This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Experimental Verification of Residual Compression in Tempered Automotive Glass with Holes
Technical Paper
2003-26-0012
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Tempered float glass is commonly used for both side windows and backlites in the automotive industry. The success of such products is primarily attributed to high level of residual compression, following tempering, which provides abrasion resistance as well as 3X higher functional strength to sustain mechanical, vibrational and thermal stresses during the vehicle's lifetime. Certain applications of tempered glass, however, require mounting holes whose surface-finish must be controlled carefully to withstand transient tensile stresses during tempering. Simultaneously, the nature and magnitude of residual compression at the hole must provide sufficient robustness to bear mounting, vibrational and thermal stresses throughout the life of the vehicle. This paper presents (i) analysis of residual compression at the hole, (ii) measurement of biaxial strength of annealed glass with hole at center, and (iii) measurement of biaxial strength of tempered glass with hole at center. Both fractographic analysis and the biaxial strength data of annealed and tempered glasses are used to deduce the magnitude of residual compression at the hole. These data show excellent agreement between analytical solution for residual compression and that inferred from biaxial strength.
The nature of residual stresses at the hole, which differs considerably from that of classical tempering, is highlighted.
Recommended Content
Authors
Citation
Gulati, S., Cleary, T., and Davies, R., "Experimental Verification of Residual Compression in Tempered Automotive Glass with Holes," SAE Technical Paper 2003-26-0012, 2003, https://doi.org/10.4271/2003-26-0012.Also In
References
- Gulati, S. T. et al. “Biaxial Strength of Ultrathin AMLCD Glass Substrates” SID'02 Digest May 2002 Boston, MA Society for Information Display Santa Ana, CA
- Akcakaya, R Gulati, S.T. “Effect of Edge Finish of Float Glass Products on their Strength and Fatigue Behavior” Proc. XIX Int'l Cong. Glass Edinburgh 2001
- Gulati, S. T. Roe, T Vitkala, J. “Importance of Edge Finish on Thermal Tempering” Proc. Glass Processing Days, 2001 Tampere 2001
- DIN Standard #52292 on Determination of Bending Strength of Glass Discs 1984
- Ritter, J. E. et al. “Appraisal of Biaxial Strength Testing” J. Noncrystalline Solids 38 39 1980
- Gulati, S. T Powell, W. R. “Mechanical Reliability of 8m class ULE Glass Telescope Blanks during Manufacturing” Proc. SPIE 2536 1995
- Gulati, S. T. et al. “Measurement of Biaxial Strength of New vs. Used Windshields” SAE Paper No. 2000-01-2721 Int'l Body Engg Conf. Detroit 2000
- Gulati, S. T. Helfinstine, J. D. Roe, T. A. “Strength Degradation of Automotive Windshield from Manufacturing to On-Road Service,” Proc. XIX Int'l Cong. Glass Edinburgh 2001
- Timoshenko, S. P Woinowsky-Krieger, S. “Theory of Plates and Shells” Second McGraw-Hill New York 1959
- Way, S. “Bending of Circular Plates with Large Deflection” Trans. ASME 56 1934
- Young, W. C. “Roark's Formulas for Stress and Strain” Sixth McGraw-Hill New York 1989
- Reissner, E. “The Effect of Transverse Shear Deformation on the Bending of Elastic Plates” J. App. Mechanics 12 1945
- Gulati, S. T Essenburg, F. “On the Contact of Two Axisymmetrtc Plates” J. App. Mechanics 33 1966
- Kerper, M. J Scuderi, T. G. “Modulus of Rupture in Relation to Fracture Pattern” J. Am. Ceram. Soc. 43 1964
- McLellan, G. W Shand, G. B. “Glass Engineering Handbook” Third McGraw-Hill New York 1984
- Burgreen, D. “Elements of Thermal Stress Analysis” first C.P. Press Jamaica, New York 1971