Prediction for stiffness reduction and progressive damage of composite laminate including ply cracks

Sota Onodera, Tomonaga Okabe

研究成果: Chapter in Book/Report/Conference proceedingConference contribution

抄録

Fiber-reinforced laminates have a specific fracture mode such as ply cracking (cracking in a direction parallel to the fiber), delamination, and breakage of the fiber. Of these fracture modes, ply cracking occurs in the earliest stage, and it can result in significant degradation in material stiffness. Furthermore, the initiation of ply cracking causes stress redistribution, resulting in more severe forms of damage such as delamination and breakage of the fiber due to the stress concentration at the crack tip. Therefore, it is important to clarify the mechanical behavior of laminates including ply cracking. This study focuses on the stiffness reduction of laminate due to ply cracking and the ply cracking progression in a ply. First, the continuum damage mechanics (CDM) based model for predicting the stiffness reduction of composite laminates is established. The effective compliance of laminate based on CDM and the classical laminate plate theory (CLPT) was used to formulate the thermo-elastic properties of laminate of arbitrary lay-up configurations as a function of ply crack density. The damage variable d2 is formulated analytically by three-dimensional local stress field (3-D LSF) model in a ply including ply cracking subjected to tensile loading. Next, ply cracking progression in laminates including 90° plies was investigated. The energy release rate associated with ply cracking is calculated using the 3-D LSF model, and then ply cracking progression in 90° plies of CFRP cross-ply laminates based on both strength and energy criteria is predicted using the Monte Carlo method. The models proposed in this study can predict the experiment results and finite element analysis results.

本文言語英語
ホスト出版物のタイトル33rd Technical Conference of the American Society for Composites 2018
出版社DEStech Publications Inc.
ページ626-640
ページ数15
ISBN(電子版)9781510872073
出版ステータス出版済み - 2018
外部発表はい
イベント33rd Technical Conference of the American Society for Composites 2018 - Seattle, 米国
継続期間: 9 24 20189 27 2018

出版物シリーズ

名前33rd Technical Conference of the American Society for Composites 2018
1

会議

会議33rd Technical Conference of the American Society for Composites 2018
国/地域米国
CitySeattle
Period9/24/189/27/18

All Science Journal Classification (ASJC) codes

  • 材料力学
  • 表面、皮膜および薄膜
  • 金属および合金

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