It has just been discovered that the minimum cut-off of the SN curve (and maximum cut-off) was used without applying the partial safety factor. This is relevant in connection with SN curves which transition to “infinite life”, e.g. according to Eurocode 3 or some older textbooks on machine design. The bug leads to non-conservative results. It has been fixed in version 2.053.
A new version has just been released along with an associated example. This time, the main feature is the handling of anisotropic fatigue strength, as is needed in several cases, e.g. for additive manufacturing.
A relatively simple approach is taken, where the fatigue strength is scaled according to the surface angle of a given node relative to a user-defined reference direction, e.g. the direction of gravity during a print.
FatigueToolbox just got a major overhaul. In addition to the Fatlab project, it now contains several other fatigue resources such as publications and fatigue data. In the future, the site will be updated more regularly and with more broad fatigue topics.
As mentioned, the standalone version will be discontinued and only the source will be provided for running under Matlab. This is because the deployed version behaved slightly different than the source version, and ran much slower. So, going forward, development will not be halted by limitations of the deploytool.
One of the limiting issues of the deployed version was in parallel execution of the code. It ran fine in Matlab, but not when deployed. So now this feature has been re-implemented, as of Fatlab 2.022. It uses the Parallel Computing Toolbox. Fatlab will detect whether the toolbox is installed and enable it accordingly. The user can then select a number of cores for the execution under Run Analysis.
Special thanks to Martin Dahl Kilt for helping with this feature and performance issues.