Given that CFRP and steel structures that are adhered to epoxy resins usually require high temperatures, the influence of the epoxy resins' thermomechanical properties on the interface behavior of CFRP/steel lap was addressed. The researchers chose epoxy adhesives with different glass transition temperatures to test at 25°, 55°, 70°, and 90°. The self-developed HJY-4105 high-tenacity epoxy resin structural adhesive (HJY) was compared with two commercial adhesives using static tensile tests on double-lap joints. The structural behaviors in load-carrying capacity, load-displacement relationship, and strain distribution at the interface were obtained. The effect of temperature on the interfacial stress transfer mechanism and bond-slip modeling was also investigated. The self-developed HJY adhesive showed the best mechanical properties at high temperatures, and the loading capacity of test specimens using HJY adhesive increased with temperature. The test specimens using Sikadur-30CN Adhesive (SIKA30) had the highest loading capacity at 55°C. The loading capability of specimens using LICA-100 A/B Adhesive (LICA) decreases with increasing temperature. As the temperature approached the glass transition temperature (Tg) of the adhesive, the shear strength, peak interfacial shear stress, and shear stiffness of the adhesive decreased while the ductility increased. Furthermore, the strain distribution was modeled more accurately using third-order polynomials, and the fit-based strain analytical results provided strong support for a more in-depth study of the mechanical properties of the interface.
YuanXZhangZMuX, et al.Recent progress on interface characterization methods of carbon fiber reinforced polymer composites. Chem Eng J2024; 499: 156220.
2.
LiuJCaiMGuoY, et al.The static and dynamic mechanical properties analysis of ramie/carbon fiber-reinforced composites. Polym Compos2024; 45(7): 6575–6587.
3.
HeJFengSVasdravellisG, et al.Cyclic inelastic performance evaluation of locking bolt demountable shear connectors in steel-concrete composite structures. Eng Struct2024; 318: 118690.
4.
XinHLiuYMosallamA, et al. Evaluation on material behaviors of pultruded glass fiber reinforced polymer (GFRP) laminates. Compos Struct2017; 182: 283–300.
5.
TanXAbu-ObeidahABaoY, et al.Measurement and visualization of strains and cracks in CFRP post-tensioned fiber reinforced concrete beams using distributed fiber optic sensors. Autom ConStruct2021; 124: 103604.
6.
ZhaoXZhangL. State-of-the-art review on FRP strengthened steel structures. Eng Struct2007; 29(8): 1808–1823.
7.
TengJGYuTFernandoD. Strengthening of steel structures with fiber-reinforced polymer composites. Journal of Constructional Steel Research2012; 78: 131–143.
8.
BelarbiAAcunB. FRP systems in shear strengthening of reinforced concrete structures. Procedia Eng2013; 57: 2–8.
9.
de WaalLFernandoDNguyenV, et al.FRP strengthening of 60 year old pre-stressed concrete bridge deck units. Eng Struct2017; 143: 346–357.
10.
LiXDengJWangY, et al.RC beams strengthened by prestressed CFRP plate subjected to sustained loading and continuous wetting condition: time-dependent prestress loss. Constr Build Mater2021; 275: 122187.
11.
HuLFengP. Prestressed CFRP-reinforced steel columns under axial and eccentric compression. Compos Struct2021; 268: 113940.
12.
MaYGuoZWangL, et al. Probabilistic life prediction for reinforced concrete structures subjected to seasonal corrosion-fatigue damage. Journal of Structural Engineering2020; 146(7): 04020117.
13.
HeJWangZVasdravellisG, et al. Fatigue tests and fatigue-life prediction models for hybrid welded-bolted demountable shear connectors. International Journal of Fatigue2023; 175: 107826.
14.
HaghaniR. Analysis of adhesive joints used to bond FRP laminates to steel members – a numerical and experimental study. Constr Build Mater2010; 24(11): 2243–2251.
15.
TanXMahjoubiSZouX, et al.Metaheuristic inverse analysis on interfacial mechanics of distributed fiber optic sensors undergoing interfacial debonding. Mech Syst Signal Process2023; 200: 110532.
16.
LuoYHeJLuN, et al. Stress intensity factor of double fatigue cracks at the rib-to-diaphragm connection in orthotropic steel decks. Journal of Constructional Steel Research2025; 232: 109660.
17.
HeJXianG. Debonding of CFRP-to-steel joints with CFRP delamination. Compos Struct2016; 153: 12–20.
18.
XiaSTengJ. Behaviour of FRP-to-steel bonded joints. Hong Kong, China: International Institute for FRP in Construction (IIFC), 2005, pp. 411–418.
19.
