The Connecting Performance Of 2-Dceramic Matrix Composite Joint Reinforced By Z-pins

In this paper the single lap joints, which are made from 2-D ceramic matrix composite, reinforced by Z-pins are studied in experiment. The results indicate the single lap joints' broken methods rest with the connecting distance of single lap joints, there are two types: (1) when the distance equals 15mm, the single lap joint come unglued; (2) when the distance is more 15mm, the board composing single lap joint is snapped. The relationship between displacements and load appears stabilization wave area, when the distance is 15mm; the area indicates that Z-pins can restrain flaw extending. When the distance exceeds 15mm, the relationship between broken load and distance is linear. Using FEA method to analyze the single lap joint, the result indicates the single lap joint exists stress distribution in Z-pins and two ends of the joint. Modeling strain energy release rate of Z-pins reinforced ceramics matrix composite single lap joints at crack tips, especially the difference of Z-pins; diameter and space between brings the difference of strain energy release rate at crack tips. The result shows Z-pins can restrain the crack's growth .Z-pins' diameter influences more intensively strain energy release rate at crack tips. Z-pins' space between influences the crack tips' strain energy release rate in a certain extent, when space between is enough close, strain energy release rate at crack tips is almost constant. Besides, analyzing the single lap joint that the distance is 15mm in FEA, the result indicates increasing Z-pins' diameter or subtracting space its between can restrain flaw extending; Simultaneity, the relationship between broken load and distance is cubical.