Oasys LS-DYNA Environment 8.1 VOLUME 3 ... - Oasys Software

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Oasys LS-DYNA Environment: User Guide (Version 8.1) Results of Second Model OASYS D3PLOT: INTERFACE SEGMENTS (SECOND ANALYSIS) Velocity 6 4 2 0 -2 -4 -6 -8 -10 E4 -12 0 5 10 15 20 25 30 E-5 Time Vel z - node 201 INTERFACE SEGMENTS (SECOND ANALYSIS) Oasys T/HIS Version 6.1 7-Feb-97 Oasys T/HIS Version 6.1 7-Feb-97 Y Z X .000000000 Page A.126
Oasys LS-DYNA Environment: User Guide (Version 8.1) LS-DYNA Manual Section: *CONTROL_TIMESTEP Example of: Billet Upset Example Filenames: billet_forge.key billet_forge_remap.key Execution: Initial run billet_forge.key Restart billet_forge_remap.key billet_forge_remap.dpf02 Q = remap Description: A rod of steel is forged between two dies. The billet upset problem is a measure of friction under forming conditions. Model: The billet material is isotropic elastic-plastic, and the model has 1/8 symmetry. The billet measures 2.25 inches in height and 1.26 inches in radius. The die compresses the billet 1.60 inches. The relationship between the shear friction and the normal pressure is bilinear. Input: The mass scaling time step size is set to 12 microseconds (*CONTROL_TIMESTEP). The billet nodes contact the die surfaces (*CONTACT_NODES_TO_SURFACE). The Coulomb frictional constant is 0.10 and the constant shear is 2,055 psi . A half sine wave defines the velocity of the die (*DEFINE_LOAD, *BOUNDARY_PRESCRIBED_MOTION). Procedure for remapping: 1. Extract nodal coordinates at the desired time to remap. D3PLOT provides a means for dumping nodal coordinates using the 'write' command. 2. The connectivities of the exterior surface of the original model combined with the deformed nodal coordinates define an enclosed discretized surface. 3. Create a new initial LS-DYNA input deck by remeshing the volume contained by the discretized surface. 4. D3PLOT does not read mixed values of nodes and elements, so move the old binary plot files. Results: The results show that effective plastic strains before and after remapping are unchanged. Reference: Avitzur, B. Lee, C. H. and Altan, T. Page A.127
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Oasys LS-DYNA Environment 8.1 VOLUME 3 ... - Oasys Software

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