Multiaxial Stress-Strain Creep Analysis for Notches

2009 ◽  
pp. 230-230-14 ◽  
Author(s):  
AA Moftakhar ◽  
G Glinka ◽  
D Scarth ◽  
D Kawa
Keyword(s):  
Multiaxial Stress ◽  
Stress Strain ◽  
Creep Analysis

A Method for Direct Measurement of Multiaxial Stress-Strain Curves in Sheet Metal

2007 ◽  
Vol 38 (2) ◽  
pp. 306-313 ◽  
Author(s):  
T. Foecke ◽  
M.A. Iadicola ◽  
A. Lin ◽  
S.W. Banovic
Keyword(s):  
Sheet Metal ◽  
Direct Measurement ◽  
Multiaxial Stress ◽  
Stress Strain

Comparison of the Isochronous Method and a Time-Explicit Model for Creep Analysis

2008 ◽  
Author(s):  
William Koves ◽  
Mingxin Zhao
Keyword(s):  
Elevated Temperature ◽  
Large Scale ◽  
Time Dependent ◽  
Creep Model ◽  
Full Time ◽  
Pure Bending ◽  
Stress Strain ◽  
Creep Analysis ◽  
Generalized Time ◽  
Strain Method

The design of components or structures at elevated temperature is complex. The use of rigorous time dependent material models may not be practical for many large scale industrial problems. The use of simplified methods permits the creep analysis of components that would be impractical by rigorous time dependent models. The Isochronous Stress-Strain method is an approach that has been used extensively for the creep evaluation of elevated temperature components. The method has been used for the analysis of problems containing both primary and secondary stresses. The method has also been used to evaluate creep buckling problems. Although the method has been accepted as an alternative to a full time dependent creep analysis, the limitations and accuracy of the method have not been investigated systematically and are not fully understood. This study compares the isochronous stress-strain method with a generalized time-explicit creep model for materials in high temperature applications. Analytical solutions are developed for three basic loading configurations, including uniaxial tension, pure bending, and torsion in either load or displacement controlled conditions. Deformations, stresses, and creep strains are compared between the two different methods.

Multiaxial Stress-Strain Approximations for Notch Fatigue Behaviors

1977 ◽  
Vol 5 (2) ◽  
pp. 106 ◽  
Author(s):  
RL Meltzer ◽  
YR Fiorini ◽  
RT Horstman ◽  
IC Moore ◽  
AL Batik ◽  
...  
Keyword(s):  
Multiaxial Stress ◽  
Stress Strain

Fatigue Life Prediction of Notched Components Based on Multiaxial Local Stress-Strain Approach

2009 ◽  
Author(s):  
Baoxiang Qiu ◽  
Zengliang Gao ◽  
Xiaogui Wang
Keyword(s):  
Strain State ◽  
Notch Root ◽  
Constitutive Relations ◽  
Local Stress ◽  
Cyclic Plasticity ◽  
Multiaxial Stress ◽  
Stress Strain ◽  
Stress Strain State ◽  
Multiaxial Stress State ◽  
Notched Components

A multiaxial local stress-strain approach based on the Armstrong-Frederick type cyclic plasticity theory was proposed to perform the stress analysis and the fatigue analysis on the notched components. A robust cyclic plasticity model was adopted to describe the non-Masing behavior of 16MnR steel. The incremental form of the multiaxial local stress-strain approach was formulated with the incremental constitutive relations and the incremental Neuber’s rule. The multiaxial stress-strain state at the notch root of notched components subjected to proportional and nonproportional loading was predicted by the multiaxial approximate approach. On the basis of the multiaxial local stress-strain state and the Fatemi-Socie criterion, the fatigue lives of the notched components were predicted. The analytical results show that the proposed multiaxial local stress-strain method can describe the multiaxial stress state at the notch root very well, and the predicted fatigue lives correlate well with the experimental data.

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