{
  "version": "1.0",
  "description": "Common engineering materials database for validation and guidance",
  "materials": [
    {
      "id": "al_6061_t6",
      "names": ["aluminum 6061-t6", "al6061-t6", "6061-t6", "al 6061", "6061 aluminum", "aa6061-t6"],
      "category": "aluminum",
      "properties": {
        "density_kg_m3": 2700,
        "yield_stress_mpa": 276,
        "ultimate_stress_mpa": 310,
        "elastic_modulus_gpa": 68.9,
        "shear_modulus_gpa": 26,
        "poisson_ratio": 0.33,
        "fatigue_limit_mpa": 96,
        "thermal_conductivity_w_mk": 167,
        "cte_per_k": 23.6e-6
      },
      "notes": "Common aerospace aluminum alloy. Good machinability, corrosion resistance.",
      "recommended_safety_factors": {
        "static": 1.5,
        "fatigue": 3.0,
        "aerospace": 2.0
      }
    },
    {
      "id": "al_2024_t3",
      "names": ["aluminum 2024-t3", "al2024-t3", "2024-t3", "al 2024", "2024 aluminum"],
      "category": "aluminum",
      "properties": {
        "density_kg_m3": 2780,
        "yield_stress_mpa": 345,
        "ultimate_stress_mpa": 483,
        "elastic_modulus_gpa": 73.1,
        "shear_modulus_gpa": 28,
        "poisson_ratio": 0.33,
        "fatigue_limit_mpa": 138,
        "thermal_conductivity_w_mk": 121,
        "cte_per_k": 23.2e-6
      },
      "notes": "High-strength aerospace aluminum. Excellent fatigue resistance.",
      "recommended_safety_factors": {
        "static": 1.5,
        "fatigue": 2.5,
        "aerospace": 2.0
      }
    },
    {
      "id": "al_7075_t6",
      "names": ["aluminum 7075-t6", "al7075-t6", "7075-t6", "al 7075", "7075 aluminum"],
      "category": "aluminum",
      "properties": {
        "density_kg_m3": 2810,
        "yield_stress_mpa": 503,
        "ultimate_stress_mpa": 572,
        "elastic_modulus_gpa": 71.7,
        "shear_modulus_gpa": 26.9,
        "poisson_ratio": 0.33,
        "fatigue_limit_mpa": 159,
        "thermal_conductivity_w_mk": 130,
        "cte_per_k": 23.4e-6
      },
      "notes": "Very high strength aluminum. Used in aircraft structures.",
      "recommended_safety_factors": {
        "static": 1.5,
        "fatigue": 2.5,
        "aerospace": 2.0
      }
    },
    {
      "id": "steel_304",
      "names": ["stainless steel 304", "ss304", "304 stainless", "304ss", "aisi 304"],
      "category": "steel",
      "properties": {
        "density_kg_m3": 8000,
        "yield_stress_mpa": 215,
        "ultimate_stress_mpa": 505,
        "elastic_modulus_gpa": 193,
        "shear_modulus_gpa": 77,
        "poisson_ratio": 0.29,
        "fatigue_limit_mpa": 240,
        "thermal_conductivity_w_mk": 16.2,
        "cte_per_k": 17.3e-6
      },
      "notes": "Austenitic stainless steel. Excellent corrosion resistance.",
      "recommended_safety_factors": {
        "static": 1.5,
        "fatigue": 2.5
      }
    },
    {
      "id": "steel_316",
      "names": ["stainless steel 316", "ss316", "316 stainless", "316ss", "aisi 316"],
      "category": "steel",
      "properties": {
        "density_kg_m3": 8000,
        "yield_stress_mpa": 290,
        "ultimate_stress_mpa": 580,
        "elastic_modulus_gpa": 193,
        "shear_modulus_gpa": 77,
        "poisson_ratio": 0.29,
        "fatigue_limit_mpa": 260,
        "thermal_conductivity_w_mk": 16.3,
        "cte_per_k": 16e-6
      },
      "notes": "Marine grade stainless steel. Superior corrosion resistance to 304.",
      "recommended_safety_factors": {
        "static": 1.5,
        "fatigue": 2.5
      }
    },
    {
      "id": "steel_4340",
      "names": ["steel 4340", "4340 steel", "aisi 4340", "4340"],
      "category": "steel",
      "properties": {
        "density_kg_m3": 7850,
        "yield_stress_mpa": 862,
        "ultimate_stress_mpa": 1034,
        "elastic_modulus_gpa": 205,
        "shear_modulus_gpa": 80,
        "poisson_ratio": 0.29,
        "fatigue_limit_mpa": 480,
        "thermal_conductivity_w_mk": 44.5,
        "cte_per_k": 12.3e-6
      },
      "notes": "High strength alloy steel. Heat treatable.",
      "recommended_safety_factors": {
