On the Response of a Sandwich Panel with a Bilinear Core

Improved high order analysis of sandwich beams by considering a bilinear elasto-plastic behavior of core: An analytical and experimental investigation

“…Sadighi and Jedari Salami [5] studied the quasi static and low velocity impact behaviors of elastomeric and crushable foams experimentally, and investigated the dependence of stress-strain curve upon rate of loading. Mercado and Sikarskie [6] investigated the bending response of a sandwich panel by considering a bilinear shear stressstrain relation of the core. In their work, the sandwich panel follow the classical sandwich theory, therefore, the height of the panel is kept fixed and it is inconsistent with the purpose of sandwich applications.…”

Failure mode prediction for composite structural insulated panels with MgO board facings

“…Trial FE analyses indicated that the low stiffness of the core leads to significant deformations and so geometric nonlinearity has been taken into account as well. Importance of nonlinear approach has been also reported in recent research [19,21,35]. All tested samples have lost their load-bearing capacity with the initiation of damage, so failure was modelled by ductile damage initiation criterion only, without defining damage evolution behaviour.…”

“…Growing popularity of sandwich structures led to numerical implementation of shell theory formulations appropriate for these kinds of structures [29][30][31][32][33][34][35]. However, since the FEM model has to be able to predict localised failure modes, core was modelled with solid elements, based on similar research [5][6][7][8][9][10][11][22][23][24].…”

Finite Element Analysis of Loading Area Effect on Sandwich Panel Behaviour Beyond the Yield Limit

“…In this research a first-order idealized core material property module suggested by (Mercado, Sikarskie, 1999) is used. This first-order idealized model, also called the bi-linear model, describes the material properties of the core with the stress strain curve as shown on Figure 6a and 6c.…”

“…Knowing that the core could not carry additional load after yield, this increasing load carrying capacity of post yield sandwich structure initiates the postulation that the additional shear load was transferred to the face sheets. To account for the above-mentioned phenomenon, (Mercado et al, 1999) developed a higher order theory by including a bilinear core material module. This theory yields a fairly accurate prediction on the deflection of a foam cored sandwich structure in four point bending (Mercado et al, 2000).…”