NDLI: Lap shear testing of candidate radiator panel adhesives

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Lap shear testing of candidate radiator panel adhesives

Content Provider	NASA Technical Reports Server (NTRS)
Author	Ellis, David Briggs, Maxwell McGowan, Randy
Copyright Year	2013
Description	During testing of a subscale radiator section used to develop manufacturing techniques for a full-scale radiator panel, the adhesive bonds between the titanium heat pipes and the aluminum face sheets failed during installation and operation. Analysis revealed that the thermal expansion mismatch between the two metals resulted in relatively large shear stresses being developed even when operating the radiator at moderate temperatures. Lap shear testing of the adhesive used in the original joints demonstrated that the two-part epoxy adhesive fell far short of the strength required. A literature review resulted in several candidate adhesives being selected for lap shear joint testing at room temperature and 398 K, the nominal radiator operating temperature. The results showed that two-part epoxies cured at room and elevated temperatures generally did not perform well. Epoxy film adhesives cured at elevated temperatures, on the other hand, did very well with most being sufficiently strong to cause yielding in the titanium sheet used for the joints. The use of an epoxy primer generally improved the strength of the joint. Based upon these results, a new adhesive was selected for the second subscale radiator section.
File Size	1476281
Page Count	8
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20150007503
Archival Resource Key	ark:/13960/t3xt0q75h
Language	English
Publisher Date	2013-02-25
Access Restriction	Open
Subject Keyword	Metals And Metallic Materials Thermal Expansion Adhesives Aluminum Epoxy Resins Heat Pipes Metal Sheets Shear Stress Titanium Adhesive Bonding Manufacturing Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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