Basic Study on Remaining Strength Evaluation of Advanced Composite Materials Damaged by Severe Earthquake Loading

强震荷载损伤的先进复合材料剩余强度评估基础研究

• 批准号: 08650112
• 负责人: NAKAI Yoshikazu
• 金额: $ 1.41万
• 依托单位: Kobe University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08650112/
• 关键词: Delamination; Fatigue Crack Propagation; Thermo-mechanical Fatigue; Interfacial Shear Stress; Surface Treatment; Unidirectional CFRP; Fracture Toughness; Composite Material; 先進複合材料; 強度評価; 層間はく離; 疲労強度

Constant DELTAK fatigue crack propagation tests were conducted with double cantilever baam (DCB) specimens made of two kinds of unidirectional CF/epoxy laminates. The effects of loading frequency, test temperature, and environment on the interlaminar delamination fatigue crack growth were investigated. The effect of cyclic frequency was not observed in air. The effect of test temperature was found to depend on material and environment. The interlaminar fatigue crack propagation rate was lower for higher angle between fiber and crack propagation direction. The rate also depended on specimen width.Fatigue crack propagation rate accelerated after overloading while it usually decelerates in metallic materials. Crack tip shielding by fiber bridging may diminish (or minimize) by overloading.In addition to the continuous fiber reinforced plastic mentioned above, stress relaxtion tests of short glass fiber reinforced plastics (GFRP), which is widely employed in engineering products, were conducted to evaluate interfacial shear stress. Based on the visco-elastic model and stress relaxation tests, the effects of surface treatment, strain rate, mixing pressure on tensile and fatigue properties were analyzed.

使用两种单向CF/环氧树脂层压板制成的双悬臂BAAM（DCB）标本进行了恒定的三角洲疲劳裂纹传播测试。研究了负载频率，测试温度和环境对层间分层疲劳裂纹生长的影响。在空气中未观察到循环频率的影响。发现测试温度的作用取决于材料和环境。对于纤维和裂纹传播方向之间的较高角度，层间疲劳裂纹的传播速率较低。该速率还取决于试样宽度。过载后的裂纹裂纹繁殖速率加速，而通常会减速金属材料。通过纤维桥接的裂纹尖端屏蔽可能会通过过载来减少（或最小化）。除了上面提到的连续纤维增强塑料外，短玻璃纤维增​​强塑料（GFRP）的应力相关测试（GFRP）被广泛用于工程产品，并被执行评估界面剪切应力。根据粘弹性模型和应力松弛测试，分析了表面处理，应变速率，压力对拉伸和疲劳特性的影响。

项目成果

日和 千秋, 中井 善一, 近本 忠信, 杉山 基美, 竹下 順: "複合材料の応力緩和による界面せん断応力の評価" 最新の複合材料界面研究'97(第6回複合材料界面シンポジウム要旨集). 39-42 (1997)

Chiaki Hiyori、Yoshiichi Nakai、Tadanobu Chikamoto、Motomi Sugiyama、Jun Takeshita：“通过复合材料中的应力松弛来评估界面剪切应力”最新复合材料界面研究97（第六届复合材料界面研讨会摘要）39-42）。 (1997)

日和 千秋, 中井 善一, 近本 忠信, 杉山 基美: "射出成形による複合材料の界面せん断応力に及ぼす混練圧の影響" 溶接構造シンポジウム'97. 339-346 (1997)

Chiaki Hiyori、Yoshiichi Nakai、Tadanobu Chikamoto、Motomi Sugiyama：“混合压力对注射成型复合材料界面剪切应力的影响”焊接结构研讨会 97（1997）。

日和 千秋, 中井 善一, 河村 高明: "射出成形複合材料の疲労に及ぼす繊維表面処理の影響" 日本材料学会第27回FRPシンポジウム講演論文集. (印刷中). (1998)

Chiaki Hiyori、Yoshiichi Nakai、Takaaki Kawamura：“纤维表面处理对注塑复合材料疲劳的影响”，日本材料科学学会第 27 届 FRP 研讨会论文集（1998 年）。

日和 千秋, 近本 忠信, 中井 善一, 辻 道弘: "短繊維複合材料の応力緩和に及ぼす繊維表面処理の影響" 日本材料学会第26回FRPシンポジウム講演論文集. 94-97 (1997)

Chiaki Hiyori、Tadanobu Chikamoto、Yoshiichi Nakai、Michihiro Tsuji：“纤维表面处理对短纤维复合材料应力松弛的影响”日本材料学会第 26 届 FRP 研讨会论文集（1997 年）。

Yoshikazu Nakai: "Effect of Temperature Change on Delimitation Crack Growth of unidirectional CFRP under Cyclic Loading" Fatigue under Thermal and Mechanical Loading,Mechanism,Mechanics and Modelling,Edited by J.Bressers and L.Remy. 279-284 (1996)

Yoshikazu Nakai：“循环载荷下温度变化对单向 CFRP 定界裂纹扩展的影响”热载荷和机械载荷下的疲劳、机理、力学和建模，J.Bressers 和 L.Remy 编辑。