Issue 54

B. Bartolucci et alii, Frattura ed Integrità Strutturale, 54 (2020) 249-274; DOI: 10.3221/IGF-ESIS.54.18

Figure 7: Fracture toughness K IC values (kPa·m ⁰⸱⁵ ) for softwood species in TR (a), RT (b), TL (c), RL (d), LT (e) and LR (f) directions.

Figure 8: Scatterplots relating density to fracture toughness. Top SW-Softwood. Bottom HW-Hardwood. Black dots: fracture toughness RL direction; Dark grey dots: TL direction; Light grey dots: RT direction and White dots: TR direction. The labels closed to the data points are referred to the papers ID reported in Tab. 2.

Modulus of Elasticity As expected, MOE values in longitudinal (E L ) direction are much higher than those in the radial (E R ) and tangential (E T ) directions, as reported in Figs. 9 and 10. This is a direct consequence of the material orthotropy. In most of the examined hardwoods, the MOE in longitudinal direction is at least one order of magnitude larger than that in radial and tangential directions.

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