This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Understanding the Mechanical Behavior of Threaded Fasteners in Thermoplastic Bosses Under Load
Annotation ability available
Sector:
Language:
English
Abstract
Because it is common to attach plastic parts to other plastic, metal, or ceramic assemblies with mechanical fasteners that are often stronger and stiffer than the plastic with which they are mated, it is important to be able to predict the retention of the fastener in the polymeric component. The ability to predict this information allows engineers to more accurately estimate length of part service life.
A study was initiated to understand the behavior of threaded fasteners in bosses molded from engineering thermoplastic resins. The study examined fastening dynamics during and after insertion of the fastener and the effects of friction on the subsequent performance of the resin.
Tests were conducted at ambient temperatures over a range of torques and loads using several fixtures that were specially designed for the study. Materials evaluated include modified-polyphenylene ether (M-PPE), polyetherimide (PEI), polybutylene terephthalate (PBT), and polycarbonate (PC).
This paper shares the results of the study to help engineers better understand and predict the behavior of thermoplastics when engaged by threaded fasteners under varying conditions..
Recommended Content
Authors
Citation
Clark, C., Florence, R., Locke, D., Bartos, C. et al., "Understanding the Mechanical Behavior of Threaded Fasteners in Thermoplastic Bosses Under Load," SAE Technical Paper 960293, 1996, https://doi.org/10.4271/960293.Also In
References
- Wood Handbook: Wood as an Engineering Material U.S. Department of Agriculture (USDA) Handbook, Forest Service Forest Products Laboratory 1974
- Bartos, C. Leung, R. Rozmus, R. Trapp, M. Clamp Load and Strip-to-Drive Performance Measurements for Thermoplastic Bosses: Design of a Robust Joint 1995 International Body Engineering Conference, Advanced Technologies & Processes 19 135
- Bartos, C. Leung, R. Rozmus, R. Trapp, M. Hoy, R. Effect of Regrind on SMA Copolymer Boss/Joint Performance 1995 SAE International Congress and Exposition, Paper 9508810
- Hoy, Robert Bartos, Chris Leung, Richard Rozmus, Richard Trapp, Martin Determination of Dimensional Changes in Injection Molded Bosses using Strain Gages: Effects on Joint Durability 1994 SAE International Congress and Exposition, Paper 940653
- Accurate Threaded Fasteners
- Threaded Fasteners - Materials and Design: What Every Engineer Needs to Know Blake Alexander Marcel Dekker Inc., NY 1986 144 5
- “Up Tight and Out of Sight,” International Star Class 1992 World Championship Program Sept. 10 1992 B. S. Young and Associates Grosse Farms, MI 38 39