Accession Number : AD0770447

Title :   Hydraulic Grip System for Composite Tube Specimens.

Descriptive Note : Technical rept. Apr 72-1 Aug 73,

Corporate Author : SOUTHWEST RESEARCH INST SAN ANTONIO TEX

Personal Author(s) : Nagy,A. ; Lindholm,U. S.

Report Date : SEP 1973

Pagination or Media Count : 35

Abstract : This report describes the development of a hydraulic grip system for use in the mechanical testing of composite tubular specimens under biaxial loads. The objective of the grip system is to eliminate the constraints imposed by rigidly bonded end tabs which generally lead to premature failure in strength tests. The new hydraulic grip uses a uniform clamping pressure to transfer axial and torsional loads to the specimen and an active, servo-controlled, differential clamping pressure to produce radial displacement in the grip which compensates for changes in diameter of the specimen gage section during loading. This active control feature minimizes the bending stresses at the specimen-grip interface. Preliminary tests with the grip demonstrate its load transfer capability and the active compensation feature. (Author-PL)

Descriptors :   *Fastenings, Hydraulic equipment, Tubes, Loads(Forces), Clamps, Test equipment, Composite materials

Subject Categories : Couplers, Fasteners, and Joints

Distribution Statement : APPROVED FOR PUBLIC RELEASE