PEMODELAN PERAMBATAN RETAK MODUS I PADA SAMBUNGAN REKAT KOMPOSIT DENGAN SISIPAN ELASTOPLASTIK

• Main Author: Sandovic Perdana, Arifian
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/62019
• Institution: Institut Teknologi Bandung

The use of composites in aerospace continues to increase. However, the joining method of composite can cause damage on the material. Bolting/riveting can be used on this material, but the bolt/rivet will break the matrix and fibers. It will cause strength reduction as the load bearing mechanism between the matrix and the fibers disturbed. Hence, adhesive joint is a great method for joining composites. Unfortunately, adhesive joints are quite vulnerable to brittle delamination (quick crack propagation) which is indicated by the low value of fracture toughness. Therefore, the methods for increasing the fracture toughness of adhesive joint is still being developed. Some concepts that can be applied to increase the fracture toughness are hybrid bondline and bridging. This research focused on hybrid bondline and bridging concept by finding the strategy for modelling an adhesive joint filled with elastoplastic inserts using finite element analysis. The model used in the simulation is double cantilever beam specimen which defined with CFRP (Carbon Fiber Reinforced Polymer) for the substrate, Araldite 420 A/B for the adhesive, and 3D-printed polyamide-6 for the elastoplastic inserts. The result will be presented in the form of load vs. displacement curve and R-curve (mode I fracture toughness vs. crack length). The 2D model built can generally capture the phenomenon of crack propagation in composite bonded joints. According to the reference experiment, the 2D model also shows that elastoplastic inserts can increase the mode I fracture toughness of the composite bonded joint.