PARAMETRIC ANALYSIS OF COHESIVE MODELLING (CZM) FOR PURE MODE I DELAMINATION TEST ON A DOUBLE CANTILEVERED BEAM

• Main Author: Daffa Adhitama, Muhammad
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/74138
• Institution: Institut Teknologi Bandung

The use of mechanical joints that are prone to manufacturing defects and create stress concentrations sets a pursuit of alternative joining methods. Adhesive bonding is one of the centers of interest due to its potential to have a higher strength or toughness while keeping the structure lighter than most mechanically joined structures. One of the most relevant models for numerically modelling and analyzing the strength of adhesive joints is the Cohesive Zone Modelling (CZM) with the use of the bilinear traction-separation law. The parameters required for this model is acquired through experiments using standardized test specimens, such as double cantilevered beam (DCB) and end-notched flexure (ENF) for analyzing the strength of an adhesive material undergoing pure mode I loading, and single lap joint (SLJ) for analyzing the strength of an adhesive material undergoing mode II loading. This research evaluates the impact of variations of each CZM parameter, such as mesh sizing, failure criterion, fracture toughness, and damage evolution softening on the result of a numerical modelling of a double cantilevered beam specimen conducted on Abaqus. This research aims to construct a model that is able to accurately and consistently predict the response of a double cantilevered beam specimen and give an accurate output of mode I delamination fracture toughness (GIC). This research was able to construct a model that gives a convergent result, can consistently predict the bilinear traction-separation response of the specimen, and gives a measured GIC output with 0.02% error. However, the model wasn’t able to accurately predict the stiffness of the force vs. displacement response of the specimen.