Isothermal Fatigue and Creep-Fatigue Interaction Behavior of Nickel-Base Directionally Solidified Superalloy

• Дата: 2018
• Автори: Haq, A.U., Yang, X.G., Shi, D.Q.
• Формат: Стаття
• Мова: English
• Опубліковано: Інститут проблем міцності ім. Г.С. Писаренко НАН України 2018
• Назва видання: Проблемы прочности
• Теми: Научно-технический раздел
• Онлайн доступ: http://dspace.nbuv.gov.ua/handle/123456789/173819
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Цитувати: Isothermal Fatigue and Creep-Fatigue Interaction Behavior of Nickel-Base Directionally Solidified Superalloy / A.U. Haq, X.G. Yang, D.Q. Shi // Проблемы прочности. — 2018. — № 1. — С. 112-120. — Бібліогр.: 21 назв. — англ.

The creep-fatigue interaction in directionally solidified nickel-base superalloy was analyzed with the modified Chaboche-based unified viscoplasticity constitutive model. The model features the anisotropic material behavior, hardening/ softening, and stress relaxation. Simple low-cyclic fatigue and specified hold time experiments were conducted on a directionally solidified superalloy (DZ125) at temperatures over 760°C. The material parameters were optimized considering its tensile, cyclic and creep behavior with the Levenberg–Marquardt optimization procedure. The model was constructed in FORTRAN and integrated in FEA software UMAT/ABAQUS. The results show that experimental and simulated hysteresis loop size/shape, peak stresses, stress relaxation, and related areas are closely matched. The modified constitutive model was found to be instrumental for revealing the fatigue and creep-fatigue interaction behavior of such materials and can be used for practical applications.