International Research Journal of Engineering and Technology (IRJET) Volume: 04 Issue: 02 | Feb -2017
www.irjet.net
e-ISSN: 2395 -0056 p-ISSN: 2395-0072
Modal Analysis Of Cracked Continuous Beam Using ANSYS 1
P. Y. Ghodke, 2 D. H. Tupe , 3 G. R. Gandhe
Department of Civil Engineering, Deogiri Institute of Engineering and Management Studies, Dr. BAMU University, Aurangabad, Maharashtra, India. ---------------------------------------------------------------------------***---------------------------------------------------------------------Abstract: In this present work, the important task is to
beams is crack free or any crack is present in beam and
determine the effect of crack on the beam structure. The
to detect the crack position of beam for our safety
presence of cracks in structure is changes the physical
purpose. A crack or local defect is affects on the vibration
properties and its dynamics response. The effect on
response of the structural member. It results in the
structure are analysed using ANSYS software and then it
changes of natural frequencies and its mode shapes of
compare with the regression analysis. In vibration
crack and uncrack structure. Also crack may be classified
analysis the crack location and crack depth is the main
on the basis of geometry and its orientation as cracks
parameter to determine the natural frequencies and its
parallel to shaft axis are known as longitudinal cracks,
changes in mode shape. The natural frequencies is
cracks that are open and close when affected part of
decreases when increasing the crack depth at same
material is subjected to alternative stresses are known
location of beam. It results the reduction of natural
as breathing crack, crack which are perpendicular to the
frequencies and change their mode shape of crack and
axis of shaft are known as transverse crack, the cracks on
without crack beam. ANSYS V15 software is used for FE
surface which is not visible known as sub-surface crack,
analysis of both crack and uncrack simply supported
crack which appear on the surface are known as surface
continuous beam with two different materials one is
crack.
structural steel and another aluminium. Creo software is used to designing of I section simply supported
What is Vibration.
continuous beam model.
The term vibration describes repetitive motion that can
Keywords:- ANSYS, Creo, Natural frequency, Crack,
be measured and observed in a structure. Unwanted
Modal analysis, Simply supported continuous beam .
vibration can be causes fatigue or degrade the performance of the structure. Therefore it is desirable to
INTRODUCTION
reduce the effects of vibration. In other cases, vibration
Vibration analysis method is a very good approach to
is not able to be avoided or even desirable. In this case,
crack detection in beams. All most all types of beam
the goal is to understand the effect on the structure, or to
operated under different kinds of loading conditions, which
may
be
causes
damages
and
cracks
control or to modify the vibration, or isolate it from the
in
structure and minimize structural response.
overstressed zones. Cracks is also found in mechanical foundations due to different reasons. Generally in
What is Free Vibration.
structural members like beam the presence of crack
Free vibration is the natural response of a structure to
causes the reduction in stiffness which is depends on
some impact or displacement. The response are
two parameters; location of crack and depth of the crack.
complete determine by the properties of the structure,
In now a days it is very important to know whether the
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