Mechanism clarification for high reliability green composites

• Project/Area Number: 25420019
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Materials/Mechanics of materials
• Research Institution: Yamaguchi University
• Principal Investigator: Koichi Goda 山口大学, 理工学研究科, 教授 (10153743)
• Research Collaborator: KIM Hyun-Bum 山口大学, 大学院理工学研究科, 博士後期課程
• Project Period (FY): 2013-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000); Fiscal Year 2015: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2014: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2013: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
• Keywords: グリーンコンポジット / 天然繊維 / 撚糸 / ポリプロピレン / マレイン酸変性樹脂 / PVA / 押出し成形 / 強度

Outline of Final Research Achievements

The purpose of this study is to realize green composites with high reliability and mechanical properties. First, reliability mechanism in elastic modulus was studied experimentally and theoretically, using a green composite strand reinforced by natural fiber spun yarn. Results based on first-order second-moment method (FOSM), one of the representative reliability engineering models, showed that the both factors, (i) fiber orientation angle in a spun yarn and (ii) the fiber volume fraction, were closely related with the statistical variation of elastic modulus. Next, a green composite strand producing equipment which can control fiber orientation angles in a spun yarn, was newly developed. Results show, although elastic modulus of a spun yarn without resin is usually reduced with increase in fiber orientation angle, that of the resultant composite strand was enhanced conversely through resin impregnation and stronger entanglement between fibers.

Research Products

• [Journal Article] Production of a single ramie spun yarn/PP composite tape and reliability analysis in elastic modulus (2016)
  • Author(s): Hyun-Bum Kim, Koichi Goda
  • Journal Title: 成形加工 Volume: 28
  • NAID: 130006647036
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] TENSILE PROPERTIES AND RELIABILITY OF A RAMIE SPUN YARN/PP COMPOSITE STRAND (2015)
  • Author(s): Hyun-Bum Kim, Koichi Goda, and Kenji Aoki
  • Journal Title: The Japan Society of Polymer Processing Volume: 27
  • NAID: 130006647065
  • Peer Reviewed
• [Presentation] Reliability of elastic modulus on ramie yarn/PP composite materialｓ (2015)
  • Author(s): Hyun-Bum Kim, Koichi Goda
  • Organizer: 第8回 構造物の安全性・信頼性に関する国内シンポジウム（JCOSSAR2015)
  • Place of Presentation: 日本学術会議（東京都．港区）
  • Year and Date: 2015-10-14
• [Presentation] Production of a ramie spun yarn/PP composite strand and analysis of elastic modulus (2014)
  • Author(s): Hyun-Bum Kim, Koichi Goda, Kenji Aoki
  • Organizer: 成形加工シンボジア14
  • Place of Presentation: 新潟市、朱鷺メッセ
  • Year and Date: 2014-11-14
• [Presentation] STRENGTH AND RELIABILITY OF A RAMIE SPUN YARN/PP COMPOSITE STRAND BY M-PARI PROCESS (2013)
  • Author(s): Hyun-bum KIM, Shuichiro KIMURA, Koichi GODA, Kenji AOKI
  • Organizer: Composites Week
  • Place of Presentation: カトリック大学、ルーベン（ベルギー）