{
  "analysis": {
    "type": "linear_static",
    "method": "direct"
  },
  "nodes": [
    [0.0, 0.0, 0.0],
    [1.0, 0.0, 0.0],
    [0.0, 1.0, 0.0],
    [0.0, 0.0, 1.0]
  ],
  "elements": [
    {"type": "TET4", "nodes": [0, 1, 2, 3], "material": "steel"}
  ],
  "materials": {
    "steel": {"type": "isotropic_3d", "E": 210000000000.0, "nu": 0.3, "density": 7800.0}
  },
  "fixed_dofs": [
    {"node": 0, "dofs": ["UX", "UY", "UZ"]},
    {"node": 2, "dofs": ["UX", "UY", "UZ"]},
    {"node": 3, "dofs": ["UX", "UY", "UZ"]}
  ],
  "loads": [
    {"node": 1, "dof": "UX", "value": 1000.0}
  ]
}