Dynamics of Cracked Composite Shafts

Sekhar, A. S.; Srinivas, B.N.

doi:10.1177/073168403029358

Cited by 8 publications

(6 citation statements)

References 16 publications

(17 reference statements)

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“…[10][11][12][13][14] Alwan et al 15 studied the dynamic response of glass/ epoxy, carbon/epoxy, and boron/epoxy composite shafts using experimental and numerical approaches. Sekhar and Srinivas 16 reported that fiber angle, lay-up sequence, crack parameters, and material properties have significant effect on the vibrational performance of composite shafts. Abu Talib et al 17 conducted a finite element (FE) analysis on composite shaft consisting glass/epoxy and carbon/epoxy layers.…”

Section: Introductionmentioning

confidence: 99%

Finite element analysis of functionally hybridized carbon/glass composite shafts

Sevkat

2014

Journal of Reinforced Plastics and Composites

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External torque on circular composite shafts produces linearly decreasing shear stresses along radial direction. The inner layers never stressed as much as outmost layer. Accommodating fiber stiffness of each layer based on these linearly decreasing stresses may be advantageous. To reduce the cost of carbon fiber-reinforced composite drive shaft, inner layers of shaft can be reinforced by hybrid fiber systems with less stiffness. To achieve that, while the top layer is still reinforced with carbon fiber, inner layers can be reinforced with the mixture of glass and carbon fiber. Without changing the fiber volume fractions, replacement of some carbon fiber with glass fiber will reduce the overall stiffness of fiber system. Mixture ratio or hybrid ratio can be calculated using linearly decreasing stress levels and the rule of mixture. These hybrid composite shafts can be manufactured by filament winding technique. During filament winding, composite shafts are wound layer by layer and filament type can be changed between the layers. The proper mixing ratio can be achieved by arranging the fiber count in each filament bundle. The relation between geometrical parameters and hybrid fiber volume fractions of composite shaft was derived. Finite element analysis on carbon fiber and functionally hybridized glass/carbon fiber shafts with same geometry was conducted. Stress, strain, and moment behavior of both shafts were compared. The possible advantages and disadvantages of hybridization were discussed.

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Section: Introductionmentioning

confidence: 99%

Finite element analysis of functionally hybridized carbon/glass composite shafts

Sevkat

2014

Journal of Reinforced Plastics and Composites

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“…Finally, the authors recommended that the measurement of mechanical impedance can be used as a good indicator for the presence of cracks. Sekhar and Srinivas (2003) used shell elements with 4 nodes using CQUAD4 elements available in commercial finite element analysis software NASTRAN and FEMAP to model hollow cracked composite shafts, fabricated using stacking sequences of boron-epoxy, carbon-epoxy and graphite-epoxy materials. The finite element formulation was based on first order shear deformation theory.…”

Section: Introductionmentioning

confidence: 99%

Crack Detection in Shafts Using Mechanical Impedance Measurements

Tlaisi

Swamidas

Akintürk

et al. 2012

MER

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In this study, experimental and analytical investigations are carried out on an overhanging cylindrical shaft carrying a propeller at the cantilever end, in order to identify the crack existence in shafts using the mechanical impedance approach. Also the experimental study uses the modal analysis software, LMS Test Lab^TM, for measuring and analyzing the response results from un-cracked and cracked shafts. In the numerical study, both the un-cracked and the cracked shafts (with varying crack depths) are modeled by finite element procedure. 3-D iso-parametric elements (element types 186 and 187), available in the ANSYS FEM program, are utilized to model the system. The impedance and velocity frequency response functions are used to identify the crack depth in the shaft system. Impedance and mobility were measured and simulated in the vertical direction for the resonant frequencies and anti-resonant frequencies. The experimental results are used to validate the numerical results. A better crack detection procedure was obtained by the plot of the slope of the non-dimensional frequency ratio (in the resonant and anti-resonant regimes) vs. the non-dimensional crack depth ratio. By this method crack presence could be definite detected when the non-dimensional crack ratio is greater than 0.20 to 0.25. In addition monitoring of the lower torsional frequency indicated the crack presence even from the beginning stages

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“…Using specific way, the vibration data can be collected and will be useful in order to predict the dynamic behavior of the machines [6] [7]. This paper will present a method of collecting data using specific software and instruments to investigate the changes of natural frequency caused by the present of crack on the shaft.…”

Section: Introductionmentioning

confidence: 99%

The Experimental Method of Crack Detection in Shaft of Rotor System

2016

3rd International Conference on Innovative Engineering Technologies (ICIET'2016) August 5-6, 2016 Bangkok (Thailand)

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Abstract-: Cracks issues become more important agenda in industrial and building sectors. A crack shaft is one of the common defects in the rotor arrangement and early detection of this failure mode is a really serious thing. The aim of this research was to examine the dispute in the dynamic properties between multiple cracked and un-cracked shaft includes frequency response and natural frequency by experimental procedures using 6-channel analyzer systems. The experiment was carried out on a shaft under un-cracked and also cracked condition with the several depth of crack. The analysis was performed along a circular mild steel shaft with linear solid behavior in which considered six conditions of parameters including un-cracked, first cracked, second cracked, third cracked, fourth cracked, and fifth cracked. Free-free boundary condition was applied into model. The natural frequencies (Hz) obtained from experimental were analyzed and assessed.

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Dynamics of Cracked Composite Shafts

Cited by 8 publications

References 16 publications

Finite element analysis of functionally hybridized carbon/glass composite shafts

Finite element analysis of functionally hybridized carbon/glass composite shafts

Crack Detection in Shafts Using Mechanical Impedance Measurements

The Experimental Method of Crack Detection in Shaft of Rotor System

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