Abstract: In order to study the compression failure and contact friction behavior of carbon fiber composite core conductors (Orthotropic material) during the pressure connection construction, and to ensure the safe and stable operation of overhead conductors with carbon fiber composite mandrel in the power grid, ANSYS software is used in a ratio of 1∶1 established the three-dimensional finite element model of 7.5 mm carbon fiber composite core rod and strain clamp. Tsai-Wu failure criterion is used to determine the failure behavior of composite mandrel,considering the contact and friction behavior between composite mandrel, outer aluminium conductor and strain clamp connector. The nonlinear static finite element analysis of the splicing process of composite mandrel was carried out. The results show that the core is easy to be pulled out of the metal cavities if the single-mode pressure is less than 24 MPa, and the core is easy to be crushed if the pressure is greater than 28 MPa. However, the composite core is easy to stress concentration on the side of the metal fitting near the wedge clamp, resulting in pressure loss. The side pressure should be relatively small, preferably in the range of 21 MPa~23 MPa.

Key words: carbon fiber composite core conductor (ACCC), Tsai-Wu failure criteria, tension clamp, pressure welding, contact, the friction behavior