Doctoral Dissertations

Maher Kassar

Abstract

"In structural design, the material properties of steels and the strengths of cold-formed steel members are affected by strain rate. Two subjects were investigated experimentally and analytically in this study. They are 1) effect of strain rate on mechanical properties of sheet steels in tension and compression, and 2) structural strengths of stub columns and beams subjected to dynamic loads.

Three sheet steels with nominal yield strengths ranging from 35 to 100 ksi were studied under different strain rates. A total of 124 tensile coupons and 54 compressive coupons were tested in this phase of study. The structural strengths of 37 stub columns and 30 beam specimens fabricated from 35XF sheet steel were investigated in the second phase of this study under different strain rates. The results showed that the material properties as well as the strengths of the structural members increased with the strain rate. The amount of increase was found to be dependent on the material yield strengths and the strain rates used in the tests.

The effective width approach included in the current AISI Automotive Steel Design Manual was utilized for the evaluation of member strengths using static and dynamic yield stresses corresponding to the strain rates used in the tests. Good agreement was achieved between the predicted and tested member strengths when using the dynamic yield stresses in the comparison"--Abstract, page iii.

Advisor(s)

Yu, Wei-wen, 1924-

Committee Member(s)

Andrews, William A., 1922-2009
Best, John, 1925-2015
Keith, Harold D. (Harold Dean), 1941-
Minor, Joseph E.

Department(s)

Civil, Architectural and Environmental Engineering

Degree Name

Ph. D. in Civil Engineering

Sponsor(s)

American Iron and Steel Institute

Publisher

University of Missouri--Rolla

Publication Date

Spring 1990

Pagination

xxvii, 329 pages

Note about bibliography

Includes bibliographical references (pages 314-324).

Rights

© 1990 Maher Kassar, All rights reserved.

Document Type

Dissertation - Restricted Access

File Type

text

Language

English

Subject Headings

Steel, Structural -- TestingSteel -- Cold workingStrains and stressesBuckling (Mechanics)

Thesis Number

T 6063

Print OCLC #

23228201

Electronic OCLC #

905112056

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