PSI - Issue 16

Róbert Beleznai et al. / Procedia Structural Integrity 16 (2019) 59–66 Róbert Beleznai et al. / Structural Integrity Procedia 00 (2019) 000 – 000

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The applied properties for the analysis, based on the papers by Borók (2016) and Cutrell (2010), are shown in Table 4. The finite element mesh is created for the representative volume element (RVE) where the polyurethane foam, the cane fibres and the air in the hollow structure of the cane are also considered (Fig. 5).

Table 4. Properties for the Thermal Analysis. Properties Cane

Polyurethane

Air

Thermal conductivity, W/mK

0.055 2700

0.025 1500

0.02603

Specific heat, J/kgK

1007

Density, kg/m 3

225

30

1.1881

Fig. 5. Finite element model for the thermal analysis of the composite material.

To analyse the thermal insulation capability of the composite, the temperature boundary conditions are used. The global temperature of 293 K is defined as the initial condition and the temperature of 353 K as the heat load is defined at one side of the RVE. The transient time of 1000 s is defined for heat transfer; the analysis is solved in 1000 time steps. The temperature field and heat flux are calculated at the end of the transient period. The obtained results are illustrated in Fig. 6.

Temperature field

Heat flux

Fig. 6. Temperature field and heat flux at the end of the transient period of the heat transfer.