权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Development of Fatigue Properties Evaluation System for Mesoscopic Component for Composite Materials

复合材料细观构件疲劳性能评价系统的研制

基本信息

批准号：
07555622
负责人：
HOJO Masaki
金额：
$ 0.7万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07555622/
关键词：
Composite materials Interface Fatigue strength Fiber Resin Mesoscopic component low-load capacity fatigue testing machine Fracture

项目摘要

Micro composite test was proposed in this study in order to investigate the interfacial strength of composites. This test keeps the boundary condition of fibers and matrix in real composites, and makes it possible to measure the yield and fracture on the interface. Special fatigue testing machine with very low-load capacity was developed for this microcomposite tests by using electromagnetic actuator. The results are summarized as follows :(1) Development of special low-load capacity fatigue testing system with electromagnetic actuatorA new type fatigue testing machine of the capacity of 2.5N was developed by using a special electromagnetic actuator. This testing machine can control a very small load down to 10mN.The key point for developing this actuator is the disc type spring which keeps the accuracy of the direction of the loading shaft. Fatigue tests at very low load (several tens of mN) were carried out successfully, and the development of the low-load fatigue testing system was … More almost finished.(2) Composite mesoscopic component tests with different interfacial strength under static and fatigue loadingsDifferent levels of surface treatment were carried out on PAN based carbon fiber by varying the amount of electricity through the anodic oxidation method. Acid function increased linearly with increasing the amount of electricity. Then, a model composite which is called "micro composite" was manufactured. In micro composite, the central fiber is surrounded by six fibers, and resin was impregnated among them. The boundary condition of the central fiber is similar to that of fiber in real composites. Interfacial strength was measured by pulling out the central fiber. The interfacial strength under static loading depends on the surface treatment of fiber. However, the interfacial strength under fatigue loading was not influenced by the surface treatment of fiber. The results of fatigue tests under different stress ratios showed that the effect of stress ratio was negligible when the fatigue strength is expressed by the maximum stress.(3) Comparison with macroscopic fatigue propertiesThe stress-ratio dependency of macroscopic mode II fatigue delamination was completely different from that of interfacial fatigue test. Thus, the mechanism of fatigue fracture is completely different, although the loading mode was similar. Less

为了研究复合材料的界面强度，提出了微复合试验方法。该试验保持了真实的复合材料中纤维和基体的边界条件，使界面屈服和断裂的测量成为可能。为此，研制了一台采用电磁作动器的低载疲劳试验机。（1）专用电磁作动器低载疲劳试验系统的研制采用专用电磁作动器，研制了一种新型的2.5N低载疲劳试验机。该试验机可以控制10mN以下的微小载荷。研制该驱动器的关键是保持加载轴方向精度的碟形弹簧。成功地进行了极低载荷（几十mN）下的疲劳试验，并介绍了低载荷疲劳试验系统的研制。 ...更多信息快完成了。(2)不同界面强度的复合材料细观构件静载和疲劳试验采用阳极氧化法对PAN基碳纤维进行了不同程度的表面处理。酸功能随电量的增加而线性增加。在此基础上，制备了一种称为“微复合材料”的模型复合材料。在微复合材料中，中心纤维被六根纤维包围，树脂浸渍在它们之间。中心纤维的边界条件与真实的复合材料中纤维的边界条件相似。通过拔出中心纤维来测量界面强度。静载下的界面强度取决于纤维的表面处理。而疲劳载荷下的界面强度不受纤维表面处理的影响。不同应力比下的疲劳试验结果表明，用最大应力表示疲劳强度时，应力比的影响可以忽略不计。(3)与宏观疲劳性能的比较宏观Ⅱ型疲劳脱层的应力比依赖性与界面疲劳试验完全不同。因此，疲劳断裂的机制是完全不同的，虽然加载模式是相似的。少