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Reinforced Mechanism in Polymer Composites by X-ray Diffraction

X 射线衍射增强聚合物复合材料的增强机制

基本信息

批准号：
06651055
负责人：
NISHINO Takashi
金额：
$ 1.09万
依托单位：
Kobe 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：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06651055/
关键词：
Polymer Composite X-ray diffraction Reinforcement Incorporated Fiber Interface Stress Transfer Non destructive method

项目摘要

X-ray Diffraction method was utilized to investigate the mechanism of stress transfer, stress concentration, and resulting reinforcement effect in polymer composite. Fracture mechanism based on the debonding at the interface between fiber and matrix, the effect of adhesion on the reinforcement have been also investigated. First, the stress was applied to the high-performance polyethylene fiber uni- directionally reinforced epoxy composite in the direction perpendicular to the fiber direction. The applied stress was found to be transmitted to the incorporated fiber, which could be easily detected as the diffraction peak shift of the equatorial x-ray diffraction peak. The stress transmitted to the fiber can be estimated by multiplying the crystal strain by the elastic modulus of the crystalline regions of polyethylene. By using this "X-ray Diffraction Technique" , the stress on tghe incorporated fiber, that is, the reinforced effect in polymer composite can be determined in situ and non-destructively. When the fiber was treated with chromic acid, the applied stress became well trasmitted to the fiber, which indicated that the adhesion between the fiber and matrix plays an important role for the reinforcement in the perpendicular direction. Further, the fracture mode was found to be changed by the surface treatment of the fiber. The mechanical property was found to be expressed by using the role of mixture in the direction of fiber axis, which was also clarified by utilizing the x-ray diffraction. Same kinds of experiments were also performed for carbon fiber reinforced composite, and poly (p-phenylene benzobisoxazole) reinforced composites. This technique will be also applied to investigate the effect of moisture, time, temperature.

利用X射线衍射方法研究了聚合物复合材料中的应力传递、应力集中以及由此产生的增强效果的机制。还研究了基于纤维与基体界面脱粘的断裂机制以及粘附力对增强材料的影响。首先，在垂直于纤维方向的方向上对高性能聚乙烯纤维单向增强环氧复合材料施加应力。发现施加的应力被传输到并入的光纤，这可以很容易地检测为赤道 X 射线衍射峰的衍射峰位移。传递到纤维的应力可以通过将晶体应变乘以聚乙烯结晶区域的弹性模量来估计。通过使用这种“X射线衍射技术”，可以原位非破坏性地确定掺入纤维上的应力，即聚合物复合材料中的增强效果。当纤维用铬酸处理时，施加的应力很好地传递到纤维上，这表明纤维和基体之间的粘附力对于垂直方向的增强起着重要作用。此外，发现断裂模式通过纤维的表面处理而改变。发现机械性能是通过使用混合物在纤维轴方向上的作用来表达的，这也通过利用X射线衍射来阐明。对碳纤维增强复合材料和聚对亚苯基苯并二恶唑增强复合材料也进行了相同类型的实验。该技术还将应用于研究湿度、时间、温度的影响。