased remarkably with hysteresis loss consumed for structural change due to kink-band formation.

Original languageEnglish
Pages (from-to)147-153
Number of pages7
JournalNihon Reoroji Gakkaishi
Volume30
Issue number3
DOIs
Publication statusPublished - Jan 1 2002

Fingerprint

viscoelasticity
Viscoelasticity
Polyethylene
High density polyethylenes
Fatigue of materials
solid state
kink bands
Compaction
fatigue tests
hysteresis
Extrusion
Hysteresis
stress distribution
ambient temperature
Control nonlinearities
nonlinearity
life (durability)
Stress concentration
temperature
Temperature

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Deformation conditions - Nonlinear viscoelasticity relationship for HDPE solid-state extrudate under cyclic fatigue. / Higashi, Seiji; Takahara, Atsushi; Kajiyama, Tisato.

In: Nihon Reoroji Gakkaishi, Vol. 30, No. 3, 01.01.2002, p. 147-153.

Research output: Contribution to journalArticle

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