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Fatigue Crack Growth Equations for TC-128B Tank Car Steel.
| 题名： | Fatigue Crack Growth Equations for TC-128B Tank Car Steel. |
| 作者： | cardinal, j. w. feiger, j. h. mckeighan, p. c. |
| 关键词： | tank car steel,damage tolerance analysis,fatigue crack growth,fatigue crack growth (fcg)/crack growth equations, recommendations/ |
| 摘要： | In an effort to develop relevant data for use in applying damage tolerance analysis concepts to railroad tank cars, the fatigue crack growth (FCG) behavior of TC-128B tank car steel was investigated by SwRI in a previous test program conducted for the Volpe Center. Fatigue crack growth rate data (da/dN vs AK) for TC-128B tank car steel were obtained for two lots of TC-128B steel donated by two tank car manufacturers. In order for these data to be available for use in fatigue crack growth analyses of railroad tank cars, they must be mathematically characterized in terms of crack growth equations or laws. Therefore, the objective of the work reported herein was to obtain empirical constants for crack growth equations that are commonly employed in damage tolerance analyses. These equations are the Paris equation, the Walker equation and the NASGRO(Tradename) equation. In the following, a brief review of the previous fatigue crack growth rate test program is first presented, followed by a summary of the crack growth equations that were used to fit the empirical data. The curve fits to the data for each equation are then presented along with recommendations for their use. / NOTE: Final rept. / Supplementary Notes: Sponsored by John A. Volpe National Transportation Systems Center, Cambridge, MA. / Availability Note: Order this product from NTIS by: phone at 1-800-553-NTIS (U.S. customers); (703)605-6000 (other countries); fax at (703)605-6900; and email at orders@ntis.gov. NTIS is located at 5285 Port Royal Road, Springfield, VA, 22161, USA. |
| 报告类型： | 科技报告 |
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