PS32 Development of Accelerated Fretting Fatigue Testing Method By Using Ultrasonic Torsional Fatigue Testing Machine

2012 ◽  
Vol 2012 (0) ◽  
pp. _PS32-1_-_PS32-3_
Author(s):  
Hiroki MASUDA ◽  
Yoshinobu SHIMAMURA ◽  
Hitoshi ISHII ◽  
Keiichiro TOHGO ◽  
Tomoyuki FUJII ◽  
...  
Keyword(s):  
Fatigue Testing ◽  
Testing Machine ◽  
Fretting Fatigue ◽  
Testing Method ◽  
Torsional Fatigue

Fretting Fatigue Testing of Carburized Alloy Steel in Very High Cycle Regime Using an Ultrasonic Torsional Fatigue Testing Machine

2014 ◽  
Vol 891-892 ◽  
pp. 1152-1156
Author(s):  
Yoshinobu Shimamura ◽  
Akito Kokubo ◽  
Hitoshi Ishii ◽  
Keiichiro Tohgo ◽  
Tomoyuki Fujii ◽  
...  
Keyword(s):  
Fatigue Testing ◽  
Testing Machine ◽  
Fatigue Property ◽  
High Strength ◽  
Fretting Fatigue ◽  
Testing Method ◽  
Torsional Fatigue ◽  
Alloy Steels ◽  
Strength Alloy ◽  
Very High

Recently, high-strength alloy steels have been developed and used for various products. It is well known that fretting fatigue does not show fatigue limit. In other words, fretting fatigue failure may occur in very high cycle regime more than 107 cycles. However, it is difficult to investigate fretting fatigue property in very high cycle regime by using conventional fatigue testing machines because it is time-consuming. In this study, a fretting fatigue testing method for carburized alloy steels in very high cycle regime is explored by using an ultrasonic torsional fatigue testing machine. Carburized SCM420H was used for investigation. The experimental results showed that it is possible to conduct fretting fatigue testing of carburized alloy steels by using an ultrasonic torsional fatigue testing machine.

scholarly journals Fretting Fatigue Behaviour of Alloy Steel in the Very High Cycle Region

2019 ◽  
Vol 300 ◽  
pp. 18002
Author(s):  
Yoshinobu Shimamura ◽  
Reo Kasahara ◽  
Hitoshi Ishii ◽  
Keiichiro Tohgo ◽  
Tomoyuki Fujii ◽  
...  
Keyword(s):  
Fatigue Strength ◽  
Fatigue Testing ◽  
Testing Machine ◽  
Fatigue Behaviour ◽  
Fretting Fatigue ◽  
Fatigue Tests ◽  
Fatigue Properties ◽  
Test Results ◽  
Torsional Fatigue ◽  
Very High

It is well known that fretting fatigue strength is much lower than the fatigue strength of smooth specimens and the fatigue limit disappears. Many studies on fretting fatigue have been reported but most of the studies have not cover fatigue properties in the very high cycle regime more than 107 cycles. In this study, an accelerated fretting fatigue testing method was developed by using an ultrasonic torsional fatigue testing machine with a clamping fretting pad. Fretting fatigue tests of CrMo steel were conducted by using the developed method. Test results showed that fretting fatigue failure occurs in the very high cycle region.

A Modeling Approach to Predict Fretting Fatigue on Highly Loaded Blade Roots

2009 ◽  
Author(s):  
Patrick Wackers ◽  
Victor Arrieta ◽  
Marcel Alquezar-Getan ◽  
Andrei Constantinescu ◽  
Habibou Maitournam
Keyword(s):  
Prediction Models ◽  
Fatigue Testing ◽  
Testing Machine ◽  
Estimation Procedure ◽  
Fretting Fatigue ◽  
Test Machine ◽  
Operational Conditions ◽  
Number Of Cycles ◽  
Failure Location ◽  
Highly Loaded

A lifing technique for predicting fretting fatigue on highly loaded blade-disk attachments has been developed and calibrated. The approach combines extensive testing on nickel and titanium based alloys using a specially devised multiaxial fretting test machine and an analytical lifing procedure based on finite element contact calculations and multiaxial shakedown fatigue models. In order to reproduce realistic operational conditions and standardize testing conditions a special fretting fatigue testing machine with high temperature testing capabilities was developed. The machine was employed to perform systematic testing under prescribed load and displacement conditions at representative temperatures. Making use of FEA the rig test results were calculated to identify relevant parameters such as friction coefficient, slip conditions and machine compliance. The computation procedure involves the calculation of several major loading cycles until a stabilized response of the structure is achieved. The material response is assumed to be elasto-plastic and a nonlinear friction law (space and time) was applied. From the computed mechanical variables, a several life prediction models are benchmarked to establish their capabilities to predict fretting-fatigue life. Finally, a most promising life estimation procedure was applied to predict life in a real compressor blade-disk attachment. Predicted failure location and number of cycles to failure are compared against engine tests results. The experimental-analytical approach has the potential to predict fretting fatigue risk during the design phase on highly loaded joints as well as estimating the preventive overhaul intervals for parts already in service.

