Ultrasonically assisted drilling: A finite-element model incorporating acoustic softening effects

International Symposium on Dynamic Deformation and Fracture of Advanced Materials 2013

物理学;材料科学

Phadnis, V.A.^1 ; Roy, A.^1 ; Silberschmidt, V.V.^1

Wolfson School of Mechanical and Manufacturing Engineering, Loughborough University, LE11 3TU Loughborough, United Kingdom^1

关键词: 3D finite element model;    Carbon fibre reinforced polymer;    Conventional drilling;    Machining characteristics;    Phenomenological modeling;    Quasibrittle material;    Thrust force and torque;    Ultrasonically assisted drillings;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/451/1/012040/pdf
DOI  :  10.1088/1742-6596/451/1/012040

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Ultrasonically assisted drilling (UAD) is a novel machining technique suitable for drilling in hard-to-machine quasi-brittle materials such as carbon fibre reinforced polymer composites (CFRP). UAD has been shown to possess several advantages compared to conventional drilling (CD), including reduced thrust forces, diminished burr formation at drill exit and an overall improvement in roundness and surface finish of the drilled hole. Recently, our in-house experiments of UAD in CFRP composites demonstrated remarkable reductions in thrust-force and torque measurements (average force reductions in excess of 80%) when compared to CD with the same machining parameters. In this study, a 3D finite-element model of drilling in CFRP is developed. In order to model acoustic (ultrasonic) softening effects, a phenomenological model, which accounts for ultrasonically induced plastic strain, was implemented in ABAQUS/Explicit. The model also accounts for dynamic frictional effects, which also contribute to the overall improved machining characteristics in UAD. The model is validated with experimental findings, where an excellent correlation between the reduced thrust force and torque magnitude was achieved.