Using the Finite Element Method, 3 Dimensional FE Analysis of Residual Stress by Cold Expansion Method in the Plate Baying Adjacent Holes

2006 ◽  
Vol 30 (5) ◽  
pp. 528-532
Author(s):  
Won-Ho Yang ◽  
Myoung-Rae Cho ◽  
Jae-Soon Jang
Keyword(s):  
Finite Element Method ◽  
Residual Stress ◽  
Finite Element ◽  
Expansion Method ◽  
Fe Analysis ◽  
The Finite Element Method ◽  
Cold Expansion ◽  
3 Dimensional ◽  
Element Method

scholarly journals Cold Expansion Process with Multiple Balls—Numerical Simulation and Comparison with Single Ball and Tapered Mandrels

Materials ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 5536
Author(s):  
David Curto-Cárdenas ◽  
Jose Calaf-Chica ◽  
Pedro Miguel Bravo Díez ◽  
Mónica Preciado Calzada ◽  
Maria-Jose Garcia-Tarrago
Keyword(s):  
Numerical Simulation ◽  
Finite Element Method ◽  
Finite Element ◽  
Fatigue Life ◽  
Experimental Tests ◽  
The Finite Element Method ◽  
Expansion Process ◽  
Cold Expansion ◽  
Hoop Stresses ◽  
Element Method

Cold expansion technology is an extended method used in aeronautics to increase fatigue life of holes and hence extending inspection intervals. During the cold expansion process, a mechanical mandrel is forced to pass along the hole generating compressive residual hoop stresses. The most widely accepted geometry for this mandrel is the tapered one and simpler options like balls have generally been rejected based on the non-conforming residual hoop stresses derived from their use. In this investigation a novelty process using multiple balls with incremental interference, instead of a single one, was simulated. Experimental tests were performed to validate the finite element method (FEM) models and residual hoop stresses from multiple balls simulation were compared with one ball and tapered mandrel simulations. Results showed that the use of three incremental balls significantly reduced the magnitude of non-conforming residual hoop stresses and the extension of these detrimental zone.

Generalized Polynomial Expansion Method for the Dynamic Analysis of Rotor-Bearing Systems

1991 ◽  
Author(s):  
Ting Nung Shiau ◽  
Jon Li Hwang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Expansion Method ◽  
Polynomial Expansion ◽  
The Finite Element Method ◽  
Rotor Systems ◽  
Generalized Polynomial ◽  
Rotor Bearing ◽  
Polynomial Expansion Method ◽  
Element Method

The determination of critical speeds and modes and the unbalance response of rotor-bearing systems is investigated with the application of a technique called the generalized polynomial expansion method (GPEM). This method can be applied to both linear and nonlinear rotor systems, however, only linear systems are addressed in this paper. Three examples including single spool and dual rotor systems are used to demonstrate the efficiency and the accuracy of this method. The results indicate a very good agreement between the present method and the finite element method (FEM). In addition, computing time will be saved using this method in comparison with the finite element method.

Prediction of Tablet Characteristics from Residual Stress Distribution Estimated by the Finite Element Method

2013 ◽  
Vol 102 (10) ◽  
pp. 3678-3686 ◽  
Author(s):  
Yoshihiro Hayashi ◽  
Takahiro Miura ◽  
Takuya Shimada ◽  
Yoshinori Onuki ◽  
Yasuko Obata ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Residual Stress ◽  
Finite Element ◽  
Stress Distribution ◽  
Residual Stress Distribution ◽  
The Finite Element Method ◽  
Element Method

Generalized Polynomial Expansion Method for the Dynamic Analysis of Rotor-Bearing Systems

1993 ◽  
Vol 115 (2) ◽  
pp. 209-217 ◽  
Author(s):  
T. N. Shiau ◽  
J. L. Hwang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Expansion Method ◽  
Polynomial Expansion ◽  
The Finite Element Method ◽  
Rotor Systems ◽  
Generalized Polynomial ◽  
Rotor Bearing ◽  
Polynomial Expansion Method ◽  
Element Method

The determination of critical speeds and modes and the unbalance response of rotor-bearing systems is investigated with the application of a technique called the generalized polynomial expansion method (GPEM). This method can be applied to both linear and nonlinear rotor systems; however, only linear systems are addressed in this paper. Three examples including single spool and dual rotor systems are used to demonstrate the efficiency and the accuracy of this method. The results indicate a very good agreement between the present method and the finite element method (FEM). In addition, computing time will be saved using this method in comparison with the finite element method.

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