SYMPOSIA PAPER Published: 01 January 1997

Control of a Biaxial Test Using Calculated Input Signals and Cascade Control


Control of a single-channel material test is relatively straightforward with modern servocontrollers. During this type of test, the center of the specimen moves as the specimen length changes. Although normally not a problem, this motion is not acceptable for some tests, such as planar biaxial tests. Relative motion of the specimen center will introduce unwanted stresses in the test piece and make visual monitoring of the specimen difficult.

This paper describes a control technique to minimize specimen motion in the planar biaxial test application. It utilizes calculated input signals for the feedback. The control architecture is a cascade control loop. Description of the basic control method is provided and actual test results showing specimen motion with and without the control are presented.

Author Information

Albright, FJ
MTS Systems Corp., Eden Prairie, MN
Johnson, LE
MTS Systems Corp., Eden Prairie, MN
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Developed by Committee: E08
Pages: 147–157
DOI: 10.1520/STP11547S
ISBN-EB: 978-0-8031-5361-5
ISBN-13: 978-0-8031-2416-5