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Mechanism investigation and prediction of process-induced and long-term deformations in thermoplastic composites

Research Project

Project/Area Number 23K19085
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0301:Mechanics of materials, production engineering, design engineering, fluid engineering, thermal engineering, mechanical dynamics, robotics, aerospace engineering, marine and maritime engineering, and related fields
Research InstitutionTohoku University

Principal Investigator

RYUZONO Kazuki  東北大学, 工学研究科, 助教 (60982791)

Project Period (FY) 2023-08-31 – 2025-03-31
Project Status Completed (Fiscal Year 2024)
Budget Amount *help
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2024: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2023: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords炭素繊維強化プラスチック / 熱可塑性樹脂 / 残留応力 / 長期変形 / 異方性粘弾性 / 吸湿効果 / 幾何学的非線形 / マルチスケール解析 / 成形時残留変形 / 吸湿 / 残留変形 / クリープ変形 / 粘弾性 / 熱可塑性複合材料
Outline of Research at the Start

熱可塑性複合材料は再成形可能でサステナブルな素材である反面、熱硬化性複合材料に比べて粘弾性特性が顕在化し、長期的な寸法変化が発生する。したがって、航空機の構造部材として長期的な強度を保証するには、成形時に発生する残留応力を把握し、それを駆動力とした長期変形(クリープ変形)を予測する必要がある。そこで本研究では、成形条件と使用環境に起因する熱可塑性複合材料の残留変形と長期変形の発生機構を解明し、変形量を予測する粘弾性マルチスケール解析を開発する。

Outline of Final Research Achievements

This study investigated the mechanisms of process-induced deformation (PID) and long-term deformation (LTD) in composite laminates and developed a viscoelastic multiscale analysis for accurate prediction of these deformations. For the target material systems, PID was more pronounced in thermoplastic composites (T700G/LM-PAEK), whereas LTD was more significant in thermosetting composites (T700G/2510). Experimental and numerical results revealed that the large PID in thermoplastic composites resulted from a high coefficient of thermal expansion above the glass transition temperature, while the LTD in thermosetting composites was primarily attributed to moisture-induced degradation of stiffness. The proposed analysis, which integrates the estimation of anisotropic viscoelastic properties at the fiber/resin scale with deformation analysis at the laminate scale, accurately reproduced the experimental deformation behavior.

Academic Significance and Societal Importance of the Research Achievements

本研究では、複合材料の成形時残留変形および長期変形の発生機構に関する重要な知見を得たとともに、その知見に基づいた変形予測のための解析基盤を確立した。本研究で構築した粘弾性マルチスケール解析は、樹脂や一方向材の粘弾性特性および熱機械特性を取得するだけで、残留変形や長期変形を定量的に予測可能である。将来的に各スケールにおいて成形手法(自動積層、3Dプリンタ等)や材料の構成(繊維うねり、樹脂リッチ部、ボイド等)を反映させることで、煩雑な実験を介せずに選定した樹脂に最良な成形方法の知見を提供できる点で、本研究成果は工学的に高い意義を有する。

Report

(3 results)
  • 2024 Annual Research Report   Final Research Report ( PDF )
  • 2023 Research-status Report
  • Research Products

    (5 results)

All 2025 2024

All Journal Article (3 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 3 results,  Open Access: 1 results) Presentation (2 results)

  • [Journal Article] Mechanism investigation and comparison of long-term deformations caused by process-induced residual stresses in thermosetting CF/epoxy and thermoplastic CF/PAEK composite laminates2025

    • Author(s)
      Kazuki Ryuzono, Sera Koo, Yamato Hoshikawa, Yoshiaki Kawagoe, Tomonaga Okabe
    • Journal Title

      Composites Part A: Applied Science and Manufacturing

      Volume: in press Pages: 108963-108963

    • DOI

      10.1016/j.compositesa.2025.108963

    • Related Report
      2024 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Recent studies on multiscale modeling of carbon fiber-reinforced composites2025

    • Author(s)
      Tomonaga Okabe, Kazuki Ryuzono, Yoshiaki Kawagoe
    • Journal Title

      Advanced Composite Materials

      Volume: in press Issue: 3 Pages: 1-11

    • DOI

      10.1080/09243046.2024.2414467

    • Related Report
      2024 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Experiment-free multiscale simulation of residual deformation in non-crimp fabric composites2024

    • Author(s)
      Yuuki Kinugawa, Yoshiaki Kawagoe, Kota Oine, Kazuki Ryuzono, Yamato Hoshikawa, Tomonaga Okabe
    • Journal Title

      Advanced Composite Materials

      Volume: 33 Issue: 6 Pages: 1420-1432

    • DOI

      10.1080/09243046.2024.2348861

    • Related Report
      2024 Annual Research Report
    • Peer Reviewed
  • [Presentation] Mechanism investigation and comparison of long-term deformation in thermoplastic and thermoset composite laminates2024

    • Author(s)
      Sera Koo, Kazuki Ryuzono, Yamato Hoshikawa, Yoshiaki Kawagoe, Tomonaga Okabe
    • Organizer
      第49回複合材料シンポジウム
    • Related Report
      2024 Annual Research Report
  • [Presentation] Non-crimp fabric複合材料の残留変形マルチスケールモデリング:母材樹脂種の影響評価2024

    • Author(s)
      衣川裕貴,川越吉晃,生稲晃汰,干川大和,龍薗一樹,白須圭一,岡部朋永
    • Organizer
      第49回複合材料シンポジウム
    • Related Report
      2024 Annual Research Report

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Published: 2023-09-11   Modified: 2026-01-16  

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