Flexural behavior of composite structural insulated panels with magnesium oxide board facings

Abstract

The current report is devoted to the flexural analysis of a composite structural insulated panel (CSIP) with magnesium oxide board facings and expanded polystyrene (EPS) core, that was recently introduced to the building industry. An advanced nonlinear FE model was created in the ABAQUS environment, able to simulate the CSIP’s flexural behavior in great detail. An original custom code procedure was developed, which allowed to include material bimodularity to significantly improve the accuracy of computational results and failure mode predictions. Material model parameters describing the nonlinear range were identified in a joint analysis of laboratory tests and their numerical simulations performed on CSIP beams of three different lengths subjected to three- and four-point bending. The model was validated by confronting computational results with experimental results for natural scale panels; a good correlation between the two results proved that the proposed model could effectively support the CSIP design process.

Edgewise Compressive Behavior of Composite Structural Insulated Panels with Magnesium Oxide Board Facings

“…It is worth noting that even though the number of samples in each laboratory test was quite limited, the covered spectrum of geometries and loading conditions was wide enough to observe varied responses that were successfully reproduced in numerical simulations. Moreover, the proposed numerical approach was used with the same set of material parameter values to successfully reproduce CSIP failure under flexure [ 27 ], which further improves its reliability.…”

“…Based on the successful validation performed in this study, the FE model can be considered feasible for CSIP compression simulations. As the previous research [ 27 ] has proven it is suitable for flexural analysis, meaning that it can be applied to different loading conditions. Therefore, the proposed approach can be considered a reliable and robust aid for CSIP design.…”

“…In total, six numerical test assemblies were created using ABAQUS software [ 29 ] (version 6.11, Dassault Systèmes, Providence, RI, USA). The computations were supplemented by an author’s procedure, implemented to account for dependence of material response from stress state [ 27 ].…”

“…A summary of characteristic SSV values and corresponding material parameter values used in the analysis is shown in Table 2 . The majority of presented data were established in course of an experimental investigation, supplemented by a literature study and a parameter identification analysis as an extensive part of previous research [ 25 , 26 , 27 ].…”

“…The numerical analysis produced qualitatively acceptable results; however, the samples’ stiffness and strength were considerably underestimated. Quite recently, a refined description of the bimodular material model was proposed and positively validated [ 27 ]. As a result, a notable improvement of similarity between numerical and experimental curves, and accuracy of failure mode prediction was achieved for flexural behavior.…”