Durability of bonded FRP-to-steel jointsEffects of moisture, de-icing salt solution, temperature and FRP type

This paper investigates the effects of environmental ageing on the mechanical response of adhesively bonded double-lap shear joints made of steel and CFRP or GFRP adherents. One hundred and ninety-two specimens, 84 joints and 108 material coupons, were aged for up to three years in various environme...

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Veröffentlicht in:Composites. Part B, Engineering Jg. 119; S. 153
Hauptverfasser: Heshmati, Mohsen, Haghani Dogaheh, Reza, Al-Emrani, Mohammad
Format: Journal Article
Sprache:Englisch
Veröffentlicht: 15.06.2017
Schlagworte:
Environmental degradation
FRP-steel bonded joints
Mechanical properties
Polymer-matrix composites (PMCs)
ISSN:1359-8368
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Zusammenfassung:This paper investigates the effects of environmental ageing on the mechanical response of adhesively bonded double-lap shear joints made of steel and CFRP or GFRP adherents. One hundred and ninety-two specimens, 84 joints and 108 material coupons, were aged for up to three years in various environments including (i) immersion in distilled water at 20 °C and 45 °C, (ii) immersion in de-icing salt solution at 20 °C and 45 °C and (iii) exposure to 95% relative humidity at 45 °C. In general, immersion at 45 °C resulted in noticeably greater strength reductions at both material and joint level. While the strength and stiffness of the joints made of GFRP material underwent significant reductions, the CFRP/steel joints were affected to a considerably smaller degree. FE simulations showed the impact of the permeability of FRP adherents and moisture distribution at the FRP/adhesive interface on the integrity and strength of the joints. The joint-level results are compared with the most relevant durability data in the literature.
ISSN:1359-8368
DOI:10.1016/j.compositesb.2017.03.049