BressonGJumelJShanahanM, et al.Statistical aspects of the mechanical behaviour a paste adhesive. Int J Adhes Adhes2013; 40: 70–79.
20.
MichelsJWidmannRCzaderskiC, et al.Glass transition evaluation of commercially available epoxy resins used for civil engineering applications. Composites Prat B: Engineering2015; 77: 484–493.
21.
ZhangYChuYHeJ, et al. Prediction of temperature zoning for steel-concrete composite beams based on meteorological parameters in China. Structures2024; 61(4).
22.
KeLLiCHeJ, et al. Enhancing fatigue performance of damaged metallic structures by bonded CFRP patches considering temperature effects. Materials & Design2020; 192: 108731.
23.
NguyenTBaiYZhaoX, et al.Mechanical characterization of steel/CFRP double strap joints at elevated temperatures. Compos Struct2011; 93(6): 1604–1612.
24.
WangHWuGPangY, et al.Experimental study on the bond behavior between CFRP plates and steel substrates under fatigue loading. Compos B Eng2019; 176: 107266.
25.
KobayashiSTakedaNOgiharaS, et al. Damage Mechanics Analysis of Transverse Cracking Evolution in Delaminated CFRP Laminates. J Reinforc Plast Compos1999; 18(15): 1360–1366.
26.
Fernando. Bond behaviour and de-bonding failures in CFRP strengthened steel Members, Hong Kong: Hong Kong Polytechnic University, 2010.
27.
LiuHBAl-MahaidiRZhaoX. Experimental study of fatigue crack growth behaviour in adhesively reinforced steel structures. Compos Struct2009; 90(1): 12–20.
28.
LiuHXiaoZZhaoXL, et al.Prediction of fatigue life for CFRP strengthened steel plates. Thin-Walled Struct2009; 47(10): 1069–1077.
29.
WuCZhaoXAl-MahaidiR, et al.Fatigue tests of cracked steel plates strengthened with UHM CFRP laminates. Adv Struct Eng2012; 15: 1801.
30.
DengJFeiZLiJ, et al.Fatigue behaviour of notched steel beams strengthened by a self-prestressing SMA/CFRP composite. Eng Struct2023; 274: 115077.
31.
AlemdarFGangelRMatamorosA, et al.Use of CFRP overlays to repair fatigue damage in steel plates under tension loading. Journal ofComposites for Construction, 2013. 4013052.
32.
LiCKeLHeJ, et al.Effects of mechanical properties of adhesive and CFRP on the bond behavior in CFRP-strengthened steel structures. Compos Struct2019; 211: 163–174.
33.
FernandoDYuTTengJG. Behavior of CFRP laminates bonded to a steel substrate using a ductile adhesive. J Compos Construct2014; 18(2): 1–20.
34.
YUTFernandoDTengJ, et al.Experimental study on CFRP-to-steel bonded interfaces. Compos B Eng2012; 43(5): 2279–2289.
35.
WuCZhaoXHui DuanW, et al.Bond characteristics between ultra high modulus CFRP laminates and steel. Thin-Walled Struct2012; 51: 147–157.
36.
NarmashiriKRamli SulongNJumaatM. Failure analysis and structural behaviour of CFRP strengthened steel I-beams. Constr Build Mater2012; 30: 1–9.
37.
Al-ShawafAAl-MahaidiRZhaoX. Effect of elevated temperature on bond behaviour of high modulus CFRP/steel double-strap joints. Aust J Struct Eng2009; 10(1): 63–74.
38.
HeJXianGZhangY. Effect of moderately elevated temperatures on bond behaviour of CFRP-to-steel bonded joints using different adhesives. Constr Build Mater2020; 241: 118057.
39.
KeLLiCHeJ, et al.Effects of elevated temperatures on mechanical behavior of epoxy adhesives and CFRP-steel hybrid joints. Compos Struct2020; 235: 111789.
40.
LiangXWangWYHuLL, et al.Experimental and numerical study on high-temperature performance of prestressed CFRP-reinforced steel columns. Eng Struct2024; 301: 117347.
41.
ChenZYLiuYHeJ, et al.Prestressing effect of self-bonded prestressed CFRP for repairing steel plates with defects. Structures2025; 76: 108994.
42.
NguyenT-CBaiYZhaoX-L, et al. Curing effects on steel/CFRP double strap joints under combined mechanical load, temperature and humidity. Constr Build Mater2013; 40: 899–907.
43.
Al-MosaweAAl-MahaidiRZhaoX. Effect of CFRP properties, on the bond characteristics between steel and CFRP laminate under quasi-static loading. Constr Build Mater2015; 98: 489–501.
