TY - GEN
T1 - Fatigue life prediction under biaxial falstaff loading using statistical volume element based multiscale modeling
AU - Zhang, Jinjun
AU - Liu, Kuang
AU - Chattopadhyay, Aditi
PY - 2012
Y1 - 2012
N2 - This article presents the fatigue life prediction in a cruciform specimen of 2024-T351 aluminum alloy subjected to biaxial FALSTAFF loading. An energyand slip-based multiscale damage criterion is developed to capture the fatigue crack formation in crystalline metallic materials. In these materials, there are two stages in crack initiation: nucleation of micro cracks and coalescence of micro cracks into major cracks. In the first stage, micro cracks generate from intermetallic particles and extend into surrounding grains. For the FCC crystalline structure, fatigue damage increments in four dependent slip planes are calculated and accumulated to measure micro crack. In the second stage, the micro cracks grow and coalesce into major cracks. Subsequently, a meso-statistical volume element model is developed to represent the microstructure of the material. Finally, a root mean square method is introduced to take into account FALSTAFF loading. Using the root mean square (RMS) method, the loading history for tests is analyzed to determine the RMS maximum and minimum stresses. The multiscale damage criterion, statistical volume element and RMS method were validated using previously conducted fatigue tests on cruciform samples. The fatigue life and crack direction predicted using the developed model correlate well with the experiments.
AB - This article presents the fatigue life prediction in a cruciform specimen of 2024-T351 aluminum alloy subjected to biaxial FALSTAFF loading. An energyand slip-based multiscale damage criterion is developed to capture the fatigue crack formation in crystalline metallic materials. In these materials, there are two stages in crack initiation: nucleation of micro cracks and coalescence of micro cracks into major cracks. In the first stage, micro cracks generate from intermetallic particles and extend into surrounding grains. For the FCC crystalline structure, fatigue damage increments in four dependent slip planes are calculated and accumulated to measure micro crack. In the second stage, the micro cracks grow and coalesce into major cracks. Subsequently, a meso-statistical volume element model is developed to represent the microstructure of the material. Finally, a root mean square method is introduced to take into account FALSTAFF loading. Using the root mean square (RMS) method, the loading history for tests is analyzed to determine the RMS maximum and minimum stresses. The multiscale damage criterion, statistical volume element and RMS method were validated using previously conducted fatigue tests on cruciform samples. The fatigue life and crack direction predicted using the developed model correlate well with the experiments.
KW - Biaxial FALSTAFF loading
KW - Damage criterion
KW - Multiscale modeling
KW - Statistic volume element
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U2 - 10.1115/IMECE2012-86341
DO - 10.1115/IMECE2012-86341
M3 - Conference contribution
AN - SCOPUS:84887281932
SN - 9780791845240
T3 - ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)
SP - 625
EP - 634
BT - ASME 2012 International Mechanical Engineering Congress and Exposition, IMECE 2012
T2 - ASME 2012 International Mechanical Engineering Congress and Exposition, IMECE 2012
Y2 - 9 November 2012 through 15 November 2012
ER -