FATIGUE CRACK PROPAGATION BEHAVIOR OF 2091 T8 AND 2024 T3 UNDER CONSTANT AND VARIABLE AMPLITUDE LOADINGReportar como inadecuado




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Abstract : The fatigue crack propagation behavior of the damage tolerant 2091 T8 was compared with that of 2024 T3. Constant amplitude tests were performed in vacuum, air, and NaCl solution at R = 0.175 and in air at R = 0.7. The variable amplitude tests included periodic underloads superimposed on constant amplitude tests at R = 0.7, and periodic overloads in combination with low R-ratio tests. In general it was found that the crack propagation resistance of 2091 was slightly inferior in the lower ƊK-region as compared to 2024, but somewhat better at higher ƊK-values. For both alloys predicted propagation rates based on constant amplitude tests were lower than the experimentally measured values with periodic underloads. Periodic overloads resulted in crack growth retardation.





Autor: N. Ohrloff A. Gysler G. Lütjering

Fuente: https://hal.archives-ouvertes.fr/



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