Masters Theses

Abstract

"Friction Stir Welding is an innovative solid-state joining process where the material is welded without the temperatures reaching melting point. The friction stir welding tool has a large-diameter shoulder and a smaller threaded pin. The rotating tool is moved along the joint interface and the welding is accomplished by the frictional heat generated at the interface of the shoulder and work-material, and severe plastic deformation at the interface of the pin and work-material. Modification of microstructure by this process is called friction stir processing.

The present study involves fatigue life analysis of partially friction stir processed components and numerical modeling of material flow during friction stir processing. Finite element based fatigue life calculations were carried out for various A356 samples and components including an automotive wheel rim in cast and partially friction stir processed conditions. The visco-plastic flow of material around the pin is simulated by solving the equations of conservation of mass, momentum and energy. The forces acting on the tool are estimated for various welding speeds and rotational velocities of the tool"--Abstract, page iv.

Advisor(s)

Krishnamurthy, K.
Mishra, Rajiv S.

Committee Member(s)

Chandrashekhara, K.

Department(s)

Mechanical and Aerospace Engineering

Degree Name

M.S. in Mechanical Engineering

Publisher

University of Missouri--Rolla

Publication Date

Summer 2006

Journal article titles appearing in thesis/dissertation

  • 2-D and 3-D transient simulation of material flow during friction stir welding
  • Finite element based fatigue analysis of friction stir processed A356 components

Pagination

x, 47 pages

Note about bibliography

Includes bibliographical references.

Rights

© 2006 Sai Siva Prasad Muppur, All rights reserved.

Document Type

Thesis - Restricted Access

File Type

text

Language

English

Subject Headings

Aluminum alloys -- WeldingFriction weldingWelded joints -- Fatigue

Thesis Number

T 9026

Print OCLC #

85763893

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