| Title |
Effect of Stress Amplitude and friction Stress on Cyclic Creep Deformation |
| Authors |
엄정현(Jeong Hyeon Eom); 신동혁(Dong Hyuk Shin); 남수우(Soo Woo Nam) |
| Abstract |
The behavior of static and cyclic creep of Ni-35Cu alloy are investigated at 485 K (0.43 Tm) and 450 MPa. The effect of stress amplitude on the cyclic creep behavior is studied by measuring the friction stress and the activation energy for the creep. Cyclic creep acceleration is observed and the cyclic creep rate increases with the stress amplitude. The activation energy for cyclic creep is slightly lower than that for static creep and the activation energy for cyclic creep deformation is not affected by the stress amplitude. In the cyclic creep deformation, the fact that the activation energy is not significantly affected by the stress amplitude means the deformation mechanism is independent of the stress amplitude. From the above results, it is considered that the cyclic creep rate is controlled by the friction stress level and the recovery rate during unloading by the dislocation core diffusion. |