A united tension/compression asymmetry micro-mechanical model for nickel-base single-crystal alloys

2019 ◽  
Vol 26 (6) ◽  
pp. 621-630
Author(s):  
Jian-feng Xiao ◽  
Hai-tao Cui ◽  
Hong-jian Zhang ◽  
Wei-dong Wen
Keyword(s):  
Single Crystal ◽  
Mechanical Model ◽  
Nickel Base ◽  
Tension Compression Asymmetry

scholarly journals Modelling of TMF Crack Initiation in Smooth Single-Crystal Superalloy Specimens

2014 ◽  
Vol 891-892 ◽  
pp. 1283-1288 ◽  
Author(s):  
Daniel Leidermark ◽  
Mikael Segersäll ◽  
Johan Moverare ◽  
Kjell Simonsson
Keyword(s):  
Stress Relaxation ◽  
Crack Initiation ◽  
Single Crystal ◽  
Fatigue Behaviour ◽  
Creep Model ◽  
Critical Plane ◽  
Critical Plane Approach ◽  
Nickel Base ◽  
As Stress ◽  
Tension Compression Asymmetry

In this paper the TMF crack initiation behaviour of the single-crystal nickel-base superalloyMD2 is investigated and modelled. TMF tests were performed in both IP and OP for varying mechanicalstrain ranges in the [001] crystallographic direction until TMF crack initiation was obtained. Acrystal plasticity-creep model was used in conjunction with a critical-plane approach, to evaluate thenumber of cycles to TMF crack initiation. The critical-plane model was evaluated and calibrated ata stable TMF cycle, where the effect of the stress relaxation had attenuated. This calibrated criticalplanemodel is able to describe the TMF crack initiation, taking tension/compression asymmetry aswell as stress relaxation anisotropy into account, with good correlation to the real fatigue behaviour.

A New Approach for Single Crystal Materials Analysis: Theory and Application to Initial Yielding

2005 ◽  
Vol 127 (1) ◽  
pp. 119-129 ◽  
Author(s):  
G. Bande ◽  
J. A. Nemes
Keyword(s):  
Single Crystal ◽  
Material Behavior ◽  
Combined Approach ◽  
Global State ◽  
New Approach ◽  
Materials Analysis ◽  
Analysis Theory ◽  
Nickel Base ◽  
Tension Compression Asymmetry

A new approach used for single crystal (SC) materials analysis is described. Its principle is based on the extension of predictive models for isotropic material behavior to anisotropic materials such as SC nickel base superalloys. A viscoplastic model describes the material in the macroscopic level while a factor, based on the crystallographic approach, accounts for the global state of micro slip on the crystal. The combination of both elements defines the so-called “combined approach” (CA). This paper presents the development of the theory and its applications to the determination of initial yielding and tension–compression asymmetry.

The Effect of Tensile Stress on Oxidation Behavior of Nickel-Base Single Crystal Superalloy

2021 ◽  
pp. 109737
Author(s):  
Hai-Qing Pei ◽  
Meng Li ◽  
Ping Wang ◽  
Xiao-Hu Yao ◽  
Zhi-Xun Wen ◽  
...  
Keyword(s):  
Tensile Stress ◽  
Single Crystal ◽  
Oxidation Behavior ◽  
Single Crystal Superalloy ◽  
Nickel Base
Sign in / Sign up

Export Citation Format

Share Document