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

Abstract

Abstract. Sandwich panels are readily used in civil engineering due to their high strength to weight ratio and the ease and speed of assembly. The idea of a sandwich section is to combine thin and durable facings with a light-weight core and the choice of materials used allows obtaining the desired behaviour. Panels in consideration consist of MgO (magnesium oxide) board facings and expanded polystyrene core and are characterized by immunity to biological corrosion, a high thermal insulation and a relatively low impact on environment. Customizing the range of panels to meet market needs requires frequent size changes, leading to different failure modes, which are identified in a series of costly full-scale laboratory tests. A nonlinear numerical model was created with a use of a commercial ABAQUS code and a user-defined procedure, which is able to reproduce observed failure mechanisms; its parameters were established on the basis of small-scale tests and numerical experiments. The model was validated by a comparison with the results of the full-scale bending and compression tests. The results obtained were in satisfactory agreement with the test data.

MgO-Based Board Materials for Dry Construction Are a Tool for More Sustainable Constructions—Literature Study and Thermal Analysis of Different Wall Compositions

“…Zheng et al [36] built a chipboard structure from magnesium cement to test its mechanical strength, water resistance, thermal stability, and non-flammability. The results showed that this board had excellent properties.…”

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

“…A literature study was also used to assume Poisson's ratios, υ [40,41], as well as angles of friction, β, and dilation angles, ψ [42,43]. More detailed reasoning behind the specified data can be found in research presented in [33][34][35]. The material description was developed further, as a part of the current study, with the addition of SSV value corresponding to the core shear stress-state in the elastic range.…”

“…It was noted that both EPS and MgO board exhibit distinctly different behavior in compression and tension in all ranges: elastic, plastic, and failure, indicating at the substantial influence of the material bimodularity. An initial FE solution incorporating material bimodularity effect was created and proved to capture CSIP flexural behavior quite well; however, it failed to predict the correct failure pattern in some cases [35]. It was determined that the correct prediction of failure initiation location strongly depends on (1) the accuracy of elastic core response in areas where stress-state transits from compression to shear (e.g.…”