PROFILE
Name : Sudheer
M.
Designation :
Lecturer
Qualification: M.Tech (CIM)
M.Tech
Project Work (2005):
“Evaluation
of Apparent Elastic Moduli for Mulite/Alumina Ceramic Matrix Composites (CMCs) along
Non-principal Material Directions Using Finite Element Method”
Synopsis:
Composite materials are
gradually gaining increasing importance as structural materials in the present
day engineering design and development activity due to their attractive
mechanical and thermal properties such as high strength-to-weight ratio, high
stiffness-to-weight ratio, thermal shock resistance, corrosion resistance,
etc. Aircrafts and spacecrafts are
typical weight-sensitive structures in which composite materials are cost-effective
and finding extensive applications.
Ceramic Matrix Composites
(CMCs) are an important class of composites, which provide as alternate
substitutes for conventional engineering materials when specific mechanical
properties necessary for high ambient temperature applications are desirable.
Apart from possessing high strength to weight ratio and high stiffness to
weight ratio, they offer elevated temperature stability, low thermal conductivity
etc.
The mechanical and thermal properties of
composites along material principal directions are generally available in
literature or from the manufacturer. However, the properties along
non-principal material directions, which are invariably required in stress
calculations during design validation process, will not be readily available.
One has to use closed form equations, which give approximate values of these
engineering constants.
The major objectives of the present research work are:
1.
To
carry out a comprehensive literature survey on composite materials, in
particular the ceramic matrix composites and their importance as structural
materials in the present engineering context;
2.
To
provide an over view of different mechanical & thermal properties
associated with composite materials and a summary of the analytical methods
used for the computation of apparent elastic moduli; and
3.
To
develop a methodology for evaluating the engineering constants along
non-principal material directions using Finite Element techniques.
The methodology developed is extended to
the computation of apparent elastic constants for Mulite/Alumina Ceramic Matrix Composite system. The effect of
varying volume fraction and fiber orientation on the engineering constants will
be taken into consideration. The front-end commercial software ANSYS is adopted
in the present study. The FEM formulation is carried out using plane stress
modeling approach with PLANE42 element. The results obtained are compared with
the analytically calculated values.
Important
Results of the Investigation:
From the evaluation of Apparent Elastic
Moduli (Ex, Ey, νxy, νyx
and Gxy), it is observed that largest and smallest material
properties occurred in the Non-Principal material directions. Hence with a new
composite material, its moduli as a function of fiber angle θ should be
examined to truly understand its character.
Awards/Achievements:
2nd Rank under Visvesvaraya Technological University
Contact
Details:
Address: Lecturer,
Department of Mechanical Engineering,
Mangalore 575 028, Karnataka
State,
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