PSI - Issue 37

J. Henriques et al. / Procedia Structural Integrity 37 (2022) 25–32 J. Henriques et al. / Structural Integrity Procedia 00 (2021) 000 – 000

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Table 2. Summary of FEMU convergence parameters. Specimen Z ( χ ) IT S IT F

exp (N)

F num (N)

F

01 02 03 04 05 06 07

4.894×10 -4 9.181×10 -4 2.195×10 -4 1.543×10 -4 3.315×10 -4 1.190×10 -4 9.555×10 -4

2.213×10 -2 3.031×10 -2 1.482×10 -2 1.243×10 -2 1.822×10 -2 1.091×10 -2 3.093×10 -2

1.544×10 -5 1.228×10 -6 1.983×10 -5 1.423×10 -6 3.289×10 -6 1.356×10 -5 4.894×10 -5

335.0 366.7 120.6 367.7 327.6 148.9 273.4

335.0 366.7 120.6 367.7 327.6 148.9 273.4

Fig. 3. Convergence study for identified parameters: (a) E R ; (b) E T ; (c) ν RT ; (d) G RT .

3.2. Experimental and numerical full-field deformation maps with identified parameters The difference between experimental full-field strain measurements and numerical strain results are minimized. Fig. 4 shows the experimental DIC strain fields in comparison to the final calibrated numerical strain fields for one of the specimens under analysis. Furthermore, the difference between these two strain fields normalized by the maximum value of strain of its correspondent component is also presented. As expected, in the difference fields it is possible to observe the annual growth rings structure of wood, being a major component of these, due to the numerical homogeneous modelling of wood used in this work.