Study examines effects of boron filament diameter on bonds and joints in boron-aluminum composite. Data include static strength, fatigue, and dynamic moduli of elasticity. Manson-Coffin analyses and metallurgical and fracture surface evaluation were also performed

Hersh, M. S.

English

NASA Technical Reports Server

March 1973	 B73-10079 
NASA TECH BRIEF 
Marshall Space Flight Center 
NASA Tech Briefs announce new technology derived from the U.S. space program. They are issued to encourage 
commercial application. Tech Briefs are available on a subscription basis from the National Technical Information 
Service, Springfield, Virginia 22151. Requests for individual copies or questions relating to the Tech Brief program may 
be directed to the Technology Utilization Office, NASA, Code KT, Washington, D.C. 20546. 
Fatigue of Boron-Aluminum Composites Bonds and Joints 
Composites hold considerable promise as lightweight, 
high modulus, corrosion resistant, structural materials. 
There are, however, several technical problems to be 
overcome before composites can be widely used. A 
study of one such problem, the bonding and joining of 
composites, is discussed in detail in a recent study. 
The effects of boron filament diameter on bonds 
and joints are examined for boron-aluminum composites. 
The data developed were not previously available and 
will be of interest to many industries considering the de-
velopment of composite technology. 
The data include static strength, fatigue, and dynamic 
moduli of elasticity; Manson-Coffin analyses and metal-
lurgical and fracture surface evaluation were also per-
formed. The joining methods examined are diffusion 
bonding, aluminum dip brazing, iow.temperature brazing, 
resistance welding, riveting, and mechanical fastening. 
The intent of the study has been to provide a 
preliminary view of fatigue of B/Al joints. In addition 
to the substantial quantity of data accumulated, several 
conclusions concerning B/Al composites were drawn. 
a. The static and fatigue strength of B/Al, uni-
directionally reinforced with 0.14 mm (5.6 mil) 
boron, is superior to that of B/Al reinforced with 
0.10 mm (4.0 mil) boron.
b. The static and fatigue strength of some joints in 
B/Al reinforced with 0.10 mm (4.0 mil) B is 
superior to those joints reinforced with 0.14 mm 
(5.6 mil) B. 
c. The fatigue strength of Hi-Lock fastener joints is 
superior to that of resistance weld or rivet joints. 
d. The fatigue strength of low-temperature braze 
joints is inferior to that of dip braze or diffusion 
bond joints. 
Note: 
Requests for further information may be directed 
to:
Technology Utilization Officer 
Marshall Space Flight Center 
Code A&PS-TU 
Marshall Space Flight Center, Alabama 35812 
Reference: B73-10079
Source: M. S. Hersh of

General Dynamics Corp.

under contract to

Marshall Space Flight Center

(MFS-22325) 
Category 04 
This document was prepared under the sponsorship of the National
	 Government assumes any liability resulting from the use of the 
Aeronautics and Spadb 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.
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Fatigue of boron-aluminum composites bonds and joints

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