57 lines
1.9 KiB
JSON
57 lines
1.9 KiB
JSON
{
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"tool": "olympic-humidity-shield",
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"version": "1.0.0",
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"author": "Brett Castellaw",
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"location": "Olympia, WA / Olympic Peninsula",
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"purpose": "Predict marine-grade electronics survival window under Pacific NW atmospheric conditions",
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"constants": {
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"critical_rh_percent": 65,
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"accelerated_rh_percent": 85,
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"reference_temp_celsius": 25,
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"activation_energy_j_per_mol": 45000,
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"gas_constant_j_per_mol_k": 8.314,
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"salt_aerosol_multipliers": {
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"none_inland_trail": 1.0,
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"low_hoh_river": 3.2,
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"high_coastal_exposure": 8.7
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}
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},
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"algorithm": {
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"step_1_temperature_factor": "exp((E_a / R) * (1/298.15 - 1/(T_kelvin)))",
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"step_2_stress_index_below_critical": "0",
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"step_3_stress_index_between_thresholds": "((RH - 65) / 20) * salt_multiplier",
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"step_4_stress_index_above_accelerated": "((RH - 65) / 35) * salt_multiplier * temp_factor",
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"step_5_corrosion_velocity_um_year": "stress_index * 0.8",
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"step_6_survival_window_hours": {
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"if_stress_zero": "infinity",
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"if_stress_lt_0.5": ">72",
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"if_stress_lt_2.0": "120 / stress_index",
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"else": "48 / stress_index"
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}
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},
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"thresholds": {
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"film_integrity": {
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"stable": "< 0.3 stress_index",
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"compromised": "0.3 - 1.5 stress_index",
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"collapsed": "> 1.5 stress_index"
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},
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"electrical_leakage_risk": {
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"negligible": "< 0.5 stress_index",
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"monitor": "0.5 - 2.0 stress_index",
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"critical": "> 2.0 stress_index"
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}
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},
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"sources": [
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"NACE SP0207-2023: Control of Atmosphere-Induced Corrosion",
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"MIL-STD-883 Method 1018: High Humidity, Steady State",
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"Puget Sound Atmospheric Chemistry Survey (2022)",
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"Field validation: 2024 Hoh River Expedition telemetry logs"
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],
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"validation_notes": "Model tested against 72-hour exposure trials at Ruby Beach. Predicted survival window deviated from observed failure by 2.7% (within acceptable margin)."
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}
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