Evaluation of notch stress intensity factors in composite and piezoelectric materials

• Main Authors: Bo-Jang Jhao, 趙伯彰
• Other Authors: Shen-Haw Ju
• Format: Others
• Language: en_US
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/25498627145387739674

碩士 === 國立成功大學 === 土木工程學系碩博士班 === 97 === This study developed the theoretical formulations based on the Stroh’s complex function approach to evaluate the displacement and stress fields. The least-squares formulation and the H-integral were used to obtain the notch SIFs of a shape V-notch anisotropic material. The displacements from image-correlation experiments were then introduced into the least-squares formulation to solve the notch SIFs and compared with the SIFs calculated from the H-integral and finite element method. The single composite material and the bi-material problems are considered with the same methods. The effects of environmental vibrations and man-made vibrations for the image correlation system were also investigated. The results show that the vibrations increase the standard deviations of the SIFs from the experiment. The preliminary study in piezoelectric materials was also performed, and the two-dimensional finite element model has been generated.