This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Stress Analysis of Instrument Panel Knobs
Technical Paper
2000-01-0316
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Event:
SAE 2000 World Congress
Language:
English
Abstract
In this paper, hoop stresses in the hubs of plastic knobs used in instrument panels are analyzed. The objective is to provide analytical formulas for stresses due to knob assembly and temperature cycling. Insertion forces are estimated using simple beam equations to model spring deflection. These forces are used to predict stresses in the D-shaped hubs of the knobs, using equations for thick pressure vessels. Solutions for stresses due to thermal expansion mismatches between the plastic hub and metal spring are derived using a press-fit analogy. Finite element analysis (FEA) is used to supplement and validate the analytical results. The proposed simple calculations are useful for up-front design assessment, enabling the engineer to select appropriate dimensions for knob hubs, springs and shafts.
Recommended Content
Citation
Krishna, A., "Stress Analysis of Instrument Panel Knobs," SAE Technical Paper 2000-01-0316, 2000, https://doi.org/10.4271/2000-01-0316.Also In
References
- Shigley, J. E. Mechanical Engineering Design 1st McGraw Hill 653 654 1986
- ANSYS 5.5 Finite Element Analysis Software SAS IP Inc. 1998
- Boresi, A. P. Sidebottom, O. M. Advanced Mechanics of Materials 4th Wiley 108 110 1985
- Grichnik, M. “Writing a Best Practice Document for Knob System Design,” Delphi Delco Electronics Systems Internal Report 1996
- Lynch, C. T. Handbook of Materials Science CRC Press 1 333 341 1974
- Krishnamachari, S. I. Applied Stress Analysis of Plastics Von Nostrand Reinhold 49 158 1993