This paper was intended to investigate the strength of adhesive and welded connections to be used in a dynamic message sign (DMS). The tensile strength and shear strength were studied for both of the adhesive and welded specimens. A number of tensile specimens and shear specimens with variations in width and temperature were tested until failure according to the ASTM D638 and ASTM D1002, respectively. The specimens with a range of width from 13 mm to 38 mm were conditioned with temperatures between −56.67 °C and 93.33 °C. The effects of temperature and width on each of the strengths were evaluated by analysing the testing data in a graphical and statistical manner. As expected, all the tests revealed that the welded specimens have significantly higher strength compared to the adhesive specimens in tensile and shear loadings. For the adhesive specimens, due to the increment of temperature, the highest increments were found to be 31.9% and 30.4%. In addition to the tests, Response Surface Metamodels (RSMs) and practical design equations were developed with regression analysis of the testing data, so as to predict tensile and shear stresses of both adhesive and welded specimens in an efficient way. 3D plots generated from the RSMs showed a higher effect of the temperature and width on the ultimate tensile and shear strength for both adhesive and welded specimens, and the practical design equations were founded to be more reliable for the overall tensile and shear stress prediction compared to the RSMs.
|Journal||Engineering Failure Analysis|
|State||Published - Nov 2021|
Bibliographical noteFunding Information:
The contents of this paper reflect the views of the authors, who are responsible for the facts and the accuracy of the data presented herein. The authors wish to acknowledge the support provided by Dan Bierschbach, John Syrstad, Toby Pulscher, Jeff Haliburton and Eric Johns at Daktronics for their financial support, their valuable suggestions and insight for this project. This research was funded by Daktronics and United State Department of Transportation through Mountain-Plains Consortium - University Transportation Center. This paper does not constitute a standard, specification or regulation.
© 2021 Elsevier Ltd
- Dynamic message sign
ASJC Scopus subject areas
- Materials Science (all)
- Engineering (all)