Evaluation of strength degradation behavior and fatigue life prediction of plain-woven carbon-fiber-reinforced plastic laminates immersed in seawater

Shuhei Koshima, Shunsuke Yoneda, Norihiro Kajii, Atsushi Hosoi, Hiroyuki Kawada

Research output: Contribution to journalArticle

Abstract

The effect of long-term seawater immersion on the mechanical properties and fatigue life of plain-woven carbon-fiber-reinforced plastic (CFRP) laminates was investigated. Under tension loading, the static strength and low-cycle fatigue strength of the CRFP laminates greatly decreased owing to the rapid growth of interface debonding and delamination. However, under compression loading, the fatigue strength of the CRFP laminates dramatically decreased in the entire fatigue region as fiber buckling was likely to occur. These findings indicate that the fatigue strength degradation differed depending on the stress ratio and deterioration of the fiber/matrix interface strength. In addition, the fatigue life after seawater immersion was predicted using Epaarachchi and Clausen's model and constant life diagrams. These models were shown to accurately reflect the decrease in fatigue strength resulting from seawater immersion and can thus be used for fatigue life prediction of CFRPs after long-term immersion in seawater.

Original languageEnglish
Article number105645
JournalComposites Part A: Applied Science and Manufacturing
Volume127
DOIs
Publication statusPublished - 2019 Dec

Fingerprint

Plastic laminates
Carbon fiber reinforced plastics
Seawater
Fatigue of materials
Degradation
Laminates
Fibers
Debonding
Delamination
Buckling
Deterioration
Mechanical properties
Fatigue strength
carbon fiber reinforced plastic

Keywords

  • A. Polymer-matrix composites
  • B. Environmental degradation
  • B. Fatigue
  • C. Damage mechanics

ASJC Scopus subject areas

  • Ceramics and Composites
  • Mechanics of Materials

Cite this

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title = "Evaluation of strength degradation behavior and fatigue life prediction of plain-woven carbon-fiber-reinforced plastic laminates immersed in seawater",
abstract = "The effect of long-term seawater immersion on the mechanical properties and fatigue life of plain-woven carbon-fiber-reinforced plastic (CFRP) laminates was investigated. Under tension loading, the static strength and low-cycle fatigue strength of the CRFP laminates greatly decreased owing to the rapid growth of interface debonding and delamination. However, under compression loading, the fatigue strength of the CRFP laminates dramatically decreased in the entire fatigue region as fiber buckling was likely to occur. These findings indicate that the fatigue strength degradation differed depending on the stress ratio and deterioration of the fiber/matrix interface strength. In addition, the fatigue life after seawater immersion was predicted using Epaarachchi and Clausen's model and constant life diagrams. These models were shown to accurately reflect the decrease in fatigue strength resulting from seawater immersion and can thus be used for fatigue life prediction of CFRPs after long-term immersion in seawater.",
keywords = "A. Polymer-matrix composites, B. Environmental degradation, B. Fatigue, C. Damage mechanics",
author = "Shuhei Koshima and Shunsuke Yoneda and Norihiro Kajii and Atsushi Hosoi and Hiroyuki Kawada",
year = "2019",
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volume = "127",
journal = "Composites - Part A: Applied Science and Manufacturing",
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AU - Koshima, Shuhei

AU - Yoneda, Shunsuke

AU - Kajii, Norihiro

AU - Hosoi, Atsushi

AU - Kawada, Hiroyuki

PY - 2019/12

Y1 - 2019/12

N2 - The effect of long-term seawater immersion on the mechanical properties and fatigue life of plain-woven carbon-fiber-reinforced plastic (CFRP) laminates was investigated. Under tension loading, the static strength and low-cycle fatigue strength of the CRFP laminates greatly decreased owing to the rapid growth of interface debonding and delamination. However, under compression loading, the fatigue strength of the CRFP laminates dramatically decreased in the entire fatigue region as fiber buckling was likely to occur. These findings indicate that the fatigue strength degradation differed depending on the stress ratio and deterioration of the fiber/matrix interface strength. In addition, the fatigue life after seawater immersion was predicted using Epaarachchi and Clausen's model and constant life diagrams. These models were shown to accurately reflect the decrease in fatigue strength resulting from seawater immersion and can thus be used for fatigue life prediction of CFRPs after long-term immersion in seawater.

AB - The effect of long-term seawater immersion on the mechanical properties and fatigue life of plain-woven carbon-fiber-reinforced plastic (CFRP) laminates was investigated. Under tension loading, the static strength and low-cycle fatigue strength of the CRFP laminates greatly decreased owing to the rapid growth of interface debonding and delamination. However, under compression loading, the fatigue strength of the CRFP laminates dramatically decreased in the entire fatigue region as fiber buckling was likely to occur. These findings indicate that the fatigue strength degradation differed depending on the stress ratio and deterioration of the fiber/matrix interface strength. In addition, the fatigue life after seawater immersion was predicted using Epaarachchi and Clausen's model and constant life diagrams. These models were shown to accurately reflect the decrease in fatigue strength resulting from seawater immersion and can thus be used for fatigue life prediction of CFRPs after long-term immersion in seawater.

KW - A. Polymer-matrix composites

KW - B. Environmental degradation

KW - B. Fatigue

KW - C. Damage mechanics

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