Multi-scale evaluation of permeability considering micro-scale resin impregnation behavior controlled by capillary number

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K05038
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 26030:Composite materials and interfaces-related
• Research Institution: Kanazawa Institute of Technology
• Principal Investigator: Saito Hiroshi 金沢工業大学, 工学部, 教授 (70367457)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 浸透性 / 繊維強化プラスチック / 毛管数 / マルチスケール評価

Outline of Final Research Achievements

In order to derive the conditions under which the capillary numbers become identical for various resins impregnating the same fabric, the parameters of capillary number were divided into a temperature-dependent term and a pressure-dependent term. The temperature conditions to be temperature-dependent term identical were determined among various resins. Permeabilities were evaluated under these temperature conditions to determine the pressure conditions to be resin flow rate identical for various resins. As a result, we succeeded changing the capillary number from 0.006 to 0.017 for each resin. On the other hand, the permeability remained almost the same regardless of the capillary number. Therefore, it was concluded that there was no correlation between the permeability and the capillary number within the range of the capillary number varied in this study.

Free Research Field

複合材料工学

Academic Significance and Societal Importance of the Research Achievements

軽量化が要求される自動車等の移動体において、繊維強化プラスチックは大いに注目を集めており、それに伴って成形技術に関する研究も進められている。中でも成形時の気泡形成は従来より大きな課題として、その形成メカニズムに関する実験的、理論的考察がおこなわれてきた。毛管数に関しては、これまでにも気泡形成メカニズムを説明する上で取り上げられてきたが、毛管数であらわされるミクロスケールの樹脂浸透挙動とマクロスケールで評価される浸透性の相関性を、マルチスケールの観点から実験的に評価、検証した例は申請者の知る限りなく、ここに本研究成果の学術的および社会的意義があると考える。