Effect of Temperature and Strain Rate on Critical Damage Factor of High Strength Ring Chain
The influences of deformation condition on the critical damage factor of high strength ring chain were analyzed.A basic research approach that physical experiments and numerical simulation can provide mutual support for the critical damage factor was established.As several series of billet samples were compressed on heat physical simulation machine under different deformation temperatures and strain rates,the true stress-true strain data collected can realize the performance of the simulations.The simulation results show that the maximum damage value always appears on the outer edge of upset ting drum,and damaged softening behavior is more sensitive to strain rate.A concept of damage sensitive rate was brought forward and its values were computed.The intersection of line fitted and horizontal is obtained as the fracture step and its relative maximum damage is a critical damage factor.The critical damage distribution shows that the critical damage factor is not a constant but a change with the range of 0.15-0.54.