scholarly journals Microscopic Damage Process in Notched Specimen under Creep-Fatigue Condition Using High-Temperature Fatigue Testing Machine Combined with SEM.

1997 ◽  
Vol 46 (5) ◽  
pp. 506-511
Author(s):  
Masayuki ARAI ◽  
Takashi OGATA
Keyword(s):  
High Temperature ◽  
Fatigue Testing ◽  
Testing Machine ◽  
Notched Specimen ◽  
High Temperature Fatigue ◽  
Creep Fatigue ◽  
Damage Process ◽  
Microscopic Damage

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.

scholarly journals On New Axial Fatigue Testing Machine for High Temperature Tests

1959 ◽  
Vol 8 (68) ◽  
pp. 415-418
Author(s):  
Minoru KAWAMOTO ◽  
Tsuneshichi TANAKA ◽  
Yoshimasa MIKI
Keyword(s):  
High Temperature ◽  
Fatigue Testing ◽  
Testing Machine ◽  
Axial Fatigue

scholarly journals On New Fatigue Testing Machine for Combined Tension and Bending at High Temperature

1956 ◽  
Vol 5 (34) ◽  
pp. 410-414
Author(s):  
Toshio NISHIHARA ◽  
Shuji TAIRA ◽  
Kichinosuke TANAKA ◽  
Yojiro MURATA
Keyword(s):  
High Temperature ◽  
Fatigue Testing ◽  
Testing Machine

scholarly journals A Novel Method for High Temperature Fatigue Testing of Nickel Superalloy Turbine Blades with Additional NDT Diagnostics

Materials ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1392
Author(s):  
Dominik Kukla ◽  
Mateusz Kopec ◽  
Ryszard Sitek ◽  
Aleksander Olejnik ◽  
Stanisław Kachel ◽  
...  
Keyword(s):  
Finite Element ◽  
High Temperature ◽  
Fatigue Testing ◽  
Turbine Blades ◽  
Nickel Superalloy ◽  
Fe Model ◽  
Destructive Testing ◽  
High Temperature Fatigue ◽  
Bending Load ◽  
Novel Method

In this paper, a novel method for high temperature fatigue strength assessment of nickel superalloy turbine blades after operation at different times (303 and 473 h) was presented. The studies included destructive testing (fatigue testing at temperature 950 °C under cyclic bending load), non-destructive testing (Fluorescent Penetrant Inspection and Eddy Current method), and finite element modelling. High temperature fatigue tests were performed within load range from 5200 to 6600 N using a special self-designed blade grip attached to the conventional testing machine. The experimental results were compared with the finite element model generated from the ANSYS software. It was found that failure of turbine blades occurred in the area with the highest stress concertation, which was accurately predicted by the finite element (FE) model.

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