Ansys Workbench Study
1. SpaceClaim
Source->Make Independent;
Component, Analysis, Share Topology, Share: for meshing;
Create a coordinate system at the centre of lected objects;
U ‘Prepare’ & ‘Repair’, especially ’Imprint’ for splitting surfaces and ‘Split Body’ for simplification;
No need to deal with contacts;
Do not remove duplicate faces using ‘Duplicates’, which may cau body converted to surface;
Table 1 Process for modification in Ansys SpaceClaim
2. Mechanical：Steady-State Thermal
Engineering Data:
Change the *.xml file version to Ansys version
For creep model, it’s one period of time that counts not transient state.
Units: µmks
Geometry:
Material assignment;
Named Selection: for name lection when tting boundary conditions and post
Reference temperature: for zero thermal strain reference temperature, u welding temperatures
Symmetry:
Model->Symmetry, Num Repeat 2, Method Half, ΔX = 1e-14m, Workbench Tools Appearance Beta check;
Table 2 Process for symmetry boundary conditions in Ansys Mechanical
Meshing:
Number of Divisions 3; Geometry, lect one edge and Size, lect all entities with the same size; Bias Type and Bias Factor;
Meshing method: MultiZome/Sweep; hexagonal mesh is better; If u tetrahedral mesh, do not u degraded tetrahedral elements
Table 3 Process for modification in Ansys Mechanical
Boundary conditions:
For convection surfaces, lect the surfaces layer by layer, cross u ‘Single Select’ and ‘Box lect’, make full u of ‘Hide Boday' and ‘Hide All Other Bodies’, and alternating ‘Face’ and ‘Body’;
No need deal with contacts;
Table 4 Process for thermal initial and boundary conditions in Ansys Mechanical
Internal Heat Generation
Analysis Settings:
Radiosity Controls for convergence
Solution:
Solution Information: Solution Output to choo convergence curves;
3. Mechanical: Static Structural
A quasi-static process is a process that happens slowly enough for the system to remain in internal equilibrium. The thermal stress process can be en as quasi-static process, which means: when the temperature changes, the stress and strain changes immediately. Therefore, it doesn’t matter to u ‘Static Structural’ or ‘Transient Structural’ as they give the same result. Ansys Workbench:
From ‘Steady-State Thermal’ right click ‘Solution’ lect ‘Transfer Data to New’ ‘Static Structural’;
Imported Load: Imported Body Temperature, Source Time: All
Thermal Conditions:
At the high temperature dwell time, relaxation will be fast compared to the low temperature range; thus, a stress-free state much clor to the high temperature tpoint will ttle in, with an overlay of thermal and mechanical excursions. Stress will of cour be higher in the low temperature range. (Poech & Eile, 2000)
Boundary Conditions:
Restrict the 6 DOF, Frictionless Support for two symmetrical surfaces, Displacement z=0 for one point;
Or follow Figure 1 for any object.
Figure 1 Restriction of the 6 DOF
Table 5 Process for structural boundary conditions in Ansys Mechanical
Element Birth and Death:
To activate/deactivate elements in a step.
Analysis Settings:
Set multi-step for changing loading to capture specific time points.
Initial time step: 1e-2s, Minimum time step, 1e-30s; Maximum time step: around 100s for long thermal cycles;
Step Controls can be defined by Time/Substeps for convergence; Nonliear Controls Force Tolerance can be incread to 5%;
Large Deflection: On, for large deflection convergence;
