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RESEARCH PAPERS

The Rate (Time)-Dependent Behavior of Ti-7Al-2Cb-1Ta Titanium Alloy at Room Temperature Under Quasi-Static Monotonic and Cyclic Loading

[+] Author and Article Information
D. Kujawski, E. Krempl

Department of Mechanical Engineering, Aeronautical Engineering, and Mechanics, Rensselaer Polytechnic Institute, Troy, N. Y. 12181

J. Appl. Mech 48(1), 55-63 (Mar 01, 1981) (9 pages) doi:10.1115/1.3157592 History: Received January 01, 1980; Revised July 01, 1980; Online July 21, 2009

Abstract

Uniaxial tests using a servocontrolled testing machine and strain measurement at the gage length were performed on a high-strength, low-ductility Titanium alloy. Tests involved monotonic and cyclic loadings with strain rates between 2 × 10−8 to 10−3 s−1 , stress rates from 10−1 to 102 MPa s−1 , repeated changes in strain rates, and short-term relaxation and creep tests. The inelastic behavior is strongly rate-dependent. Ratchetting is shown to increase as the stress rate decreases. No strain-rate history effect was found. A unique stress-strain curve is ultimately reached for a given strain rate irrespective of prior history as long as only positive stresses are imposed. In the plastic range the relaxation drop in a given time period depends only on the strain rate preceding the test and is independent of the actual stress and strain.

Copyright © 1981 by ASME
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