Fatigue life prediction method for gas turbine rotor disk alloy FV535.

A new energy-based fatigue life prediction framework for calculation of axial and bending fatigue life at various stress ratios has been developed. The purpose of the life prediction framework is to account for materials used in gas turbine engines, such as Titanium 6Al-4V, which experience an endurance stress limit as the number of cycles increase towards infinity. The work conducted to develop this energy-based framework consist of the following entities: (1) A new life prediction criterion for axial and bending fatigue at various stress ratios for Aluminum 6061-T6, (2) use of the previously developed improved uniaxial energy-based method to acquire fatigue life prior to endurance limit behavior [1], (3) and the incorporation of a statistical energy-based fatigue life calculation scheme to the uniaxial life criterion (the first entity of the framework), which is capable of constructing prediction intervals based on a specified percent confidence level. The exactitude of this work was verified by comparison between theoretical approximations and experimental results from recently acquired Al 606-T6 and Ti 6Al-4V data. The comparison shows very good agreement, thus validating the capability of the framework to produce accurate fatigue life predictions.

Download Full-text

An Energy-Based Method for Uni-Axial Fatigue Life Calculation

Volume 6: Structures and Dynamics, Parts A and B ◽

10.1115/gt2009-59512 ◽

2009 ◽

Cited By ~ 8

Author(s):

Hakan Ozaltun ◽

Jeremy Seidt ◽

M.-H. Herman Shen ◽

Tommy George ◽

Charles Cross

Keyword(s):

Fatigue Life ◽

Gas Turbine ◽

Life Prediction ◽

Prediction Method ◽

Strain Curve ◽

Fatigue Life Prediction ◽

Cyclic Process ◽

Model Approximation ◽

Plastic Energy ◽

Remaining Fatigue Life

An energy based fatigue life prediction framework has been developed for calculation of remaining fatigue life of in-service gas turbine materials. The purpose of the life prediction framework is to account for the material aging effect on fatigue strength of gas turbine engines structural components which are usually designed for infinite life. Previous studies [1–7] indicate the total strain energy dissipated during a monotonic fracture process and a cyclic process is a material property that can be determined by measuring the area underneath the monotonic true stress-strain curve and the sum of the area within each hysteresis loop in the cyclic process, respectively. The energy-based fatigue life prediction framework consists of the following entities: (1) development of a testing procedure to achieve plastic energy dissipation per life cycle and (2) incorporation of an energy-based fatigue life calculation scheme to determine the remaining fatigue life of in-service gas turbine materials. The accuracy of the remaining fatigue life prediction method was verified by comparison between model approximation and experimental results of Aluminum 6061-T6 (Al 6061-T6). The comparison shows promising agreement, thus validating the capability of the framework to produce accurate fatigue life prediction.

Download Full-text

A multiaxial fatigue life prediction method for metallic material under combined random vibration loading and mean stress loading in the frequency domain

International Journal of Fatigue ◽

10.1016/j.ijfatigue.2021.106235 ◽

2021 ◽

pp. 106235

Author(s):

Daiyang Gao ◽

Weixing Yao ◽

Weidong Wen ◽

Jie Huang

Keyword(s):

Fatigue Life ◽

Frequency Domain ◽

Life Prediction ◽

Random Vibration ◽

Prediction Method ◽

Multiaxial Fatigue ◽

Fatigue Life Prediction ◽

Mean Stress ◽

Metallic Material ◽

Vibration Loading

Download Full-text

Life Prediction Method of CC and DS Ni Base Superalloys Under High Temperature Biaxial Fatigue Loading

Journal of Engineering for Gas Turbines and Power ◽

10.1115/1.4001085 ◽

2010 ◽

Vol 132 (11) ◽

Cited By ~ 5

Author(s):

Takashi Ogata

Keyword(s):

Fatigue Life ◽

Gas Turbine ◽

Turbine Blade ◽

Life Prediction ◽

Compressive Strain ◽

Prediction Method ◽

Strain Range ◽

Fatigue Loading ◽

Normal Strain ◽

Biaxial Fatigue

Polycrystalline conventional casting (CC) and directionally solidified (DS) Ni base superalloys are widely used as gas turbine blade materials. It was reported that the surface of a gas turbine blade is subjected to a biaxial tensile-compressive fatigue loading during a start-stop operation, based on finite element stress analysis results. It is necessary to establish the life prediction method of these superalloys under biaxial fatigue loading for reliable operations. In this study, the in-plane biaxial fatigue tests with different phases of x and y directional strain cycles were conducted on both CC and DS Ni base superalloys (IN738LC and GTD111DS) at high temperatures. The strain ratio ϕ was defined as the ratio between the x and y directional strains at 1/4 cycle and was varied from 1 to −1. In ϕ=1 and −1. The main cracks propagated in both the x and y directions in the CC superalloy. On the other hand, the main cracks of the DS superalloy propagated only in the x direction, indicating that the failure resistance in the solidified direction is weaker than that in the direction normal to the solidified direction. Although the biaxial fatigue life of the CC superalloy was correlated with the conventional Mises equivalent strain range, that of the DS superalloy depended on ϕ. The new biaxial fatigue life criterion, equivalent normal strain range for the DS superalloy was derived from the iso-fatigue life curve on a principal strain plane defined in this study. Fatigue life of the DS superalloy was correlated with the equivalent normal strain range. Fatigue life of the DS superalloy under equibiaxial fatigue loading was significantly reduced by introducing compressive strain hold dwell. Life prediction under equibiaxial fatigue loading with the compressive strain hold was successfully made by the nonlinear damage accumulation model. This suggests that the proposed method can be applied to life prediction of the gas turbine DS blades, which are subjected to biaxial fatigue loading during operation.

Download Full-text

The application of a statistical fatigue life prediction method to agricultural equipment

International Journal of Fatigue ◽

10.1016/0142-1123(87)90053-3 ◽

1987 ◽

Vol 9 (2) ◽

pp. 115-118 ◽

Cited By ~ 5

Author(s):

B HARRAL

Keyword(s):

Fatigue Life ◽

Life Prediction ◽

Prediction Method ◽

Fatigue Life Prediction ◽

Agricultural Equipment

Download Full-text

Fatigue Life Prediction of Buckling String with Cracks in Horizontal Wells of Mining Engineering

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.577.127 ◽

2012 ◽

Vol 577 ◽

pp. 127-131 ◽

Cited By ~ 1

Author(s):

Peng Wang ◽

Tie Yan ◽

Xue Liang Bi ◽

Shi Hui Sun

Keyword(s):

Fatigue Life ◽

Prediction Model ◽

Life Prediction ◽

Horizontal Well ◽

Drill Pipe ◽

Prediction Method ◽

Drill String ◽

Fatigue Life Prediction ◽

Mining Engineering ◽

Life Prediction Model

Fatigue damage in the rotating drill pipe in the horizontal well of mining engineering is usually resulted from cyclic bending stresses caused by the rotation of the pipe especially when it is passing through curved sections or horizontal sections. This paper studies fatigue life prediction method of rotating drill pipe which is considering initial crack in horizontal well of mining engineering. Forman fatigue life prediction model which considering stress ratio is used to predict drill string fatigue life and the corresponding software has been written. The program can be used to calculate the stress of down hole assembly, can predict stress and alternating load in the process of rotating-on bottom. Therefore, establishing buckling string fatigue life prediction model with cracks can be a good reference to both operation and monitor of the drill pipe for mining engineering.

Download Full-text