Simulation of Mechanical System Kinematic Operation Subsequent to High Intensity Loading

The simulation workflow to be developed in Phase I consists of an UNDEX simulation to establish the damage in the system, in terms of permanent set which may change the hatch actuation forces and simulation of the kinematics of the damaged elements to determine qualification. UNDEX simulations using finite element codes such as EPSA are in wide use throughout the NAVSEA community and their validation is taken as a given in this document. At issue is the transfer of the damaged state to a quasi-static simulation of SHKO, which includes the effects of friction and material damage. Using simulations in place of large-scale testing is feasible, based on these initial assessments. Future work will include prototyping such a workflow: shot selection, UNDEX analysis, mapping of the damaged post-UNDEX state, SHKO, and quantification of uncertainty of hatch operability. In addition, test planning for the supporting material and unit tests will be done.