loading page

High-temperature Cyclic Deformation Behavior and Damage-coupled Unified Viscoplastic Constitutive Model for a Ductile Cast Iron QTRSi4Mo1
  • +3
  • Zhenxing Wu,
  • Xuedong Chen,
  • Zhichao Fan,
  • Yu Zhou,
  • Jinwen Yu,
  • Heng Jiang
Zhenxing Wu
Zhejiang University of Technology College of Mechanical Engineering
Author Profile
Xuedong Chen
Hefei General Machinery Research Institute
Author Profile
Zhichao Fan
Hefei General Machinery Research Institute
Author Profile
Yu Zhou
Hefei General Machinery Research Institute
Author Profile
Jinwen Yu
Weichai Power Co Ltd
Author Profile
Heng Jiang
Hefei General Machinery Research Institute
Author Profile

Abstract

Isothermal low cycle fatigue tests for a ductile cast iron QTRSi4Mo1 were carried out at 500°C and 760°C. The results showed that it exhibited initial cyclic hardening followed by saturation at 500°C, while gradual cyclic softening occurred at 760°C due to a more pronounced creep effect. A damage-coupled unified viscoplastic constitutive model incorporating two nonlinear and one linear strain range-dependent drag stress components was developed, for modeling the distinct strain range-dependent deformation behaviors at different temperatures. In the model, a modified damage evolution law was introduced. Furthermore, the parameter identification approach for the unified viscoplastic model was proposed, including the initial estimates combined with the genetic algorithm-based global optimization procedure. The proposed model can simulate the strain range-dependent cyclic deformation behaviors and predict the LCF failure life of the investigated material.

Peer review status:UNDER REVIEW

19 Apr 2021Submitted to Fatigue & Fracture of Engineering Materials & Structures
19 Apr 2021Assigned to Editor
19 Apr 2021Submission Checks Completed
20 Apr 2021Reviewer(s) Assigned