Modelling the Environmental Degradation of the Interface in Adhesively Bonded Joints using a Cohesive Zone Approach

Modelling the static response of unaged adhesively bonded structures

“…Similarly, the first shear elastic stiffness (K s ) and the second shear elastic stiffness (K t ) were calculated as the shear modulus (G) divided by the cohesive element thickness, where G was calculated as E/2(1+ν). From tensile tests of bulk adhesive, it was found that the tensile strength ranged from 49-53 MPa [15], while the Young's modulus ranged from 2000-2300 MPa [13,15] and the Poisson ratio was 0.4 [13].…”

“…Many sets of CZM properties can predict the failure load of a joint [13], however these will not all provide the correct damage evolution and thus their use is questionable. This paper presents experimental and numerical studies on Al 2024-T3 monolithic single lap joints (MSLJ) and laminated doublers, both bonded using FM 73M OST, to calibrate and validate CZM properties respectively, using both the load and the damage to provide a unique set of CZM parameters.…”

The static and fatigue responses of aged metal laminate doublers joints under tension loading

“…[3] The plasticization reduces the stiffness and tensile strength [4][5][6][7][8][9] and glass transition temperature [10][11][12]. The stiffness and the tensile strength continue to decrease with increasing moisture content reaching a plateau as the moisture saturation level is approached.…”

“…[17] Water then decreases the mechanical properties of adhesive (tensile strength and Young's modulus) [4][5][6][7][8][9], may (depending on surface treatment) cause corrosion in the substrate at the interface [18][19][20], and hydration of strong metal oxides [21,22]. The consequences of the diffused water in the adhesive joint are reductions in the joint strength, both static [23][24][25][26][27][28] and fatigue [29][30][31][32].…”

Investigating the static response of hybrid fibre–metal laminate doublers loaded in tension

“…The failure of the butts was modelled using a cohesive zone model. Table 2 shows the elastic properties for Al 2024-T3 both in the longitudinal and in the transverse direction [14] and for adhesive FM 73M [16]. The longitudinal direction corresponds to the rolling direction during the manufacture of aluminium sheet and the transverse direction is perpendicular to the rolling direction.…”