Acta Mechanica Slovaca 2023, 27(1):6-14 | DOI: 10.21496/ams.2023.010

Experimental Study of the Impact of Notches Made in the Front Edge of Adherends on the Properties of Static and Fatigue Strength of Adhesive Joints

Andrzej Kubit ORCID...1, *, Władysław Zielecki ORCID...1, Wojciech Berezowski ORCID...2, Ryszard Perłowski ORCID...1, Katarzyna Łabno3, Tomáš Katrňák4
1 Department of Manufacturing and Production Engineering, Rzeszow University of Technology, al. Powst. Warszawy 8, 35-959 Rzeszów, Poland
2 Department of Automation and Robotics, State University of Applied Sciences in Krosno, Rynek 1, 38-400 Krosno, Poland
3 Grupa Azoty, ul. Kwiatkowskiego 8, 33-101 Tarnów, Poland
4 Institute of Aerospace Engineering, Brno University of Technology, Antonínská 548/1, 601 90 Brno, Czech Republic

This paper presents the effect of simple structural changes consisting in making notches on the edge of adherends on the static and fatigue properties of adhesive joints. The study is based on the set of experimental static strength tests of the single lap shear adhesive joints. It has been shown that a slight increase in load capacity is possible by using adhesive-filled notches. However, this structural modification leads to an increase in the standard deviation of test results. Based on the fatigue strength tests done at the limit number of cycles equal to 2×106, it was shown that the use of notches on the front edge of adherends, which are filled with adhesive, can significantly increase the fatigue lifetime of the joint. The effect is shown in the area of low-cycle fatigue, where for fatigue stress with a maximum value of 11.5 MPa, an increase in the average value of fatigue lifetime by 481.5% was shown for joints with notches. On the basis of fractography analyses using SEM microscopy, it was shown that the positive effect of the notches is caused by the absorption of some energy by the adhesive filling the notches, due to the increased susceptibility of the adhesive in this area to elastic deformations.

Keywords: Adhesion; adhesive joints; fatigue strength; high cycle fatigue; S-N curves

Received: January 31, 2023; Revised: February 17, 2023; Accepted: February 20, 2023; Published: March 24, 2023  Show citation

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Kubit, A., Zielecki, W., Berezowski, W., Perłowski, R., Łabno, K., & Katrňák, T. (2023). Experimental Study of the Impact of Notches Made in the Front Edge of Adherends on the Properties of Static and Fatigue Strength of Adhesive Joints. Acta Mechanica Slovaca, 27(1), 6-14. doi: 10.21496/ams.2023.010
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