Related Experiment Video
Updated: Jun 3, 2025
09:06
Evaluation of the Curing of Adhesive Systems by Rheological and Thermal Testing
Published on: July 3, 2020
7.2K
Evaluation and Characterization of Functionally Graded Adhesive Joints: Experimental and Numerical Analyses
Yanan Zhang1, Pedro Gálvez2, Miguel Angel Martínez3
1Soete Laboratory, Faculty of Engineering and Architecture, Ghent University, B-9052 Ghent, Belgium.
Polymers
|January 8, 2025
Summary
This study shows that graded epoxy adhesive joints significantly enhance shear strength compared to single joints. The SikaPower®-1548-1511-1548 configuration notably boosts joint strength and reduces stress concentrations.
Area of Science:
- Materials Science
- Mechanical Engineering
- Polymer Science
Background:
- Epoxy resins are advanced materials for adhesive bonding, replacing traditional mechanical joints.
- Innovative adhesives like SikaPower®-1511 and SikaPower®-1548 offer enhanced properties for engineering applications.
Purpose of the Study:
- To evaluate the performance of two epoxy adhesives, SikaPower®-1511 and SikaPower®-1548, in various graded configurations.
- To investigate the thermal curing behavior, strength performance, and interfacial stress distribution of single and graded adhesive joints.
Main Methods:
- Differential scanning calorimetry (DSC) and Fourier transform infrared spectroscopy (FTIR) for thermal analysis.
- Shear tests and finite element simulations for strength and stress analysis.
- Evaluation of four adhesive configurations, including single lap joints and graded joints.
Main Results:
- SikaPower®-1548 exhibits a slower cure rate and higher shear limit load (9 MPa) than SikaPower®-1511 (4 MPa).
- The 1548-1511-1548 graded configuration increased shear strength by 32.20% and reduced peel and shear stress intensities.
- The 1511-1548-1511 graded configuration showed a slight decrease in shear strength (8.86%) compared to SikaPower®-1511.
Conclusions:
- Graded adhesive joints offer significant advantages over single joints in reducing stress concentrations and improving overall joint strength.
- Epoxy resins demonstrate substantial potential for advanced engineering applications, with graded designs providing enhanced performance.
- This research offers a theoretical basis and technical guidance for designing effective graded adhesive joints.
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