Mechanical properties and damage behavior of angle-ply CFRP laminates with discontinuous plies

M. J. Mohammad Fikry, Zulkifli Nur Atikah, Shinji Ogihara

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Citation (Scopus)

Abstract

To obtain a cost-effective optimum design, prepregs are sometimes cut at some locations for significant savings in the material which results in the existence of a fiber discontinuous part in the laminates. In this study, the mechanical properties and damage behavior of angle-ply [±15]2s CFRP laminates with discontinuous plies were investigated. In the experiment, 8-plies laminates with 2, and 4-plies discontinuity were loaded in tension where the microscopic cameras and X-ray radiography were used to observe the initiation and growth of the damages. In addition, the effects of discontinuous gap length were also investigated in this study. The damages that occurred due to ply discontinuity are the micro fibermatrix debonding, crack in the resin-rich region and delamination. There were two types of delamination observed in this study which are the delamination in the neighboring plies that occurred due to high shear stress accumulation around the discontinuity part and the edge delamination that extended from the tips of the crack in the resin-rich region. For all laminates, the onset stress of the crack in the resin-rich region and delamination decreases with the number of discontinuous plies. It was also found that the shorter the discontinuous gap length, the lower the onset stress of crack and delamination. The first damage observed in all laminates was the crack in the resin-rich region following an insignificant micro fibermatrix debonding at the interface edge of the resin and fiber. The crack was then followed by the edge delamination initiated from the tips of the crack in the resin-rich region as well as delamination in the adjacent continuous plies. To explain the damage behaviors in each laminate, a FEM analysis was also conducted in this study. The FEM stress distribution clearly explained the relationship between each damage in the laminates.

Original languageEnglish
Title of host publicationFracture and Damage Mechanics
Subtitle of host publicationTheory, Simulation and Experiment
EditorsLuis Rodriguez-Tembleque, Ferri M. H. Aliabadi
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735440456
DOIs
Publication statusPublished - 26 Nov 2020
Event19th International Conference on Fracture and Damage Mechanics, FDM 2020 - Mallorca, Spain
Duration: 15 Sep 202017 Sep 2020

Publication series

NameAIP Conference Proceedings
Volume2309
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference19th International Conference on Fracture and Damage Mechanics, FDM 2020
Country/TerritorySpain
CityMallorca
Period15/09/2017/09/20

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