(a) Load-displacement curves of 4 pt. for three different chevron notched beams (CNB) with longitudinal orientation. The adsorbed energy for each bar is reported. (b) SEM images of fracture surface of failed CNB under flexural loading. (c) Magnification of the area highlighted in (b), showing holes left by pulled out fibers. (d) Magnification of the area highlighted in (c), showing length of the pulled out fibers.