An Experimental Method for Testing Materials at the Intermediate Strain Rate with Closed Loop Control

Author

Cory N. Krivanec

Issuing Body

Mississippi State University

Advisor

Whittington, Wilburn

Committee Member

El Kadiri, Haitham

Committee Member

Jones, Bill

Date of Degree

12-14-2018

Document Type

Graduate Thesis - Open Access

Major

Mechanical Engineering

Degree Name

Master of Science

College

James Worth Bagley College of Engineering

Department

Department of Mechanical Engineering

Abstract

Quasi static and intermediate strain rate (5 s-1 and 500 s-1) tests are conducted on various aluminum and steel ASTM E8 subsize tensile specimens to validate a newly developed testing method which combines a previously developed serpentine bar for load monitoring and a newly described high-speed actuator. This new actuator is controlled by a semi-passive piezoelectrically actuated brake system mounted to a standard actuator, which allows for the actuator to produce high loads and quick response times (≈100 µs). Limitations of this experimental method are that tests must be monotonic (tension or compression but not cyclic loading) and strain rate rise times limit this method to the intermediate strain rate regime (below 500 s-1).

URI

https://hdl.handle.net/11668/19698

Recommended Citation

Krivanec, Cory N., "An Experimental Method for Testing Materials at the Intermediate Strain Rate with Closed Loop Control" (2018). Theses and Dissertations. 553.
https://scholarsjunction.msstate.edu/td/553