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Title: Measuring alignment of loading fixture

Abstract

An apparatus and method for measuring the alignment of a clevis and pin type loading fixture for compact tension specimens include a pair of substantially identical flat loading ligaments. Each loading ligament has two apertures for the reception of a respective pin of the loading fixture and a thickness less than one-half of a width of the clevis opening. The pair of loading ligaments are mounted in the clevis openings at respective sides thereof. The loading ligaments are then loaded by the pins of the loading fixture and the strain in each loading ligament is measured. By comparing the relative strain of each loading ligament, the alignment of the loading fixture is determined. Preferably, a suitable strain gage device is located at each longitudinal edge of a respective loading ligament equidistant from the two apertures in order to determine the strain thereat and hence the strain of each ligament. The loading ligaments are made substantially identical by jig grinding the loading ligaments as a matched set. Each loading ligament can also be individually calibrated prior to the measurement.

Inventors:
 [1]
  1. (Saratoga Springs, NY)
Issue Date:
Research Org.:
Knolls Atomic Power Laboratory (KAPL), Niskayuna, NY
OSTI Identifier:
866946
Patent Number(s):
4827773
Assignee:
United States of America as represented by United States (Washington, DC) KAPL
DOE Contract Number:  
AC12-76SN00052
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
measuring; alignment; loading; fixture; apparatus; method; clevis; type; compact; tension; specimens; pair; substantially; identical; flat; ligaments; ligament; apertures; reception; respective; thickness; one-half; width; mounted; openings; loaded; pins; strain; measured; comparing; relative; determined; preferably; suitable; gage; device; located; longitudinal; edge; equidistant; determine; thereat; hence; jig; grinding; matched; set; individually; calibrated; prior; measurement; loading ligament; loading fixture; substantially identical; strain gage; compact tension; /73/

Citation Formats

Scavone, Donald W. Measuring alignment of loading fixture. United States: N. p., 1989. Web.
Scavone, Donald W. Measuring alignment of loading fixture. United States.
Scavone, Donald W. Sun . "Measuring alignment of loading fixture". United States. https://www.osti.gov/servlets/purl/866946.
@article{osti_866946,
title = {Measuring alignment of loading fixture},
author = {Scavone, Donald W.},
abstractNote = {An apparatus and method for measuring the alignment of a clevis and pin type loading fixture for compact tension specimens include a pair of substantially identical flat loading ligaments. Each loading ligament has two apertures for the reception of a respective pin of the loading fixture and a thickness less than one-half of a width of the clevis opening. The pair of loading ligaments are mounted in the clevis openings at respective sides thereof. The loading ligaments are then loaded by the pins of the loading fixture and the strain in each loading ligament is measured. By comparing the relative strain of each loading ligament, the alignment of the loading fixture is determined. Preferably, a suitable strain gage device is located at each longitudinal edge of a respective loading ligament equidistant from the two apertures in order to determine the strain thereat and hence the strain of each ligament. The loading ligaments are made substantially identical by jig grinding the loading ligaments as a matched set. Each loading ligament can also be individually calibrated prior to the measurement.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1989},
month = {1}
}

Patent:

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