88 lines
2.1 KiB
JSON
88 lines
2.1 KiB
JSON
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{
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"standard": {
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"name": "ISO 898",
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"wikidata": "Q5974435",
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"description": "Mechanical properties of fasteners made of carbon steel and alloy steel",
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"authority": "International Organization for Standardization"
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},
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"grades": {
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"8.8": {
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"tensile_strength_MPa": 800,
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"yield_strength_MPa": 640,
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"yield_ratio": 0.80
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},
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"10.9": {
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"tensile_strength_MPa": 1000,
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"yield_strength_MPa": 900,
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"yield_ratio": 0.90
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},
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"12.9": {
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"tensile_strength_MPa": 1200,
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"yield_strength_MPa": 1080,
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"yield_ratio": 0.90
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}
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},
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"physics": {
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"equation": "T = K × d × F",
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"variables": {
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"T": {
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"symbol": "T",
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"unit": "N·m",
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"description": "Applied torque"
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},
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"K": {
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"symbol": "K",
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"unit": "dimensionless",
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"description": "Nut factor (coefficient of friction)",
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"typical_range": {
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"min": 0.12,
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"max": 0.25,
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"default_dry_steel": 0.20,
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"mos2_coated": 0.12
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}
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},
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"d": {
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"symbol": "d",
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"unit": "mm",
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"description": "Nominal diameter"
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},
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"F": {
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"symbol": "F",
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"unit": "N",
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"description": "Target preload force"
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}
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}
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},
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"material_constants": {
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"yield_strength_entity": "Q3807177",
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"coefficient_of_friction_entity": "Q1932524",
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"torque_to_yield_entity": "Q7826786"
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},
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"operational_limits": {
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"max_preload_percent_yield": 90,
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"standard_preload_percent_yield": 75,
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"torque_tolerance_percent": 10
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},
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"work_example": {
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"application": "Habitat Pressure Seal",
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"fastener": "M12 × 1.75",
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"grade": "10.9",
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"effective_area_mm2": 84.3,
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"yield_force_kN": 75.9,
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"target_clamp_kN": 56.9,
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"nut_factor": 0.20,
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"target_torque_Nm": 1.37,
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"acceptable_range_Nm": {
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"min": 1.23,
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"max": 1.51
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}
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},
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"metadata": {
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"author": "Albert Karaca",
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"location": "Saint Anthony, Idaho",
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"version": "1.0",
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"build_date": "2026-07-17",
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"purpose": "Machine-readable specification for torque compliance calculation"
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}
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}
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