Research on Flexural Test Methods for Advanced Composite Materials

先进复合材料弯曲试验方法研究

• 批准号: 02650048
• 负责人: UEMURA Masuji
• 金额: $ 1.28万
• 依托单位: Faculty of Industrial Technology, Nihon University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1991
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02650048/
• 关键词: Advanced composites; CFRP; Flexural test methods; 3-point bending; 4-point bending; Pure bending; stress concentration; Size effect; 一方向強化材

1) In Japan, the 3-point or 4-point bending was prescribed as JIS (Japan Industrial Standard) for the flexural testing methods. However, if it is applied to the advanced composites with extreme anisotropy such as unidirectional carbon-fiber-reinforced plastics (CFRP), the failures take place beneath the loading noses due to the local fractures, without due to the flexural fractures.2) The flexural strengths obtained in short and thick specimens under 3-point bending are much lower than those in long and thin specimens under 4-point bending because of high stress concentration.3) Accordingly, the two kinds of pure bending pigs were developed in order to avoid the stress concentration in the 3- and 4-point bending methods. By using them, the real flexural fractures were obtained the flexural strengths were more than 30%-50% higher than those obtained in the 3- and 4-point bending methods. The pure bending method should be used in testing the advanced composite materials.

1)在日本，3点或4点弯曲被规定为JIS（日本工业标准）的弯曲试验方法。然而，如果将其应用于具有极端各向异性的高级复合材料，如单向碳纤维增强塑料（CFRP），则由于局部断裂而发生在加载头下方，而不是由于弯曲断裂。2)由于应力集中程度高，3点弯曲作用下短、厚试件的抗弯强度远低于4点弯曲作用下长、薄试件的抗弯强度。3)为避免三点弯曲法和四点弯曲法的应力集中，开发了两种纯弯曲猪。采用该方法可获得真实弯曲骨折，其弯曲强度比3点弯曲法和4点弯曲法的弯曲强度提高30% ~ 50%以上。高级复合材料的测试应采用纯弯曲法。

项目成果

植村 益次: "日仏複合材料セミナ-(第10回筑波シンポジウム)に参加して" 日本複合材料学会誌. 17. 125-128 (1991)

Masuji Uemura：“参加日本-法国复合材料研讨会（第10届筑波研讨会）”日本复合材料学会杂志17. 125-128（1991）。

Y. YOSHIDA, T. OGASA, M. UEMURA: "Local Stress Distribution in the Vicinity of Loading Points in Flexural Test of Orthotropic Beams" Trans. of the ASME (Jour. of Energy Resources Technology). 13. 230-234 (1991)

Y. YOSHIDA、T. OGASA、M. UEMURA：“正交各向异性梁弯曲试验中加载点附近的局部应力分布” Trans。

植村 益次: "複合材料(FRP)による構造設計の考え方(1)(2)" 機械の研究. 43. 1189-1194,1283-1288 (1991)

Masuji Uemura：“关于使用复合材料（FRP）的结构设计的思考（1）（2）”机械研究43。1189-1194，1283-1288（1991）

Masuji UEMURA: "On Japan-France Seminar on Composite Materials. (10th. Tsukuba Symposium)" Jour. of the Japan Society for Composite Materials. 17. 125-128 (1991)

Masuji UEMURA：“日本-法国复合材料研讨会。（第十届筑波研讨会）”

植村 益次: "日仏複合材料セミナ-(第1回筑波シンポジウム)に参加して" 日本複合材料学会誌. 17. 125-128 (1991)

Masuji Uemura：“参加日本-法国复合材料研讨会（第一届筑波研讨会）”日本复合材料学会杂志17. 125-128（1991）。