Development of experimental evaluation method for nonlinear mechanical modeling considering damage in fiber reinforced composites

• Project/Area Number: 18K03848
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 18010:Mechanics of materials and materials-related
• Research Institution: Tokyo University of Science
• Principal Investigator: Ogihara Shinji 東京理科大学, 理工学部機械工学科, 教授 (70266906)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000); Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2018: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
• Keywords: 炭素繊維強化プラスチック / 粘塑性 / 応力緩和 / 非弾性力学挙動 / 積層構造 / 損傷 / ひずみ速度依存性 / 繊維強化プラスチック / 有限変形

Outline of Final Research Achievements

Experimental evaluation of monotonic tension at different strain rates, stress relaxation test with increasing strain, loading-unloading test, stress relaxation test during loading-unloading process and ratcheting behavior during loading-unloading test at constant stress range are conducted. Based on the experimental results, orthotropic viscoplasticity model with overstress is developed. The model assumes additive decomposition of total stress into equilibrium stress and overstress and constitutive laws for each stress. Hoffman elastoplastic model is used for equilibrium stress and a model which considers nonlinear dependence on strain rate is used for overstress.

Academic Significance and Societal Importance of the Research Achievements

連続繊維強化複合材料・構造の力学挙動モデル化については，微小弾性変形を仮定するものがほとんどで，塑性力学的研究は少なく，特に有限変形を考慮した粘塑性解析はほとんどなされていない．積層構造によっては，そのようなモデル化が必要であり，異方性を有する繊維強化複合材料・構造に対して，損傷を考慮した有限変形下での非線形力学モデルを構築しようとするところに本研究の学術的および社会的意義がある．

Research Products

• [Int'l Joint Research] ニューキャッスル大学(英国)
• [Journal Article] Damage behaviors in cross-ply cloth CFRP laminates cured at different temperatures (2020)
  • Author(s): M. J. Mohammad FIKRY and Shinji OGIHARA
  • Journal Title: Mechanical Engineering Journal Volume: 7 Issue: 5 Pages: 20-00383-20-00383
  • DOI: 10.1299/mej.20-00383
  • NAID: 130007926529
  • ISSN: 2187-9745
  • Peer Reviewed
• [Presentation] Variational Analysis of Laminates with Divided Regions in Longitudinal Direction (2020)
  • Author(s): M. J. Mohammad Fikry and Shinji Ogihara
  • Organizer: Joint Conference of 23rd International Conference on Composite Structures (ICCS23) & 6th International Conference on Mechanics of Composites (MECHCOMP6)
  • Int'l Joint Research
• [Presentation] Measurement of Residual Strains as a Parameter of Matrix Cracking in CFRP Laminates (2020)
  • Author(s): M. J. Mohammad Fikry, Shinji Ogihara and Vladimir Vinogradov
  • Organizer: The International Conference on Leading Edge Manufacturing/Materials & Processing (LEMP)
  • Int'l Joint Research
• [Presentation] Mechanical Properties and Damage Behavior of Angle-ply CFRP Laminates with Discontinuous Plies (2020)
  • Author(s): M. J. Mohammad Fikry, Zulkifli Nur Atikah and Shinji Ogihara
  • Organizer: International Conference on Fracture and Damage Mechanics (FDM)
  • Int'l Joint Research
• [Presentation] Evaluation of Nonlinear Mechanical Behavior in Fiber Reinforced Laminated Composites (2020)
  • Author(s): Shinji Ogihara
  • Organizer: 44th International Conference and Exhibition on Advanced Ceramics and Composites
  • Int'l Joint Research / Invited
• [Presentation] 繊維強化複合材料の非線形力学特性評価 (2019)
  • Author(s): 荻原慎二，板橋洋輔
  • Organizer: 日本機会学会2019年度年次大会
• [Presentation] 繊維強化複合材料積層板の非線形力学挙動 (2019)
  • Author(s): 荻原慎二
  • Organizer: 日本機械学会第27回機械材料・材料加工技術講演会
• [Presentation] CFRPアングルプライ積層板の粘塑性力学挙動評価 (2018)
  • Author(s): 荻原慎二
  • Organizer: 日本機械学会第26回機械材料・材料加工技術講演会（山形大学(米沢)）