Patent ID: 8966992
Filing Date: 2015-03-03
Classification: G01B,G01N

Abstract:
1. A load frame assembly comprising: a frame assembly; a servomotor coupled to the frame assembly, the servomotor having a control system; an actuator assembly having a ball screw assembly, with a ball screw and a ball screw nut rotatably coupled to the ball screw, one of the ball screw and the ball screw nut being coupled to the frame assembly to preclude linear movement therealong, and coupled to the servomotor to facilitate rotation thereof about an axis; first crosshead assembly coupled to one of the ball screw and the ball screw nut, the first crosshead assembly slidably positionable within the frame assembly so as to move linearly therealong; a second crosshead assembly spaced apart from the first crosshead assembly and coupled to the frame assembly, wherein a specimen may be configured at a first end to move with the first crosshead assembly and at a second end to move with the second crosshead assembly; a load frame coupled to one of the first and second crosshead assemblies; and a displacement sensor associated with the frame assembly and at least one of the first and second crossheads, the displacement sensor configured to measure displacement of at least one of the first and second crossheads with which the displacement sensor is associated relative to the frame assembly.