“…Normal stiffness 𝑘 9,E 13.5 [18] , 82 [7] , 180 [6] , 550 [20] N/mm ' Shear stiffness 𝑘 O,E 5.9 [18] , 36 [7] , 80 [6] , 210 [20] N/mm ' Tensile strength 𝑓 /,E 0.1 [18,20] , 0.2 [15] , 0.25 [7] , 0.29 [6] , (0.3-0.9) [22] , 7.6 [24] N/mm * Tensile fracture energy (Mode I) 𝐺 /,E 0.01 [7,20,24] , 0.0115 [23] , 0.012 [15] , 0.02 [6] , (0.005 -0.02) [22] N/mm…”