Three-Dimensional Finite Element Modeling of Drilling-Induced Damage in S2/FM94 Glass-Fiber-Reinforced Polymers (GFRPs)

Abstract

Considering that the machining of composites particularly fiber-reinforced polymer composites (FRPCs) has remained a challenge associated with their heterogeneity and anisotropic nature, damage caused by drilling operations can be considerably mitigated by following optimum cutting parameters. In this work, we numerically evaluated the effects of cutting parameters, such as feed rate and spindle speed, on the thrust force and torque during the drilling of glass-fiber-reinforced polymers (GFRPs). A meso-scale, also known as unidirectional ply-level-based finite element modeling, was employed assuming an individual homogenized lamina with transversely isotropic material principal directions. To initiate the meso-scale damage in each lamina, 3D formulations of Hashin’s failure theory were used for fiber damage and Puck’s failure theory was implemented for matrix damage onset via user subroutine VUMAT in ABAQUS. The developed model accounted for the complex kinematics taking place at the drill–workpiece interface and accurately predicted the thrust force and torque profiles as compared with the experimental results. The thrust forces for various drilling parameters were predicted with a maximum of 10% error as compared with the experimental results. It was found that a combination of lower feed rates and higher spindle speeds reduced the thrust force, which in turn minimized the drilling-induced damage, thus providing useful guidelines for drilling operations with higher-quality products. Finally, the effect of coefficient of friction was also investigated. Accordingly, a higher coefficient of friction between the workpiece and drill-bit reduced the thrust force.

Rib Reinforcement Bionic Topology Optimization under Multi-Scale Cyclic Excitation

“…The formation of plant leaves and veins was generated under the impact of long-term wind and rain loads in nature, and it has excellent mechanical properties for impact, deformation, and energy absorption [43]. A mesoscale, also known as unidirectional ply-level-based finite-element modeling, was employed while assuming an individual homogenized lamina with transversely isotropic material principal directions in [44]. Following the above analysis, a bionic topology optimization method with multi-scale cyclic variable loading is proposed in this paper.…”

Tensile Behaviour of Double- and Triple-Adhesive Single Lap Joints Made with Spot Epoxy and Double-Sided Adhesive Tape

“…The universal joining technique is mechanical: removable in the form of bolts [ 5 ] and non-removable in the form of rivets [ 6 , 7 ]. Both of these techniques can be used to join composites to other materials, but mechanical joints usually require a hole, and stress concentrations occur, which is dangerous with the brittle linear characteristics of the PMC material [ 8 ]. An alternative is adhesive joints [ 9 , 10 , 11 ], which do not require interference with the structure of the parts to be joined.…”