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Tensile and Shear Creep Behavior of Structural Adhesives: Experiments and Modeling
Gilda Daissè1, Bilen Emek Abali2, Roman Wan-Wendner1,3,4
1Christian Doppler Laboratory, University of Natural Resources and Life Sciences Vienna, Peter-Jordanstr. 82, Vienna, 1190 Austria.
Applied Composite Materials
|March 28, 2024
Summary
Higher curing temperatures reduce creep in structural adhesives, improving their long-term performance and mechanical properties. This study investigated tensile and shear creep behavior under various curing conditions.
Area of Science:
- Materials Science
- Polymer Engineering
- Structural Engineering
Background:
- Structural adhesives are critical for connecting elements, offering excellent stress transfer.
- In-situ applications often involve incomplete thermal curing, leading to variable mechanical performance over time.
- Post-curing effects on the long-term behavior of these adhesives are not well-understood.
Purpose of the Study:
- To investigate the tensile and shear creep behavior of structural adhesives.
- To evaluate the influence of curing conditions on long-term adhesive performance.
- To understand how different curing protocols affect material properties under sustained load.
Main Methods:
- Experimental characterization of two commercial structural adhesives.
- Application of three distinct curing and post-curing protocols to mimic in-situ conditions.
- Short-term and long-term creep tests (tensile and shear).
Main Results:
- Adhesives cured at higher temperatures exhibited reduced creep deformation.
- Curing conditions significantly influence the long-term mechanical behavior.
- The generalized Kelvin model effectively described the creep data.
Conclusions:
- Optimizing curing temperatures is crucial for enhancing the long-term durability of structural adhesives.
- Higher temperature curing leads to improved resistance to creep.
- The generalized Kelvin model provides a framework for predicting long-term creep behavior.
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