{
  "title": "Coating specimen flexibility quantities",
  "scope": "Specified FBE specimen method; no installed pipe stress or forming acceptance",
  "quantities": {
    "Dm": "Mandrel diameter mm",
    "t": "Specimen metal wall thickness mm, not coating thickness",
    "s": "Dimensionless strain factor",
    "d": "Ring original mid-wall diameter mm",
    "d2": "Ring reduced mid-wall axis mm"
  },
  "methods": {
    "strip": "Dm=t*(1-s)/s; three-point or cantilever bending",
    "ring": "d2=d/((s/t)*d+1); guide to squeezed-ring method"
  },
  "conditions": [
    "Cold cut; initially holiday free",
    "At least300mm pipe diameter: four longitudinal300x50mm strips; smaller: four50mm-wide rings",
    "Two tests at0\u00b0C withs0.02, two at20\u00b0C withs0.03",
    "Deflection loading25\u00b12mm/min; holiday afterdeformation fails test"
  ],
  "examples": [
    {
      "t_mm": 6,
      "s": 0.02,
      "temperature_C": 0,
      "Dm_mm": 294,
      "d_mm": 200,
      "d2_mm": 120
    },
    {
      "t_mm": 6,
      "s": 0.03,
      "temperature_C": 20,
      "Dm_mm": 194,
      "d_mm": 200,
      "d2_mm": 100
    }
  ],
  "geometry": "Separate strip cross-section labels metal-wall thickness t beneath coating; conceptual bending around mandrel. Ring mid-wall circle and reduced ellipse; no fixture dimensions or manufactured sample supplied."
}