The problem seems to be related to directly editing the keyword file when accessed from Abaqus 2017 CAE. My models are quite simple and straight forward as they consist of a single thin plate, fixed at its boundaries and loaded with a pressure time history to represent an idealized blast load. The model is made using the CAE graphical interface, but the material model implemented is the modified Johnson-Cook, demanding an additional material model library. This means that the material parameters has to be edited either trough writing directly to the generated input file, or by accessing the keyword file trough the CAE. This is where the problem comes in. Most of the models run perfect, but from time to time the change in a material parameter accessed by opening the keyword file result in the .odb file to not contain any history output data. This is very strange as the solution is still valid, as all field outputs are written and can be inspected. All the defined history outputs are still in the .odb file, but contain no data. The problem is magnified by the fact that all models in the affected CAE file is corrupted by the change in one of the models contained by the CAE file.

• If anyone has encountered the same problem or even better found a solution to the problem, please let me know! The bug is really destroying the progress in the thesis!