        "static": 1.5,
        "fatigue": 2.5
      }
    },
    {
      "id": "steel_a36",
      "names": ["steel a36", "a36 steel", "astm a36", "a36", "structural steel"],
      "category": "steel",
      "properties": {
        "density_kg_m3": 7850,
        "yield_stress_mpa": 250,
        "ultimate_stress_mpa": 400,
        "elastic_modulus_gpa": 200,
        "shear_modulus_gpa": 79,
        "poisson_ratio": 0.26,
        "fatigue_limit_mpa": 160,
        "thermal_conductivity_w_mk": 51.9,
        "cte_per_k": 11.7e-6
      },
      "notes": "Common structural steel. Low cost, good weldability.",
      "recommended_safety_factors": {
        "static": 1.67,
        "fatigue": 3.0
      }
    },
    {
      "id": "ti_6al_4v",
      "names": ["titanium 6al-4v", "ti-6al-4v", "ti64", "ti 6-4", "grade 5 titanium"],
      "category": "titanium",
      "properties": {
        "density_kg_m3": 4430,
        "yield_stress_mpa": 880,
        "ultimate_stress_mpa": 950,
        "elastic_modulus_gpa": 113.8,
        "shear_modulus_gpa": 44,
        "poisson_ratio": 0.342,
        "fatigue_limit_mpa": 500,
        "thermal_conductivity_w_mk": 6.7,
        "cte_per_k": 8.6e-6
      },
      "notes": "Common aerospace titanium alloy. Excellent strength-to-weight ratio.",
      "recommended_safety_factors": {
        "static": 1.5,
        "fatigue": 2.5,
        "aerospace": 2.0
      }
    },
    {
      "id": "ti_cp_grade2",
      "names": ["titanium grade 2", "cp titanium", "commercially pure titanium", "ti grade 2"],
      "category": "titanium",
      "properties": {
        "density_kg_m3": 4510,
        "yield_stress_mpa": 275,
        "ultimate_stress_mpa": 345,
        "elastic_modulus_gpa": 105,
        "shear_modulus_gpa": 40,
        "poisson_ratio": 0.37,
        "fatigue_limit_mpa": 160,
        "thermal_conductivity_w_mk": 16.4,
        "cte_per_k": 8.4e-6
      },
      "notes": "Commercially pure titanium. Good corrosion resistance, formability.",
      "recommended_safety_factors": {
        "static": 1.5,
        "fatigue": 2.5
      }
    },
    {
      "id": "inconel_718",
      "names": ["inconel 718", "in718", "alloy 718", "nickel 718"],
      "category": "nickel_alloy",
      "properties": {
        "density_kg_m3": 8190,
        "yield_stress_mpa": 1100,
        "ultimate_stress_mpa": 1375,
        "elastic_modulus_gpa": 200,
        "shear_modulus_gpa": 77,
        "poisson_ratio": 0.29,
        "fatigue_limit_mpa": 600,
        "thermal_conductivity_w_mk": 11.4,
        "cte_per_k": 13e-6
      },
      "notes": "Nickel superalloy. Excellent high-temperature properties.",
      "recommended_safety_factors": {
        "static": 1.5,
        "fatigue": 2.5
      }
    },
    {
      "id": "zerodur",
      "names": ["zerodur", "schott zerodur", "zerodur glass ceramic"],
      "category": "glass_ceramic",
      "properties": {
        "density_kg_m3": 2530,
        "yield_stress_mpa": null,
        "ultimate_stress_mpa": 50,
        "elastic_modulus_gpa": 90.3,
        "shear_modulus_gpa": 36.3,
        "poisson_ratio": 0.24,
        "fatigue_limit_mpa": null,
        "thermal_conductivity_w_mk": 1.46,
        "cte_per_k": 0.05e-6
      },
      "notes": "Ultra-low expansion glass ceramic for optics. Brittle - tensile stress limit only.",
      "recommended_safety_factors": {
        "static": 4.0,
        "optical": 8.0
      }
    },
    {
      "id": "cfrp_unidirectional",
      "names": ["carbon fiber", "cfrp", "carbon fiber reinforced polymer", "cfrp ud"],
      "category": "composite",
      "properties": {
        "density_kg_m3": 1600,
        "yield_stress_mpa": null,
        "ultimate_stress_mpa": 1500,
        "elastic_modulus_gpa": 135,
        "shear_modulus_gpa": 5,
        "poisson_ratio": 0.3,
        "fatigue_limit_mpa": 600,
        "thermal_conductivity_w_mk": 5,
        "cte_per_k": -0.5e-6
      },
      "notes": "Unidirectional carbon fiber. Properties in fiber direction. Highly anisotropic.",
      "recommended_safety_factors": {
        "static": 2.0,
        "fatigue": 3.0
      }
    }
  ]
}