Mechanical Engineering ETDs

Publication Date

3-28-1962

Abstract

The purpose of this thesis was to determine and evaluate an experimental method for accurately measuring thermal stresses in structural shapes subjected to large transient thermal gradients, without introducing the problems of high temperature instrumentation, or expensive and elaborate test facilities. Most experimental methods consist of mounting high temperature strain gages on the prototype or model of the metal structure to be evaluated, thermal shocking the structure and then recording the accompanying strains. This method is used quite extensively in the aircraft field, and in others, where the effects of thermal stresses must be considered. However, problems are encountered when using this method. Strain gages and bonding material become unreliable at high temperatures, elaborate and expensive recording instruments are needed, and considerable time is involved in instrumentation. Another method makes use of photoelasticity. With this method, the complete stress pattern of a structure may be seen. The disadvantages are that either the structure to be studied must be made of a photoelastic material, or photoelastic material must be applied to the structural surfaces to be studied. In either case, the range of temperatures that can be analyzed is greatly reduced. A third method is to build and rebuild the structure until it withstands the thermal shock. Needless to say, this method runs into a great amount of expense and time. In essence, all the above mentioned methods mean time, expense, and problems.

Degree Name

Mechanical Engineering

Level of Degree

Masters

Department Name

Mechanical Engineering

First Committee Member (Chair)

Richard Charles Dove

Second Committee Member

Frederick Dsuin Ju

Third Committee Member

Charles Theron Grace

Document Type

Thesis

Language

English

Download

Share

COinS