PROFILE
Mr.
M.R. Shiva Kumar M E, MISTE
Lecturer
Department of Industrial Engineering
and Management
M S Ramaiah Institute of Technology
M S R Nagar, Bangalore-560054
M.E. DISSERATON PROJECT
(2004):
“EVALUATION OF EFFECTIVE ELASTIC MODULUS FOR FIBER
REINFORCED CERAMIC
MATRIX COMPOSITE WITH MATRIX CRACKING USING FINITE
ELEMENT TECHNIQUES”
SYNOPSYS:
Composites are ideal
materials for structural applications where high strength-to-weight and high
stiffness-to-weight ratios are desirable. Aircraft and spacecraft are typical
weight -sensitive structures in which composite materials are cost-effective
and finding increasing applications.
Ceramic matrix composites
(CMCs) are an important class of composite materials and provide as alternative
substitutes for conventional engineering materials when specific mechanical
properties necessary for high /ambient temperature applications are desirable.
Apart form possessing high strength to weight ratio and high stiffness to weight ratio, they
offer elevated temperature stability,
low thermal conductivity , etc., which improve their performance
characteristics.
A Successful application of
CMCs in engineering design requires a detailed characterization of their
mechanical and thermal properties. The mechanical properties, in particular the
elastic moduli play an important role in determining the mechanical stresses
that these components (made of CMCs) will experience during service conditions.
Fiber –reinforced ceramic
matrix composites are being developed to withstand stress levels in excess of
the stresses at which matrix cracks form. It is expected that these components
made of CMCs will have matrix cracking in regions of high stress concentration.
Since matrix cracking changes the effective elastic moduli, the mechanical
stresses induced in the component will be affected.
Exact solutions have been
proposed by different researchers for the effective elastic moduli for CMCs
with matrix cracks based on elasticity approach and making some simplifying
assumptions. Simplifying assumptions will dilute the quality of the predicted
results and pose a question on the accuracy of the subsequently calculated
mechanical stresses using the effective elastic moduli.
The objective of the
present work is to make a more accurate evaluation of the effective elastic
moduli for a fiber –reinforced CMC by taking into account the effects of matrix
cracking using finite element techniques. The front –end commercial software ANSYS
will be adopted in the current investigation.
Some important results of
the research investigations:
Figure 1: UY-Displacement
contours
Figure 2: Normalized elastic modulus as function
crack density for 30% fiber volume fraction
Education:
1.
M.E
(Manufacturing science and engineering) from University Visvesvaraya College of
Engineering,
2.
B.E.
(Mechanical) from P E S
Professional Experience:
1. Presently Working as lecturer in M S
Ramaiah Institute of Technology since August 2005
2. Worked as lecturer in The Oxford College
of Engineering for two years.
3. Worked as lecturer in NSVK Polytechnic for
eight years.
Subjects Taught:
* Engineering Graphics
* Machine Drawing
* Mechanical Engineering Science
* Manufacturing process
* Basic thermodynamics
* Applied thermodynamics
* Kinematics of machine
* Dynamics of Machines
* Fluid mechanics
Publications:
1. R. Shankara Reddy, M R Shiva Kumar and K
2. R Shankara Reddy, M R Shiva Kumar and K
3. R Shankara Reddy, M R
Shiva Kumar and K
Contact Details:
Home: # 506/A, 2nd cross, 2nd Main, Nagendra
Block, BSK - 1st Stage,
E-Mail: mrshivakumar_gowda@rediffmail.com;
Phone:
080-23600822, 080-2360934 (Ext: 322) Mobile:
984410521
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