{
 "title": "Elastic–perfectly plastic thick cylinder: collapse pressure",
 "kind": "theory",
 "source": "Hill, The Mathematical Theory of Plasticity, Oxford 1950, ch. V §2: plane strain von Mises collapse pressure p = (2/√3)σ_y ln(b/a)",
 "status": "pending",
 "requires": "implicit (static) J2 plasticity: explicit J2 is in, a collapse load needs the static solver",
 "quantities": [
  {
   "id": "p_collapse",
   "quantity": "collapse pressure for a = 10, b = 20, σ_y = 250",
   "value": 200.0944
  }
 ]
}