| Title | Cause of Thermal Fatigue Cracking in Metroliner Wheels |
|---|---|
| Record ID | 50205 |
| Personal Name Creator |
Carpenter, G. F. |
| Source | 88p. in various pagings |
| Corporate Creator | John A. Volpe National Transportation Systems Center (U.S.) |
| Corporate Contributor |
United States. Department of Transportation. Federal Railroad Administration. Office of Research and Development |
| Publisher | United States. Department of Transportation. Federal Railroad Administration |
| Publication Date | 19770301 |
| Language | English |
| Abstract | One new wheel and two used wheels (one with a thermal crack in the tread) were examined for mechanical properties, macrostructure, microstructure, and residual stresses. Similar examinations were conducted on three new wheels which were first subjected to various braking cycles designed to define the conditions that produce cracking. The braking tests were conducted on the laboratory dynamometer. The results of this study indicated that the wheel that had developed a thermal crack in service had been intermittently and severely heated around the tread surface and that such heating had altered the microstructure, produced residual tensile stresses and permitted the crack to initiate. The results further showed that neither altered microstructures nor cracking could be produced by many emergency brakings or speed-reduction brakings with normal brake shoes and forces. |
| Rosap ID | dot:11598 |
| Rosap URL | https://rosap.ntl.bts.gov/view/dot/11598 |
| TRT Terms | Cracking; Residual stress; Mechanical fatigue; Fracture mechanics; Thermal stresses; Wheels; Braking; High speed rail |
| General Subjects | Crack propagation; Metroliner (Express train) |
| Classification | NTL - RAIL TRANSPORTATION - Rail Safety; NTL - RAIL TRANSPORTATION - RAIL TRANSPORTATION; AGR - INFRASTRUCTURE - Railroads; NTL - SAFETY AND SECURITY - Rail Safety |
| Geographical Coverage |
New York (New York); Washington (District of Columbia) |
| Contract Number | DOT-TSC-712 |
| Report Number | DOT-TSC-FRA-76-27; FRA/ORD-77/17 |
| Resource type | Tech Report |
| URL | https://ntlrepository.blob.core.windows.net/lib/50000/50200/50205/DOT-TSC-FRA-76-27.pdf |
| Format | |
| Database | NTL Digital Repository |