Title: Phase Field Simulations for Fatigue Failure Prediction in Processing
Name: Sikang Yan
Phone: 0631 – 205 - 2126
In the last decade, the phase field method was developed to simulate fracture processes. The biggest advantage of phase field modeling is a unified framework, in which the entire fracture evolution is covered. The phase field method is well established for quasi-static and dynamic brittle fracture. However, within manufacturing processes like cutting, turning and milling, cyclic loads are involved, which usually do not lead to an immediate failure, but rather a failure caused by a fatigue crack growth after a large number of loading cycles. In this spirit, a new phase field model that can handle complex cyclic fatigue process is required.
The current implementation of the phase field model for fatigue crack propagation is based on FEAP  with Fortran as an underlying programming language. For massive and efficient computing in real manufacturing systems, the existing phase field model will be implemented into a new computing platform (FEniCS)  with object-oriented languages, such as C++ and Python. Next, boundary value problems which occur in manufacturing processes will be simulated with the newly developed numerical tool.
A phase field model is developed to predict the lifetime of tools in manufacturing processes and identify the process parameters relevant to detect the onset of damage.