| MAO You-sheng 1 ， LI Tong 1 ， JIA Wen-bin 1，2 ， LI Xin 1 ， LIU Fei-long 1 ， FANG Lei 1.Multiaxial Thermo-mechanical Viscoplastic Constitutive Model and Verification of GH4169 Alloy[J].航空发动机,2024,50(3):160-168 |
| Multiaxial Thermo-mechanical Viscoplastic Constitutive Model and Verification of GH4169 Alloy |
| DOI： |
| Key Words:GH4196 multiaxial fatigue thermo-mechanical fatigue Chaboche model Lemaitre damage model critical plane
theory viscoplastic potential function correction coefficient |
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| Abstract:In order to describe the multiaxial thermo-mechanical behavior of GH4169 alloy more accurately， based on the Chaboche
viscoplastic constitutive model， by introducing the Lemaitre damage model， the non-proportional strengthening factor based on critical
plane theory， and the viscoplastic potential function correction coefficient， a multiaxial thermo-mechanical fatigue viscoplastic constitu?
tive model suitable for GH4169 alloy was proposed to describe cyclic softening， non-proportional hardening， and non-Masing behavior of
the material， and the method for obtaining the parameters of the constitutive model was provided. This constitutive model was used to
simulate the multiaxial and thermo-mechanical behavior of GH4169 alloy. The results show that at 20 ℃， for the simulations of the
hysteresis loops of the 200th cycle under five loading conditions （axial loading， torsional loading， proportional loading， 45 ° non-
proportional loading， and 90 ° non-proportional loading）， the results of the axial stress peaks and valleys are consistent with the
experimental results； at 650 ℃， for the simulation of the hysteresis loops of the 200th cycle under three loading conditions （proportional
loading， 45 ° non proportional loading， and 90 ° non proportional loading）， the results are basically consistent with the experimental
results， proving that the established model is suitable for high temperature conditions； for the simulations of the hysteresis loops of
uniaxial axial loading and circular path loading at 300 ℃， 550 ℃， and 650 ℃， the results are basically consistent with the experimental
values； for the simulations of the hysteresis loops of the 200th cycle under in-phase and antiphase loading conditions， the simulated
values of the corrected constitutive model are in good agreement with the experimental values. |
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