Nonlocal damage-viscoplastic model for high temperature creep of single crystal superalloys

PAMM ◽  
2011 ◽  
Vol 11 (1) ◽  
pp. 445-446
Author(s):  
Bach Tuyet Trinh ◽  
Klaus Hackl
Keyword(s):  
High Temperature ◽  
Single Crystal ◽  
High Temperature Creep ◽  
Nonlocal Damage ◽  
Viscoplastic Model ◽  
Temperature Creep

A Review of Rafting in Nickel-Based Single Crystal Superalloys

2017 ◽  
Vol 263 ◽  
pp. 41-49
Author(s):  
Zhi Yuan Yu ◽  
Zhu Feng Yue ◽  
Wei Cao ◽  
Xin Mei Wang
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Single Crystal ◽  
Numerical Simulations ◽  
Critical Review ◽  
High Temperature Creep ◽  
Major Work ◽  
Creep Properties ◽  
Temperature Creep ◽  
Directional Coarsening

Nickel-based single crystal superalloys have been widely used in modern aircraft, which is related to its high temperature mechanical strength and creep properties. And the initial cubic γ′ precipitates start to coarsen directionally during high temperature creep, which results in the degradation of the mechanical properties, especially the creep properties. Therefore, it is essential to figure out the mechanism of directional coarsening during the period of high temperature creep. In this article, a broad review of rafting mechanism of nickel-based single crystal superalloys is provided. The major work of this critical review is to introduce several experiments and numerical simulations which are used to analyze the evolution of rafting. For three different numerical simulations, their performance, advantage and disadvantage are discussed in detail. Through methods above, the effect on creep properties is summarized.

High Temperature Creep Damage Under Biaxial Loading—Part II: Model and Simulations

1990 ◽  
Vol 112 (4) ◽  
pp. 450-455 ◽  
Author(s):  
F. Trivaudey ◽  
P. Delobelle
Keyword(s):  
High Temperature ◽  
Biaxial Loading ◽  
Creep Damage ◽  
Internal Variables ◽  
Anisotropic Damage ◽  
High Temperature Creep ◽  
Viscoplastic Model ◽  
Temperature Creep ◽  
Complete Formulation ◽  
Damage Law

The inadequacies, in describing the high temperature creep damage of two industrial alloys (Part I) with a model where the anisotropic damage variable D depends only on time have been pointed out. It is therefore proposed to introduce directly strain rate in the damage law. This rule is then integrated into a unified viscoplastic model, with internal variables, that has been developed elsewhere. Some numerical simulations obtained with the complete formulation are reported and, in general, yield acceptable results.

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