Mechanical Properties of Braided Carbon/PU Composite

• Main Authors: LIU, HSUAN-TING, 劉軒廷
• Other Authors: HWANG, SHUN-FA
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/at5438

碩士 === 國立雲林科技大學 === 機械工程系 === 104 === The application of composite materials has prevailed in aviation industry and bicycle industry. The purpose of composite materials is to reduce the weight of the products under due strength and be able to take bigger load. This text is mainly aimed at exploring the influence of braid angle on elastic constant and strength. The specimen of the experiment is created by VARTM, and the matrix is PU. The method is creating uni-directional specimen and different braid angles specimen separately and exploring their elastic constant through the tension test. The research is aimed at exploring braided composite. It is mainly separated into two parts. In the first part, establish the method of the elastic constant of different braid angles by classical laminate theory and compare with finite element analysis through the experiment. In the second part, in finite element analysis, explore the strength of different braid angles predicted by elastic constant of uni-directional, and explore the result of the braided composites. The result reveals that in the first part, in simulation analysis, the result of Young's modulus is close to the result of classical laminate theory. However, the error between it and the result of the experiment is bigger. The maximum error is around -7%. The trend of it conforms to finite element analysis. In the second part, compare the experimental strength to the strength of different braid angles predicted from the elastic constant of uni-directional, and the errors are less than ten percent. In the research, at first, use the stress-strain transformation to search for the strength of braided composite and compare it to the result from the uni-directional result. They are close to each other. Then, after confirming finite element model and its method, search for the strength of the braided composite. Therefore, through it, we can get a set of method to predict the strength of the compsoite with different braid angles.