US 12,259,364 B2
Strain testing rig and method of evaluating strain characteristics of specimen
Randall Perkins, Houston, TX (US)
Assigned to Bayou Holdco, Inc., Houston, TX (US)
Filed by Bayou Holdco, Inc., Houston, TX (US)
Filed on Feb. 18, 2022, as Appl. No. 17/675,939.
Prior Publication US 2023/0266215 A1, Aug. 24, 2023
Int. Cl. G01N 3/04 (2006.01); G01N 3/08 (2006.01); G01N 3/10 (2006.01); G01N 3/20 (2006.01)
CPC G01N 3/04 (2013.01) [G01N 3/08 (2013.01); G01N 3/10 (2013.01); G01N 3/20 (2013.01); G01N 2203/0048 (2013.01); G01N 2203/0264 (2013.01); G01N 2203/0282 (2013.01); G01N 2203/04 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A strain testing rig for testing an elongate specimen having a first end portion and a second end portion spaced apart along a specimen axis and a length extending from the first end portion to the second end portion along the specimen axis, the strain testing rig comprising:
a first grip for gripping the first end portion of the specimen;
a second grip for gripping the second end portion of the specimen;
a support surface positioned to engage a central portion of the specimen; and
a drive mechanism configured to move the first grip away from the second grip to stretch the specimen lengthwise, and to bend the specimen against the support surface;
wherein the first grip and the second grip are configured to maintain a grip on the specimen as cross-sectional area of the specimen decreases during stretching.