Fatigue Crack Growth: stainless_steel
Paris Law fatigue crack growth constants (C and m) for engineering alloys at stress ratio R=0.1 in air at room temperature. Provides da/dN = C * delta_K^m where da/dN is crack growth rate in m/cycle and delta_K is stress intensity factor range in MPa*sqrt(m). Also includes threshold stress intensity range delta_Kth (MPa*sqrt(m)), plane-strain fracture toughness KIC (MPa*sqrt(m)), yield strength, and UTS. Covers structural steels (A36, A514, 4340, 300M, 4130, HY-80), stainless steels (304, 316, 316L, 17-4PH, 2205 duplex), aluminum alloys (2024-T3, 7075-T6, 7075-T651, 6061-T6, 6061-T651, 2219-T87, 7050-T7452, 2024-T851, 5083-H116), titanium alloys (Ti-6Al-4V annealed/STA/EB-welded/LPBF, Ti-3Al-2.5V, Ti-10V-2Fe-3Al), and nickel superalloys (Inconel 718 annealed/STA, Inconel 625, Waspaloy, Hastelloy C-276). Data from NASGRO database, AFGROW, MMPDS-11, Dowling, and ASM Handbook Vol.19.
| material family | alloy designation | C SI (m/cycle per (MPa*sqrt(m))^m) | C units note | KIC MPa sqrtm (MPa*sqrt(m)) | R ratio (dimensionless) | UTS MPa (MPa) | delta Kth MPa sqrtm (MPa*sqrt(m)) | environment | m (dimensionless) | notes | yield strength MPa (MPa) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| stainless_steel | 17-4 PH Stainless Steel (H900) | 0 | da/dN in m/cycle; delta_K in MPa*sqrt(m) | 77 | 0.1 | 1,310 | 4 | air RT | 3 | Precipitation hardened 17-4 PH at H900 condition; high strength; moderate Kic; used in aerospace structural attachments | 1,172 |
| stainless_steel | 2205 Duplex Stainless Steel | 0 | da/dN in m/cycle; delta_K in MPa*sqrt(m) | 165 | 0.1 | 655 | 7 | air RT | 3.1 | Duplex SS 2205; austenite-ferrite microstructure; lower FCG rate than austenitic SS due to high strength and high Kth from crack deflection at phase boundaries | 448 |
| stainless_steel | 304 Austenitic Stainless Steel | 0 | da/dN in m/cycle; delta_K in MPa*sqrt(m) | 200 | 0.1 | 517 | 6 | air RT | 3.25 | Austenitic 304 SS; Paris constants from Danysc compilation (C=5.6e-12 m/cycle); high Kth due to austenite toughness; plane strain Kic very high (>200 MPa√m); largely ductile fracture | 207 |
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