The Effects of a Transverse Crack on the Dynamics of a Circular Shaft

1992 ◽  
pp. 59-67 ◽  
Author(s):  
P. S. Leung
Keyword(s):  
Transverse Crack ◽  
Circular Shaft

Estimation of the severity of damage produced by a transverse crack

2020 ◽  
Vol 65 (1) ◽  
pp. 137-144
Author(s):  
Marius-Vasile Pop
Keyword(s):  
Transverse Crack ◽  
Bending Moment ◽  
Cantilever Beams ◽  
Trend Line ◽  
The Real ◽  
Symmetrical Deformation ◽  
Frequency Drop ◽  
Equidistant Points ◽  
Fixed End ◽  
Crack Position

This paper presents a method to find the severity of a crack for cantilever beams that can be used to estimate the frequency drop due to the crack. The severity is found for the crack located at the location where the biggest curvature (or bending moment) is achieved. Because the fixing condition does not permit a symmetrical deformation around the crack, the apparent severity is smaller as the real one. The latter is found by the estimated value of the trend-line at the fixed end, it being constructed on points that consider the crack position (equidistant points in the proximity of the fixed end) and the resulted deflections.

scholarly journals Evaluation of Transverse Crack Initiation in Cross-Ply CFRP Laminates under Fatigue Loading

2011 ◽  
Vol 77 (779) ◽  
pp. 1123-1134 ◽  
Author(s):  
Keigo TAKAMURA ◽  
Atsushi HOSOI ◽  
Narumichi SATO ◽  
Hiroyuki KAWADA
Keyword(s):  
Crack Initiation ◽  
Transverse Crack ◽  
Fatigue Loading ◽  
Cfrp Laminates

Delamination originating from transverse crack tips in laminates under mechanical loadings

1999 ◽  
Vol 8 (2) ◽  
pp. 153-165
Author(s):  
Kyohei Kondo ◽  
Keishiro Yoshida ◽  
Kazuhiro Yagi
Keyword(s):  
Transverse Crack ◽  
Crack Tips

Vibration And Stability Of A Rotating Shaft Containing A Transverse Crack

1993 ◽  
Vol 162 (3) ◽  
pp. 387-401 ◽  
Author(s):  
S.C. Huang ◽  
Y.M. Huang ◽  
S.M. Shieh
Keyword(s):  
Transverse Crack ◽  
Rotating Shaft

Experimental Study on Lateral and Torsional Vibration of Cracked Rotor With Torsional Excitation

2013 ◽  
Author(s):  
Chao Liu ◽  
Dongxiang Jiang
Keyword(s):  
Experimental Study ◽  
Normal Condition ◽  
Torsional Vibration ◽  
Transverse Crack ◽  
Rotating Machinery ◽  
Lateral Vibration ◽  
Cracked Rotor ◽  
Diagnostic Features ◽  
Slant Crack ◽  
Torsional Excitation

Crack failures in rotating machinery can result in catastrophic accidents, and they are are difficult to detect online. Condition monitoring is widely applied in field to detect changes of vibration, and form diagnostic features. However, effective features in vibration of the cracked rotor need more tests, especially validating the features with experiments. This work carried out an experimental study on cracked rotors in laboratory. The experiments are as following: (I) vibration of the rotor in normal condition is firstly tested, where lateral vibration and torsional vibration are measured; (II) torsional excitation is exerted on driven end of rotor system, and vibration characteristics of the rotor are tested; (III) cracked rotors are tested with transverse and slant cracks, respectively. With the measured signals, comparisons of vibrations in normal rotor and cracked rotors are carried out. The results show that, the transverse crack introduces more significant changes in 1X frequency and coupled frequency, while the slant crack employs larger changes in 2X frequency. And variation of phases of 1X frequency is presented. Also, the crack plays an impact on the torsional responses.

Torsion of a Circular Shaft With a Number of Longitudinal Notches

1950 ◽  
Vol 17 (4) ◽  
pp. 359-362
Author(s):  
H. Ōkubo
Keyword(s):  
Numerical Calculations ◽  
Torsion Problem ◽  
Elementary Functions ◽  
Circular Shaft

Abstract The object of this paper is to find a solution for the torsion problem of a circular shaft with a number of longitudinal semicircular notches. By using elementary functions the author has been able to simplify the numerical calculations in contrast to previous work in similar cases by other writers.

A three-dimensional numerical model for delaminations, transverse crack or debonding in composite sandwich plates with piezoelectric sensors

2021 ◽  
pp. 1045389X2110386
Author(s):  
Yaogang Wu ◽  
Zhengguang Xiao ◽  
Kangwei Liu ◽  
Dinghe Li
Keyword(s):  
Transverse Crack ◽  
Three Dimensional ◽  
Piezoelectric Sensor ◽  
Internal Force ◽  
Piezoelectric Sensors ◽  
Sandwich Plates ◽  
Composite Sandwich ◽  
Finite Element Software ◽  
Solid Element ◽  
Composite Sandwich Plates

An Extended Layerwise/Solid-Element (XLW/SE) method is developed based on the Extended Layerwise method (XLWM) and eight-node solid element method for the static analysis of damaged composite sandwich structures with piezoelectric sensor. In this method, the XLWM is used to model the facesheets and piezoelectric sensors, and the eight-node solid element is used for the lattice. Based on the equilibrium conditions of displacement and internal force of the overlapped joints at the facesheet/sensors and facesheet/lattice interfaces, the general governing equation is established. In the numerical examples, the proposed method is verified by comparing with the 3D elasticity model developed in the commercial finite element software, and composite sandwich plates with delamination and/or transverse crack and/or debonding are analyzed.

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