Collets hold specimen in place while epoxy resin cements the broken ends, thereby eliminating relative rotation of the fracture faces. The cemented fracture can then be sectioned metallographically

Pardoe, A. R.

Pellett, H. E.

English

NASA Technical Reports Server

September 1970	 Brief 70-10455 
NASA TECH BRIEF
	
&*-, 
NASA Tech Briefs announce new technology derived from the U .S. space program. They are issued to encourage corn ucrci,iI 
application. Tech Briefs are available on a subscription basis from the Clearinghouse for Federal Scientific and Technical 
Information, Springfield, Virginia 22151. Requests for individual copies or questions relating to the Tech Brief program may 
be directed to the Technology Utilization Division, NASA, Code UT, Washington, D.C. 20546. 
Accurate Reassembl y
 of Small Broken Test Specimens 
A small broken specimen can be reassembled with-
out relative rotation of the faces of the fracture. The 
cemented fracture can then be sectioned metallogra-
phically, for example. One such technique was de-
signed for reassembly of a 0.125-in.-diam specimen 
broken during stress-corrosion tests. 
The unbroken ends of the two portions of the spec-
imen are held in two directly opposed collets (see 
fig.). The 90° angle of a two-faced mirror is placed 
heteen and helov. the opposed broken ends. The
mirror is made from a length of squared steel, two 
adjacent faces of which are polished before being 
coated with vapor deposited chromium. 
With the aid of the mirror observed through a mag-
nifier the two faces of the fracture are perfectly aligned 
before the collets are locked against rotation. The 
mirror is then lowered clear of the specimen; the two 
faces are brought close together and cemented with 
epoxy resin.
(continued oerIeat) 
-.
This document was prepared under the sponsorship of the National
	 Government assumes any liability resulting from the use of the 
Aeronautics and Space Administration. Neither the United States	 information contained in this document, or warrants that such use 
Government nor any person acting on behalf of the United States
	 will be free from privately owned rights.
https://ntrs.nasa.gov/search.jsp?R=19700000439 2020-03-17T00:49:04+00:00Z
Note: 
Requests for further information may be directed 
to:
Technology Utilization Officer 
Code A&TS-TU 
Marshall Space Flight Center 
Huntsville, Alabama 35812 
Reference: B70-10455
Patent status: 
No patent action is contemplated by NASA. 
Source: H. E. Pellett and A. R. Pardoe of 
North American Rockwell Corp. 
under contract to 
Marshall Space Flight Center 
(MFS-16730) 
Brief 70-10455	 Category 07


Accurate reassembly of small broken test specimens

Abstract

Similar works

Full text

Available Versions

NASA Technical Reports Server