On multiaxial creep–fatigue considering the non-proportional loading effect: Constitutive modeling, deformation mechanism, and life prediction

• DOI: 10.1016/j.ijplas.2022.103337
• Publication Date: 2022-05-14T15:11:58Z
• Authors: Le XU; Run-Zi WANG; Ji WANG; Lei HE; Takamoto ITOH; Hideo MIURA; Xian-Cheng ZHANG; Shan-Tung TU
• Keywords: Hardening (computing); Viscoplasticity; Stress relaxation; Dynamic Recrystallization

In this paper, a series of strain-controlled fatigue and creep–fatigue tests under proportional/non-proportional loadings were performed for type 304 stainless steel at 873 K. Then, post-test metallographic observations through the electron back scattered diffraction (EBSD) transmission microscope (TEM) combinative characterizations. aspect, wavy slip dominated deformation mechanism non-proportional was considered as essence additional hardening, while introduction creep resulted in further microstructure evolutions by facilitating recrystallization. Afterward, unified viscoplasticity constitutive model proposed to simulate cyclic stress–strain responses, which an hardening parameter combined with loading-path used describe curves. Concurrently, stress triaxiality introduced provide accurate descriptions relaxation behavior. Semi-physical continuum damage models involving multiaxial factor strain energy predict evaluations. Good agreements between experimental data simulated results achieved help numerical procedures.