Datum Mesh 0.2.1

Axisymmetric solids: pressure vessels, shafts, discs and nozzles solved from their half-section.

Axisymmetric

• Home › Axisymmetric: draw the half-section to the right of the y axis; it is turned a full circle about it. The canvas shows the axis.
• Results named as engineers read them: radial, axial and hoop stress (σr, σz, σθ), radial and axial displacement, von Mises, principal stresses and the safety factor.
• Points on the axis are held from moving off it by themselves. Loads and reactions are totals for the full circle; the equilibrium check sums the forces along the axis.
• Thermal stress works here too: temperatures are solved round the axis, then the stress.
• A new worked example, Pressure vessel: a cylinder with a hemispherical head under 2 MPa. The hoop stress in the cylinder agrees with pr/t.

Trust

• Help › Verification: 39 checks, all passing. New: a long thick cylinder (Lamé) and a thick hollow sphere under pressure (hoop stress and growth of the bore), each on three meshes with the error falling; a round bar pulled along its axis and a free tube warmed evenly, both exact.

Meshing

• The automatic element size is finer for thin parts (about 800 triangles over the part), so a thin wall gets several elements through it instead of one.