Evaluation of energy release rate of composites laminated with finite element method

Effect of the Fibers Orientation of the Different Types of Composite Plates Notched of U-Shape Repaired by Composite Patch

“…Achache et al 14 also made a study aimed at the numerical analysis of the energy release rate factor G of a composite laminated board (glass or boron/epoxy) cross layer [+a, −a] in the presence of a crack between two circular slits under the influence of several parameters such as fiber orientation a and orientation crack 14 . Some studies have shown that the difference in fiber orientation and stacking sequence affects the performance and selection of the composite material and that by adding additional layers, it can strengthen the patch until its performance is optimal 15,16 .…”

Experimental and Numerical Study on the Efficiency of the Repair of Composite Structures Cracked and V-Notched By Different Types and Shapes of Composite Material Patch

“…Several studies have also discussed the effect of fiber orientations on the performance of the composite material in terms of repair efficiency [22][23][24][25][26][27][28][29][30][31], These and many other studies have also shown that fibers oriented in the same direction of tensile stress (longitudinal direction) are more efficient and more resistant to fibers oriented vertically (transverse direction) with tensile strength, the risk of damage is greater compared to the first direction. There are also some works focused on the natural materials used in composite materials [32][33] Our work is based on two phases in which studied composite structure of boron / epoxy type laminated notched V shape and damaged by emanating crack and repaired by single composite (patch) of different types (Boron / epoxy and Graphite / epoxy), and different shapes (full, normal, V-shape).…”