{
  "engine": "Project Chrono / PyChrono FEA",
  "engine_version": "9.0.1",
  "mesher": "Gmsh",
  "mesher_version": "4.14.1",
  "experiment": "STEP-to-tetrahedral shaft torsion under a nodal end couple",
  "material_density_kg_m3": 7800.0,
  "young_modulus_Pa": 200000000000.0,
  "poisson_ratio": 0.3,
  "tip_torque_N_m": 1.0,
  "mesh_sizes_mm": [2.5, 2.0],
  "minimum_baseline_tip_twist_rad": 0.00015,
  "required_relative_twist_reduction": 0.1,
  "maximum_relative_mesh_twist_change": 0.08,
  "maximum_mesh_improvement_spread": 0.03,
  "maximum_relative_mass_change": 1e-6,
  "maximum_end_pad_missing_mm3": 0.0001,
  "maximum_end_pad_excess_mm3": 0.0001,
  "maximum_envelope_excess_mm3": 0.0001
}