| Title | Fracture resistance and fatigue crack growth characteristics of railroad wheels and axles |
|---|---|
| Record ID | 46161 |
| Personal Name Creator |
Carter, C. S.; Caton, R. G.; Guthrie, J. L. |
| Source | 138p. in various pagings |
| Corporate Creator | Boeing Company. Commercial Airplane Division for 1992- |
| Corporate Contributor |
John A. Volpe National Transportation Systems Center (U.S.); United States. Department of Transportation. Federal Railroad Administration. Office of Research and Development |
| Publisher | John A. Volpe National Transportation Systems Center (U.S.) |
| Publication Date | 19771130 |
| Language | English |
| Abstract | The effects of chemical composition, temperature and loading rates on the plane strain fracture toughness K sub I sub c of railroad wheels have been determined. Similarly, the effects of these variables were determined for grade U and F railroads axles. The carbon content was determined to be the principal factor controlling K sub I sub c. Sensitivity to loading rate (K sub I sub d) was seen to be a function of the microstructure. Estimates have been made of the minimum size of crack, which could result in the failure of wheels and axles under adverse service conditions. Also investigated were the effects of chemical composition, heat treatment, temperature, stress ratio (R), environment and peak loads on the fatigue crack growth characteristics of wheels and axles. It was seen that the effects of R could be predicted by the Forman equation and that crack growth rates were predominantly affected by R. Otherwise, all values fell within the same scatterband. Predictions of crack growth to criticality as a function of cycles were made for wheels and axles. Based on these calculations, it was concluded that detection of subcritical flaws with a good degree of confidence would only be possible for the classes A and sub A wheels and the grades U and F axles. |
| Rosap ID | dot:9680 |
| Rosap URL | https://rosap.ntl.bts.gov/view/dot/9680 |
| TRT Terms | Axles; Railroad wheels; Fatigue cracking; Fracture mechanics; Mathematical prediction; Carbon steel; Temperature; Railroad safety; Mechanical fatigue; Metallurgy |
| General Subjects | Railroad wheels; Railroad axles; Carbon steels; Fracture toughness; Fatigue crack growth rates |
| Classification | NTL - RAIL TRANSPORTATION - RAIL TRANSPORTATION; NTL - RAIL TRANSPORTATION - Rail Safety |
| Geographical Coverage |
United States |
| TRIS Online Accession No |
196980 |
| Contract Number | RR728/R8309 |
| Report Number | DOT-TSC-FRA-77-20; FRA/ORD-77/50 |
| Availability | Volpe National Transportation Systems Center, Technical Reference Center |
| Resource type | Tech Report |
| URL | https://ntlrepository.blob.core.windows.net/lib/46000/46100/46161/DOT-TSC-FRA-77-20.pdf |
| Format | |
| Database | NTL Digital Repository |