Masters Theses


"Carbon/carbon composites are a family of advanced composite materials. They are the most advanced form of carbon and consist of a fiber, based on carbon precursors, embedded in a carbon matrix. They are extensively used in design of sliding contact systems such as clutches and brakes because of their low weight, excellent thermal and mechanical properties, chemical inertness and self lubricating capability. They retain their mechanical strength in inert atmospheres up to 2000° C. However, in oxidizing environments, C/C composites rapidly react with oxygen forming gaseous carbon oxides around 450° C.

In the present study a C/C composite clutch assembly is modeled and studied under simulated operating conditions using ABAQUS finite element package code. The multidisk clutch is idealized as a 2D axisymmetric finite element model to study thermomechanical and tribological behavior of the clutch. A FORTRAN language programmed user subroutine FRIC is developed and implemented in the study to interface with the main ABAQUS code to study thermomechanical behavior and to calculate wear of the material along frictional surfaces.

The objective of this research is to develop a model to study thermomechanical and tribological behavior of ceramic composites under simulated operating conditions. In the present design, changes in the duty cycle of the clutch results in excessive wear of the clutch material. The model developed in this research will be helpful in developing a composite with a low wear rate, high coefficient of friction, low density, and high centrifugal strength"--Abstract, page iii.


Dharani, Lokeswarappa R.

Committee Member(s)

Hilmas, Greg
Chandrashekhara, K.


Mechanical and Aerospace Engineering

Degree Name

M.S. in Mechanical Engineering


Air Force Research Laboratory (Wright-Patterson Air Force Base, Ohio)
Missouri University of Science and Technology. Center for Aerospace Manufacturing Technologies


Missouri University of Science and Technology

Publication Date



viii, 55 pages

Note about bibliography

Includes bibliographical references (pages 52-54).


© 2009 Shankar Nagaraj, All rights reserved.

Document Type

Thesis - Open Access

File Type




Subject Headings

Clutches (Machinery) -- Testing -- Computer simulation
Carbon composites
Heat resistant alloys

Thesis Number

T 10561

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