scholarly journals Some aspects of fretting fatigue under cyclic normal loading

2019 ◽  
Vol 1 (1) ◽  
Author(s):  
Farshad Abbasi ◽  
G. H. Majzoobi
Keyword(s):  
Fatigue Life ◽  
Fatigue Testing ◽  
Normal Load ◽  
Testing Machine ◽  
Low Frequency ◽  
Load Condition ◽  
Fretting Fatigue ◽  
Normal Loading ◽  
Drastic Effect ◽  
Fretting Damage

Fretting fatigue has been studied mainly under constant normal loading, as it requires simple equipment which can be assembled on a universal fatigue testing machine. Recently, we [1] have introduced an innovative fretting fatigue apparatus in which the contact pressure can independently be varied during the test. In a recent publication [2] we have investigated the effect of normal load frequency on fretting fatigue life of Al7075-T6 under cyclic normal load condition. It was found that the low frequency of normal load has drastic effect on fretting fatigue life. The effect, however, gradually diminishes with the frequency increase and vanishes at the frequency of around 80Hz. In another publication [3] we have compared the results of constant normal loading with those of in phase, 90° and 180° degrees out-of-phase loadings. It was found that the constant normal loading has the least fretting damage, while the maximum fretting damage occurs by in-phase loading. The results also showed that the out-of-phase loading had improving effect on fretting fatigue life with respect to the in-phase condition. Recently, Ciaverella [4] has published a discussion on our publications [2, 3]. He believes that some of our experimental results needs further discussion. Therefore, the objective of this article is to answer three main points he has raised in his article [4]. We hope that this discussion could lead to some progress.

scholarly journals Design of Fretting Fatigue Testing Machine

2016 ◽  
Vol V5 (05) ◽  
Author(s):  
Abhijeet T. Pokarnekar ◽  
Mr. N. L. Soni ◽  
Mr M. V. Kavade ◽  
Keyword(s):  
Fatigue Testing ◽  
Testing Machine ◽  
Fretting Fatigue

scholarly journals Fatigue crack initiation and propagation of 100Cr6 steel under torsional loading in very high cycle regime

2018 ◽  
Vol 165 ◽  
pp. 20003
Author(s):  
Hongqian Xue ◽  
Tao Gao ◽  
Zhidan Sun ◽  
Xianjie Zhang
Keyword(s):  
Fatigue Crack ◽  
Crack Initiation ◽  
Fatigue Testing ◽  
Fatigue Cracks ◽  
Maximum Shear Stress ◽  
Testing Machine ◽  
Fatigue Crack Initiation ◽  
Longitudinal Direction ◽  
Torsional Fatigue ◽  
Very High

Cyclic torsional fatigue properties of a high strength steel 100Cr6 are investigated using an ultrasonic torsional fatigue testing machine, and the results are compared with those obtained with fatigue tests under axial loading. Fatigue crack initiation and growth under torsion loading are observed in the very high cycle regime. Results show that fatigue cracks initiated from specimen surface as well as subsurface inclusions under torsion loading. However, subsurface MnS inclusions play a dominant role in crack initiation under torsion loading in the very high cycle regime. The initiation and early propagation of fatigue cracks are mostly controlled by the direction of the maximum shear stress. For surface crack initiation, cracks initiated in parallel to the longitudinal direction of the specimens. Once the shear crack propagated to a crack length of about 20-30 μm, crack branched to the angle close to the direction perpendicular to the remote maximum principal stresses. As for the subsurface fatigue crack initiation, the cracks parallel to the longitudinal direction of the specimens could not be observed, and crack propagation followed a spiral shape on a plane with an orientation of 45° with respect to the loading direction, which corresponds to the maximum principal stress plane.

Experimental and Numerical Investigation of Circular Arc Dovetail Attachments under Fatigue Loading

2014 ◽  
Vol 541-542 ◽  
pp. 564-568
Author(s):  
Liang Shi ◽  
Da Sheng Wei ◽  
Yan Rong Wang
Keyword(s):  
Stress Distribution ◽  
Fatigue Testing ◽  
Testing Machine ◽  
Bending Moment ◽  
Fatigue Loading ◽  
Fretting Fatigue ◽  
Circular Arc ◽  
Fan Blade ◽  
Number Of Cycles ◽  
Actual Geometry

Fretting fatigue is an important failure mode of dovetail attachments in gas turbine engines. One of the most difficult challenges in carrying out experiments of components with actual geometry is the design of fixtures for the dovetail attachments since it can change the stress distribution under a given load. A circular arc dovetail attachment specimen with a tenon at each end respectively was designed and machined to simulate the fatigue damage that occurs in wide-chord fan blade attachments, so it can perform two dovetail attachment simulations at each time, and its related fixture was connected with the testing machine by two pins which were orthogonal to each other so as to eliminate additional bending moment. An Instron 8802 servo-hydraulic fatigue testing system was used to provide fatigue loads. Furthermore, Finite Element (FE) analysis based on the experimental configuration was carried out to obtain the stress distribution on the contact surface, crack initiation location and number of cycles to the fretting fatigue failure were predicted based on the FE results. The results show a good agreement with the experimental counterparts.

Sign in / Sign up

Export Citation Format

Share Document