Load sharing in single-lap bonded/bolted composite joints. Part I: Model development and validation

Load sharing in single-lap bonded/bolted composite joints. Part II: Global sensitivity analysis

“…The corresponding drop in the bonded joint stiffness means that once bearing contact is established, the bolt is able to take up a significantly higher percentage of any additional load than it would if the adhesive were still elastic To demonstrate points (a) and (b), consider the example of a bonded joint with a hole. The geometric parameters from part I of the paper [14] are assumed, as well as an idealized bilinear behavior for the adhesive (E = 600 MPa, m = 0.42, r YT = 10 MPa, H = 34.5 MPa). During tensile loading of this joint, the relative displacement between the holes in the top and bottom substrates or hole closure is what allows the substrates to ''grip'' a hypothetical bolt.…”

“…The load case of interest was uniaxial tensile loading. Although in reality a doubler would be bonded to the grip region of each substrate to permit installation in a tensile testing machine, it was shown in part I [14] that ignoring this region altogether in the model and assuming a clamped boundary condition at the grip edge is an adequate representation. A schematic of this configuration is shown in Fig.…”

“…A detailed computational model of a single-bolt, single-lap bonded/bolted composite joint, called the Global Hybrid Joint Method (GHJM), was developed in part I of the paper [14]. This model follows an equivalent single layer (ESL) approach with the laminates modeled as shells.…”

“…A variance-based GSA method was chosen for the sensitivity analysis as this permits consideration of general nonlinear, nonmonotic models without making underlying assumptions about Table 1 Cytec 5320 CFRP tape properties [14]. their response characteristics.…”

“…A quantitative assessment was thus made of the importance of the various bonded/bolted joint design parameters in load sharing, including the effects of interactions. The subject of the analysis was the computational model presented in part I of the paper [14].…”