Alternative Title

Civil Engineering Study 92-2


INTRODUCTION It is well known that the material properties of steels and the strengths of cold-formed steel members are affected by strain rate. Therefore, the research project sponsored by the American Iron and Steel Institute (AISI) at the University of MIssouri-Rolla during the period from January 1988 through December 1991 was concentrated on a study of the effect of strain rate on mechanical properties of sheet steels and the structural behavior and strength of cold-formed steel members subjected to dynamic loads. Because the previous UMR studies were limited only to the structural members such as stub columns and beams which were assembled with the same material in a given section, the objective of this investigation is to study the structural strength of hybrid automotive structural components using different sheet steels. In this report, two selected sheet steels (25AK and 50SK) were tested to study the effect of strain rate on mechanical properties. The mechanical properties of 25AK and 50SK sheet steels obtained from materials tests will be used later in the evaluation of test results of structural members. A total of 48 tensile coupons and 48 compressive coupons were tested in this phase of study and reported herein. This study was primarily involved with the experimental determination of the dynamic properties of two different sheet steels with nominal static yield strengths of 25 and 50 ksi. The strain rates used 10-4 to 1.0 in./in./sec. All tests were performed at Engineering Research Laboratory of University of Missouri-Rolla by using the MTS 880 test system. In Chapter II of this report, the experimental study of the mechanical properties of the selected sheet steels are presented in detail. The material test results are evaluated in Chapter III. Finally, conclusions are presented in Chapter IV.


Civil, Architectural and Environmental Engineering

Research Center/Laboratory(s)

Wei-Wen Yu Center for Cold-Formed Steel Structures


American Iron and Steel Institute

Appears In

Cold-Formed Steel Series


Missouri University of Science and Technology (formerly the University of Missouri--Rolla)

Publication Date


Document Version

Final Version


© Missouri University of Science and Technology (formerly the University of Missouri--Rolla)


Seventeenth Progress Report

Document Type

Report - Technical

File Type