The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 07, 1989
Filed:
Jan. 25, 1988
Niel R Petersen, Minnetonka, MN (US);
David G Chasco, Bloomington, MN (US);
MTS Systems Corporation, Eden Prairie, MN (US);
Abstract
A tensile test controller has both load and stroke control circuits that are coupled together to permit tensile testing a specimen while controlling the load on the specimen, and when the specimen yields, for safely and smoothly switching to stroke control to complete the test and break the specimen. The controller has circuits which provide control over the velocity of the actuator as the specimen yields, and to prevent the specimen from being placed into compression, and also to sense the plastic specimen deformation a desired amount after it has yielded, but before the stroke control function is activated. Simplified supervisory gates are used to insure that the appropriate signal is controlling the test.