PROFILE
Name: LOKESHA G.
Designation: LECTURER
Qualification: M.E.
(UVCE)
M.E. DISSERATON PROJECT
(2004):
“EVALUATION OF EFFECTIVE COEFFICIENT OF THERMAL EXPANSION
FOR FIBER-REINFORCED CERAMIC MATRIX COMPOSITE WITH MATRIX CRACKING USING FINITE
ELEMENT METHOD”
SYNOPSYS:
Ceramic Matrix composites (CMCs) have
emerged as an advanced class of structural materials for aerospace, automotive
and allied industries. These materials provide as alternative substitutes for
conventional engineering materials when specific mechanical properties
necessary for high/ambient temperature applications are desirable. High
strength to weight ratio, high stiffness to weight ratio, elevated temperature
stability, low thermal conductivity are some of the improved performance
characteristics offered by CMCs.
A successful application of CMCs in
engineering design requires a detailed characterization of their mechanical and
thermal properties. The thermal expansion properties of the composites play an
important role in determining the thermal stresses in components made of CMCs.
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 thermal expansion coefficients of the composite,
thermal stresses induced in the component by the high temperature environment
will be affected by matrix cracking. The non-uniform spatial distributions of
matrix crack can contribute to thermal stresses like the non-uniform
temperature gradients do.
Different researchers have proposed
analytical solutions for effective CTE’s for CMCs without and with matrix
cracks based on elasticity approach and making some simplifying assumptions.
These simplifying assumptions will dilute the quality of the predicted results
and pose a question on the accuracy of the subsequently calculated thermal
stresses using the effective coefficient of thermal expansion.
The objective of the present investigation
is to carry out a more accurate evaluation of the effective coefficient of
thermal expansion for a fiber-reinforced CMC by taking into account the effects
of matrix cracking using finite element techniques. The front-end commercial
software ANSYS is adopted in the current investigation. The results obtained
show a good agreement with published results.
Education:
1.
M.E (Manufacturing Science & Engineering) from
2.
B.E. (Mechanical) from Dr. A.I.T.,
Professional Experience:
1. Lecture of Mechanical Engineering,
RJS Polytechnic
2. Lecture in Mechanical Engineering, Vemana Institute of Technology, Bangalore, 2005 to till date
Publication:
Shankar Reddy R., Lokesh G., Vidhya Sagar H.N. and Shivakumar Aradhya K.S., 2004,
“Evaluation of Effective Coefficient of Thermal Expansion for Fiber Reinforced
Ceramic Matrix Composite Using Finite Element Method”, Proc., National
Conference on Mechanical Engineering, M.S.R.I.T,
Contact Details:
Lecturer, Dept. of Mechanical of Engineering, Vemana
Institute of Technology
Koramangla,
E-Mail: lokeshgreddy_vit@yahoo.co.in
Phone:
080-27820735, 9448694378
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