What question did this study set out to answer?

Quantify how environmental ageing of structural adhesives translates into the overall load-bearing performance of pretensioned hybrid joints compared to bonded and bolted references.

August 16, 2026International Journal of Adhesion and AdhesivesOpen Access

Environmental ageing of pretensioned hybrid joints

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Authors

MVMorten Voß TETobias Evers AMAdrian Mertens

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Overview

Experimental study reveals that pretensioned hybrid joints retain peak strength despite adhesive degradation during environmental ageing, indicating load-path-dependent mechanical response.

Key Points

Quantify how environmental ageing of structural adhesives translates into the overall load-bearing performance of pretensioned hybrid joints compared to bonded and bolted references.
Tested 350 joint specimens across 70 distinct series combining polyurethane (PUR) or epoxy (EPX) adhesives with organically coated or hot-dip galvanised steel.
Subjected specimens to accelerated climatic cycling or salt-spray exposure for up to 6 weeks across 80 condition cells with five nominal replicates.
Performed 70 bulk tensile tests and 28 dynamic mechanical analyses to evaluate bulk material properties alongside structural joint tests.
Climatic exposure reduced bonded EPX galvanised lap-shear strength from 14.86 to 0.40 MPa and fracture energy from 38.9 to 1.1 J, whereas matched hybrid joint strength remained steady (22.42 to 22.55 MPa).
Coated PUR hybrid joints exposed to salt spray showed an increase in peak strength from 16.04 to 19.91 MPa and fracture energy from 55.3 to 141.0 J.
Bolted-only references maintained stable peak strength throughout exposure, demonstrating that hybrid joint capacity depends on the active load path rather than bulk adhesive degradation alone.

Cite This Study

Voß et al. (2026) studied this question.

synapsesocial.com/papers/6a8178fcf2fb91fc834ac38f https://doi.org/10.1016/j.ijadhadh.2026.104435

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August 16, 2026International Journal of Adhesion and AdhesivesOpen Access

Environmental ageing of pretensioned hybrid joints

View Full Paper

Ask AI

Bookmark

Authors

MVMorten Voß TETobias Evers AMAdrian Mertens

Discussion

Member takes

Overview

Experimental study reveals that pretensioned hybrid joints retain peak strength despite adhesive degradation during environmental ageing, indicating load-path-dependent mechanical response.

Key Points

Quantify how environmental ageing of structural adhesives translates into the overall load-bearing performance of pretensioned hybrid joints compared to bonded and bolted references.
Tested 350 joint specimens across 70 distinct series combining polyurethane (PUR) or epoxy (EPX) adhesives with organically coated or hot-dip galvanised steel.
Subjected specimens to accelerated climatic cycling or salt-spray exposure for up to 6 weeks across 80 condition cells with five nominal replicates.
Performed 70 bulk tensile tests and 28 dynamic mechanical analyses to evaluate bulk material properties alongside structural joint tests.
Climatic exposure reduced bonded EPX galvanised lap-shear strength from 14.86 to 0.40 MPa and fracture energy from 38.9 to 1.1 J, whereas matched hybrid joint strength remained steady (22.42 to 22.55 MPa).
Coated PUR hybrid joints exposed to salt spray showed an increase in peak strength from 16.04 to 19.91 MPa and fracture energy from 55.3 to 141.0 J.
Bolted-only references maintained stable peak strength throughout exposure, demonstrating that hybrid joint capacity depends on the active load path rather than bulk adhesive degradation alone.

Cite This Study

Voß et al. (2026) studied this question.

synapsesocial.com/papers/6a8178fcf2fb91fc834ac38f https://doi.org/10.1016/j.ijadhadh.2026.104435

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