Large Scale Optimal Transportation Meshfree (OTM) Simulations of Hypervelocity Impact
Im Rahmen des Schwerpunktprogramms SPP1886 lädt die Fakultät am Montag den 22. Mai 15.00 Uhr in die August-Bebel-Str. 30, Raum 03-07 ein. Es referiert Prof. Michael Ortiz, vom California Institute of Technology:
Large scale three-dimensional numerical simulations of hypervelocity impact of Aluminum alloy 6061-T6 plates by Nylon 6/6 cylindrical projectile have been performed using the Optimal Transportation Meshfree (OTM) method along with the seizing contact and variational material Point failure algorithm. The dynamic response of the Al6061-T6 plate including phase transition in the high strain rate, high pressure and high temperature regime expected in our numerical analysis is described by the use of a variational thermomechanical coupling constitutive model with SESAME equation of state, rate-dependent J2 plasticity with power law hardening and thermal softening and temperature dependent Newtonian viscosity. A polytropic type of equation of state fit to inhouse ReaxFF calculations is employed to model the Nylon 6/6 projectile under extreme conditions. The evaluation of the performance of the numerical model takes the form of a conventional validation analysis. In support of the analysis, we have conducted experiments over a range of plate thicknesses of [0.5, 3.0] mm, a range of impact velocities of [5.0, 7.0] km/s and a range of obliquities of [0, 70] degrees at Caltech’s Small Particle Hypervelocity Range (SPHIR) Facility. Large scale three-dimensional OTM simulations of hypervelocity impact are performed on departmental class systems using a dynamic load balancing MPI/PThreads parallel implementation of the OTM method. We find excellent full field agreement between measured and computed Perforation areas, debris cloud and temperature field.
We are pleased to announce the lecture of Prof. Michael Ortiz
Monday, 22 May 2017
Room 03-07, 15.00