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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2022, Vol. 43 ›› Issue (12): 426009.doi: 10.7527/S1000-6893.2021.26009

• Material Engineering and Mechanical Manufacturing • Previous Articles     Next Articles

A generalized Bodner-Partom viscoplastic constitutive model

WANG Changyu, XU Kejun, QIN Haiqin, MA Zhongyuan, XIE Jing, XIE Zhenbo   

  1. Qingdao Branch, Naval Aviation University, Qingdao 266041, China
  • Received:2021-06-23 Revised:2021-07-12 Published:2021-08-03
  • Supported by:
    National Natural Science Foundation of China (11772089)

Abstract: To improve the modeling of rate-dependent plasticity and cyclic hardening behaviors of alloys with the Bodner-Partom unified viscoplastic constitutive model, the flow rule is established based on a plastic potential function and no longer limited to Mises criteria. In addition, a plastic strain rate term is introduced to diversify the dynamic recovery of kinematic hardening evolution. By comparing the fit of both generalized and original models with the experimental results, the characterized uniaxial tensile and low-cycle fatigue properties of FGH96 at 550℃ show that the modifications provide sound agreement with the inelastic properties, and the adaptability to overcoming the "oversquare" in hysteresis loop and the capability to express mean stress cyclic relaxation accurately are confirmed. The consideration of different hardening mechanisms brings more flexibility for alloys subjected to high temperature.

Key words: powder metallurgy superalloy, constitutive model, viscoplasticity, hardening, Bodner-Partom

CLC Number: