STRESS ANALYSIS CLASS
Detailed Course Schedule, Day 2 (8/5)
8:00-11:30 Materials - Stress and Strain, Elastic Deformation, Yielding
1D nonlinear:
elastic – rubber materials – hyperelastic – nonlinear response, but return to original configuration on
unload.
plastic – initially linear, then material softens (yield). On unload, a permanent strain results. On reload,
the yield stress has changed. On reverse load, the reverse yield stress has also changed.
Discuss – hardening models – isotropic, knematic
Thermal effects on material properties.
Classroom demo – closed form - tension member load up past yield, unload, reload,unload
reverse load – reverse yielding – by hand, then do later in Ansys
1:00-4:30
Introduction to Finite Element Analysis
FEM basics – develop all of the steps of FEM for a simple example, and track any approximations.
Exercises:
Plate with hole – Ansys Booleans , Workbench, Iges import, creating a .txt input file. Reference –
Zienkiewicz, p 470.
Geometry: 36 mm by 20 mm, 1 mm thick, with 5 mm radius hole in center. Use ¼ symmetry, tensile
pressure of 12.15 kg/mm^2 on the 10 mm side. E = 7000 kg/mm2, v=.2. For later: Sy=24.3, tangent
modulus = .032 * E.
Stresses – 4 and 8 noded quads
Save these results – we will run for plasticity later...
References:
O. Zienkiewicz, The Finite Element Method, 3rd Edition, McGraw Hill, 1982.