FEM Analysis of the SIF in Rotating Shafts Containing Breathing Elliptical Cracks

2015 ◽  
pp. 323-333
Author(s):  
Patricia Rubio ◽  
Belén Muñoz-Abella ◽  
Lourdes Rubio
Keyword(s):  
Fem Analysis ◽  
Rotating Shafts ◽  
Elliptical Cracks

Vibration Analysis of Rotor for Crack Identification

2002 ◽  
Vol 8 (1) ◽  
pp. 51-67 ◽  
Author(s):  
P. N. Saavedra ◽  
L. A. Cuitiño
Keyword(s):  
Crack Detection ◽  
Equations Of Motion ◽  
Fem Analysis ◽  
Computational Effort ◽  
Crack Identification ◽  
Crack Model ◽  
Excited System ◽  
Closing Crack ◽  
Stationary Vibration ◽  
Rotating Shafts

A theoretical and experimental dynamic analysis of a rotor-bearing system with a transversely cracked shaft is presented. To model the system for FEM analysis, a finite element for a cracked cylindrical shaft is developed. The additional flexibility due to the crack is evaluated from the linear fracture mechanics, using a breathing crack model derived in a rigorous way. A simplified opening/closing crack model is proposed to reduce the computational effort. The resulting parametrically excited system is nonlinear, and the equations of motion are solved using Hilbert, Hughes, and Taylor integration method (HHT) implemented in Matlab platform, where the stationary vibration caused by gravity and unbalance is analyzed. The results show that for half the first critical speed, the super-harmonic 2 ×Ω and the typical orbit provide good indices for crack detection in rotating shafts.

FEM ANALYSIS FOR A NOVEL CONFIGURATION OF BRUSHLESS DC MOTOR WITHOUT PERMANENT MAGNET

2009 ◽  
Vol PIER 98 ◽  
pp. 407-423 ◽  
Author(s):  
Hassan Moradi ◽  
Ebrahim Afjei ◽  
Faramarz Faghihi
Keyword(s):  
Permanent Magnet ◽  
Fem Analysis ◽  
Dc Motor ◽  
Brushless Dc Motor ◽  
Brushless Dc

FEM Analysis of Bridge-Type Cable System

2001 ◽  
Vol 84 (9) ◽  
pp. 20-27 ◽  
Author(s):  
Aleš Nevařil ◽  
Jiří Kytýr
Keyword(s):  
Fem Analysis ◽  
Cable System ◽  
Bridge Type

FEM analysis of the inflation process of Magnetoplasma Sails

2017 ◽  
Vol 53 (2) ◽  
pp. 329-340 ◽  
Author(s):  
A. Alemany ◽  
R. Forcinetti ◽  
F. Masson ◽  
A. Montisci
Keyword(s):  
Fem Analysis

Bisynchronous Torsional Vibrations in Rotating Shafts

1987 ◽  
Vol 54 (4) ◽  
pp. 893-897 ◽  
Author(s):  
O. Bernasconi
Keyword(s):  
Angular Momentum ◽  
Nonlinear Term ◽  
Rotation Frequency ◽  
Longitudinal Component ◽  
Torsional Vibrations ◽  
Rotating Shaft ◽  
Rotating Shafts

In this study, the intrinsic behavior of rotating shafts with residual unbalance is considered. The longitudinal component of the angular momentum caused by synchronous precession (whirling) induces torsional vibrations with a frequency of twice the rotation frequency (bisynchronous). The nonlinear term which represents this coupling is characteristic of the asymmetrical aspect of rotating shaft kinematics. This result has been obtained analytically and confirmed experimentally.

scholarly journals Numerical Analysis of the Bond Strength between Two Methacrylic Polymers by Surface Modification

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 3927
Author(s):  
Joanna Taczała ◽  
Katarzyna Rak ◽  
Jacek Sawicki ◽  
Michał Krasowski
Keyword(s):  
Numerical Analysis ◽  
Bond Strength ◽  
Angular Position ◽  
Fem Analysis ◽  
Groove Depth ◽  
Chemical Reagent ◽  
Shear Process ◽  
3D Geometry ◽  
The Right ◽  
Artificial Teeth

The creation of acrylic dentures involves many stages. One of them is to prepare the surfaces of artificial teeth for connection with the denture plates. The teeth could be rubbed with a chemical reagent, the surface could be developed, or retention hooks could be created. Preparation of the surface is used to improve the bond between the teeth and the plate. Choosing the right combination affects the length of denture use. This work focuses on a numerical analysis of grooving. The purpose of this article is to select the shape and size of the grooves that would most affect the quality of the bond strength. Two types of grooves in different dimensional configurations were analyzed. The variables were groove depth and width, and the distance between the grooves. Finally, 24 configurations were obtained. Models were analyzed in terms of their angular position to the loading force. Finite element method (FEM) analysis was performed on the 3D geometry created, which consisted of two polymer bodies under the shear process. The smallest values of the stresses and strains were characterized by a sample with parallel grooves with the grooving dimensions width 0.20 mm, thickness 0.10 mm, and distance between the grooves 5.00 mm, placed at an angle of 90°. The best dimensions from the parallel (III) and cross (#) grooves were compared experimentally. Specimens with grooving III were not damaged in the shear test. The research shows that the shape of the groove affects the distribution of stresses and strains. Combining the selected method with an adequately selected chemical reagent can significantly increase the strength of the connection.

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