A thermo-mechanically coupled phase-field fatigue fracture model
摘要
A thermo-mechanically coupled phase-field fatigue fracture model is proposed to investigate the fatigue behavior of brittle materials under cyclic thermo-mechanical loading. Temperature-dependent parameters, including fatigue threshold and fracture toughness, are introduced to describe the temperature-dependent fatigue response. Several numerical examples are presented to demonstrate the model’s capability in simulating the thermo-mechanical fatigue fracture process. Benchmark simulation on fatigue under homogeneous uniaxial fatigue response is performed to validate the concept and the basic features of the model. Subsequent examples demonstrate the model’s ability in simulating fatigue cracking under cyclic mechanical loading with nonuniform temperature, as well as replicating Paris law under nonuniform temperature fields. Simulation of a V-notched plate under cyclic thermal loading is further carried out to show the model’s effectiveness in capturing thermal fatigue fracture behavior.