Thread-Locking Adhesive Failure and a Unique Corrective Action
- 166 Downloads
Thread-locking adhesives are commonly added to impart extra torque strength as well preventing screws from backing out during use. Many of these adhesives rely on anaerobic (oxygen free) conditions for curing. Often, if not properly cured, the locking compounds which are usually oily liquids, actually behave in a manner completely opposite of design and screws intended to be strengthened are in fact compromised beyond if no locking compound were present at all. Discussed herein is such an example in which, if a solution were not found to allow for curing of the locking compounds on assembled systems, over 2,000 costly sensor assemblies would have been scrapped. Fortunately, an unconventional solution was found.
KeywordsThread lock Thread locker Adhesive Adhesive cure Characterization Chemistry Failure analysis
- 1.Loctite Worldwide Design Handbook 1996/97 Edition. ISBN 0964559005Google Scholar
- 2.Wiberg, C.: Effects of Oxygen Inhibition in Acrylic and Non-Acrylic Free Radical Systems. RadTech Europe, The Hague. http://www.radtech-europe.com/knowledge-center/articles/other/effects-oxygen-inhibition-acrylic-and-non-acrylic-free-radical
- 3.WLC Rasmussen. Virginia Tech Unrestricted Thesis Chapter. http://scholar.lib.vt.edu/theses/available/etd-12202001-135708/unrestricted/ThesisChapter2Part1B.PDF