Characterization of the cavity nucleation factor for life prediction under creep-fatigue interaction

1996 ◽  
Vol 31 (18) ◽  
pp. 4957-4966 ◽  
Author(s):  
Baig Gyu Choi ◽  
Soo Woo Nam ◽  
Young Cheol Yoon ◽  
Joong Jae Kim
Keyword(s):  
Life Prediction ◽  
Cavity Nucleation ◽  
Creep Fatigue

scholarly journals Life Prediction Method Under Creep-Fatigue Loading for Gas Turbine Combustion Transition Piece of Ni-Based Superalloy N263

1997 ◽  
Author(s):  
J. Kusumoto ◽  
H. Watanabe ◽  
A. Kanaya ◽  
K. Ichikawa ◽  
S. Sakurai
Keyword(s):  
Crack Length ◽  
Surface Crack ◽  
Life Prediction ◽  
Prediction Method ◽  
Fatigue Loading ◽  
Maximum Surface ◽  
Creep Fatigue ◽  
Loading Tests ◽  
Transition Piece ◽  
Life Fraction

In order to develop the life prediction method under creep-fatigue loading for gas turbine combustion transition piece, creep-fatigue tests were carried out on both as-received and aged Ni-based superalloy Nimonic 263. Crack initiation and propagation behaviors for the smooth specimen were observed. An unique relationship was obtained between life fraction and the maximum surface crack length under triangular wave shape loading tests, except the results for the trapezoidal wave loading tests. The latter results were due to the over estimation of the surface crack length at the crack initiation. These were caused from an oxide film break during straining. In the case of removing the oxide film before the measurement of surface crack, the relationship between life fraction and the maximum surface crack length obtained as unique relationship regardless of triangular and trapezoidal strain wave shapes. Using the life prediction method proposed, which is based on maximum surface crack length, the damage of combustion transition piece materials in service was evaluated.

On the Development of Physically Based Life Prediction Models in the Thermo Mechanical Fatigue of Ni-Base Superalloys

2011 ◽  
Vol 465 ◽  
pp. 47-54 ◽  
Author(s):  
Stephen D. Antolovich ◽  
Robert L. Amaro ◽  
Richard W. Neu ◽  
A Staroselsky
Keyword(s):  
High Temperature ◽  
Damage Evolution ◽  
Life Prediction ◽  
Prediction Models ◽  
High Temperature Fatigue ◽  
Mechanical Fatigue ◽  
Use Of Resources ◽  
Physically Based ◽  
Creep Fatigue ◽  
Materials Used

In a world increasingly concerned with environmental factors and efficient use of resources, increasing operating temperatures of high temperature machinery can play an important role in meeting these goals. In addition, the cost of failure of such devices is rapidly becoming prohibitive. For example, in an airline crash airframe and engine manufacturers are, on average, held liable for 1,000,000 euros per fatality excluding the loss of property. Thus there is considerable pressure to make machinery that can operate much more safely at high temperatures. This means that the old ways of guarding against high temperature fatigue failure (e.g. factor of safety, S/N curves, creep life) are no longer acceptable; more reliable, accurate, and efficient means are needed to manage life, durability and risk. In this paper, high temperature fatigue is considered in terms of past successes and current challenges. Particular emphasis is placed on understanding damage mechanisms and their interactions both in terms of scientific interest and technological importance. Materials used in nuclear reactors (e.g. selected steels and solid solution Ni-base alloys) and in hot sections of jet engines (e.g. superalloys) are used as vehicles to illustrate damage evolution and interaction. Phenomenological life prediction models are presented and compared with physics-based damage evolution/interaction models which are based on observed physical processes such as creep/fatigue/environment interactions. It is shown that in many cases, in spite of the emphasis on creep-fatigue interactions, the most damaging forms of damage that occur under thermo-mechanical fatigue (TMF) loading result from the interaction of slip bands with oxidized boundaries.

Life Prediction Under Creep-Fatigue Condition for 1Cr-Mo-V Steel

1987 ◽  
pp. 234-239
Author(s):  
Koichi Yagi ◽  
Kiyoshi Kubo ◽  
Osamu Kanemaru ◽  
Toshio Ohba ◽  
Chiaki Tanaka
Keyword(s):  
Life Prediction ◽  
Creep Fatigue

Analysis on stress‐strain behavior and life prediction of P92 steel under creep‐fatigue interaction conditions

2020 ◽  
Vol 43 (11) ◽  
pp. 2731-2743
Author(s):  
Lei Zhao ◽  
Lianyong Xu ◽  
Yongdian Han ◽  
Hongyang Jing
Keyword(s):  
Life Prediction ◽  
Stress Strain ◽  
P92 Steel ◽  
Strain Behavior ◽  
Creep Fatigue

An Interpretation of Axial Creep-Fatigue Damage Interaction in Type 316 Stainless Steel (Survey Paper)

1990 ◽  
Vol 112 (1) ◽  
pp. 4-19 ◽  
Author(s):  
S. Y. Zamrik
Keyword(s):  
Life Prediction ◽  
Dwell Time ◽  
Austenitic Steels ◽  
Relaxation Data ◽  
Damage Mechanisms ◽  
Survey Paper ◽  
Long Period ◽  
Strain Limit ◽  
Creep Fatigue ◽  
Summation Rule

Creep-fatigue interaction and its effect on damage of components in service have been a major concern to analysts. To deal with this problem, several criteria have been proposed and used, such as: cycle-time fraction summation rule, strain limit, fracture maps where damage mechanisms are based on crack initiation or propagation, and ductility exhaustion. These concepts are reviewed in this paper so that one can interpret the damage mechanisms caused by creep and by fatigue. If a long period of dwell-time at elevated temperature is imposed on a component under strain conditions, stress relaxation occurs. Relaxation data can be used, for example, in austenitic steels, in predicting creep stages; however, interpretation of data obtained from such tests could be misleading in assessing damage. An example is given for life prediction on the basis of two selected criteria: the fraction rule and ductility exhaustion.

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