Numerical prediction of delamination in CFRP drilling

Abstract

CFRPs Drilling Delamination ModelingDelamination is one of the undesired effects of machining using non appropriate cutting parameters or worn drill. Finite element modeling of drilling of Carbon Fiber Reinforced Polymer (CFRP) composites is an interesting tool for damage prediction. Recently, complete modeling of the process including the rotatory movement of the drill, penetration in the composite plate and element erosion has been developed in the scientific literature. Computational cost of these complex models is a great disadvantage when comparing them with simplified models that consider the drill acting like a punch that pierces the laminate. In this paper both complete and simplified models were developed and compared in terms of delamination prediction. The simplified model, presenting reduced computational cost, slightly overestimates the delamination factor when compared with the complex model. The influence on delamination of thrust force, clamping area at the bottom surface of the laminate and the stacking sequence is studied using the simplified model.

Drilling optimization of woven CFRP laminates under different tool wear conditions: a multi-objective design of experiments approach

“…As well, further development and validation of advanced nu-merical models of composites drilling, e.g., (Faraz et al 2009;Soldani et al 2011;Feito et al 2014a), may be conducted using experimental data, along with an in-depth understanding of the macro/meso level mechanisms that correlate to cutting parameters and lead to damage during the process. Eventually using such models, new/customized drilling tools may be de-veloped for composites.…”

“…When compared to the above experimental works, numerical models on predicting delamination during composite drilling have been developed more recently (Soldani et al 2011;Feito et al 2014a;Phadnis et al 2013). Some of these finiteelement based models are aimed not only at estimating delamination, but also the torque and feed force, and their correlations with the underlying mechanical properties of the forming material at different (macro/meso/micro) scales.…”

A review on recent advances in numerical modelling of bone cutting

“…The complexity of finite element models has motivated the development of analytical and mechanistic models based on extensive experimentation. Even in the case of metal and composite drilling, it is difficult to find accurate numerical models due to the above difficulties and the high computational cost involved in simulation of the drilling process (Feito et al, 2014). Lee et al (2012) developed a mechanistic force model for prediction of thrust force and torque during bone drilling.…”

“…Even in the wellknown field of metal, it is hard to find complete models of drilling including chip removal simulation. In the case of composite drilling, the development of anisotropic models for composites in complex cutting processes such as drilling has been recently reported in the literature (Feito et al, 2014). The advantage of this type of models is the possibility of predicting cutting forces, temperature and mechanical damage.…”

The influence of anisotropy in numerical modeling of orthogonal cutting of cortical bone

“…In this work the bone was considered to be anisotropic and only elastic proper-ties are presented in the paper. Even in the case of carbon fibre composites, there are few works dealing with a complete approach to drilling and they have been recently developed [17,18].…”