As shown in Fig. 13.12, the stresses are tensile through the 0-degree layers and compressive through the 90-degree layers. It is observed that the residual stress in almost all layers decreases by increasing the CNF content. In the third layer, the amount of residual stress increases. Generally, residual stress has more reduction in the layers that have more residual stress. The maximum tensile and compressive residual stress occurs at the fourth and fifth layers, respectively. Comparing the values of residual stresses at the fourth and fifth layers of 1 wt% CNF-reinforced CF/epoxy composite with CF/epoxy composite indicates that the residual stress in these layers decreases by about 38%.