Low cycle fatigue behavior of symmetric angle-ply AS4/PEEK laminate

Masahiro Sakai, Kazuo Kunoo, Nobuhide Uda, Kousei Ono, Tadashi Nagayasu

Research output: Contribution to journalArticlepeer-review

Abstract

The present study includes low cycle fatigue behavior of graphite/PEEK composite materials. We conducted static tension tests to determine ultimate strength and low cycle fatigue tests using coupon specimens made from angle-ply laminates of which stacking sequence is [+30/-30]4s. Stress-strain relations are measured by an extensometer during fatigue testing for every fixed cycle in order to estimate a damage accumulation. The experimental results of stress-strain relations for every fixed cycle showed an accumulation of plastic strain, so-called ratchet type strain. The tests also indicated that fatigue failure occurred when ratchet strain reached static failure strain of about 3.9%. Moreover, we point out the difference between static failure mode and fatigue one by observing failure surface.

Original languageEnglish
Pages (from-to)125-130
Number of pages6
JournalTheoretical and Applied Mechanics
Issue number46
Publication statusPublished - Dec 1 1997

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials

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