a new analytical critical thrust force model for

2018-4-10different models presented The contribution of thrust force to delamination onset and propagation has been first demonstrated by Hocheng and Dharan [12] by their development of a model based on Fracture Mechanics to determine the critical thrust force for delamination This is the most referred analytical delamination model The results show that the analytical model overestimates the critical thrust force Another digital model proposed by Duro et al (2008) was developed with the computer code ABAQUS allowing prediction of the thrust force responsible for delamination at the hole exit during the drilling of a quasi-isotropic epoxy carbon composite

Experimental and Analytical Investigation of Drilling of

Figure 5 5: Orthotropic analytical model used when drilling [16] Experiment was also carried out by using tapered sharpened twist drill Comparative study was also done and resulted that the model is helpful to control critical thrust force on delamination and to optimize cutting condition and can be

In aerospace manufacturing drilling carbon reinforced composites is one of the dominant processes The exit-ply delamination directly related to the drilling thrust force occurs more often despite all precautions In this paper a new analytical model is presented to predict the critical thrust force at which delamination will start The model takes into account the thermo-mechanical loads

2019-9-8The thrust is the axial force applied by the wind on the rotor of a wind turbine Because all action yields an opposite reaction the thrust is therefore also the axial force applied by the wind turbine on the wind While the power output of a wind turbine describes only the amount of power

2014-4-17of jobs the analytical model could be used to estimate the memory performance of all possible job schedules and deter-mine the best one For a large number of jobs a brute-force search based on the model was intractable so a new heuristic method was developed It

By changing the size of the cell body we vary the necessary thrust force and thereby obtain a characteristic relation between the critical thrust force and motor torque We present a sophisticated analytical model for the buckling transition based on a helical rod which quantitatively reproduces the critical force-torque relation

Effective Simulation of Delamination in Aeronautical

2012-5-22A new analytical critical thrust force model for delamination analysis of laminated composites during drilling operation Composites Part B: Engineering Vol 124 Experimental and numerical studies on the stability behavior of composite panels stiffened by tilting hat-stringers

2017-5-231 A new analytical critical thrust force model for delamination analysis of laminated composites during drilling operation Saheed Olalekan Ojo a* Sikiru Oluwarotimi Ismail b Marco Paggia Hom Nath Dhakal b a IMT School for Advanced Studies Lucca Piazza San Francesco 19 55100 Lucca Italy b School of Engineering University of Portsmouth Portsmouth England PO1 3DJ United Kingdom

A model established predicts critical thrust force and critical feed rate at which the delamination crack begins to propagate in drilling of composite laminates Another model is constructed to predict cutting forces in the milling operation These models were verified by experiments

2018-9-17ination in drilling have been correlated to the thrust force during exit of the drill The first analytical model to de-termine the critical thrust force of the drill was formulated by Hocheng and Dharan [15] They employed linear elas-tic fracture mechanics (LEFM) method and solved for the critical thrust force that relates the delamination

The critical thrust force measured from the experimental investigation was compared with the results found by the newly developed analytical model Comparison of experimentally measured values and predicted values by the new model developed in this study with predicted values of thrust force values at the onset of delamination by other models

Jung et al [16] proposed a new formulation for the critical thrust force to propagate delamination in the case of angle-ply laminates In their model the authors have considered the exis-tence of twisting and mid-plane extension of the delamination zone Won and Dharan [17] [17]

The main purpose of the model is to compute the critical thrust force at the on-set of delamination during the drilling process Results of this analytical study indicated that the delamination damage can be alleviated if the applied thrust force is lower than the critical thrust force value

An analytical solution for lateral buckling critical load of leaning-type arch bridge was presented in this paper New tangential and radial buckling models of the transverse brace between the main and stable arch ribs are established Based on the Ritz method the analytical solution for lateral buckling critical load of the leaning-type arch bridge with different central angles of main arch

Modelling of Cutting Fibrous Composite Materials:

2018-12-12thrust force exceeds a critical value also called critical thrust force (CTF) and most of the modelling efforts were directed towards calculating this value The earliest CTF model was developed by Hocheng and Dharan 34[ ] then seminal contribution was made in the work of Hocheng and Tsao [30 3539-] Based on linear elastic

This paper proposes an orthotropic analytical model with the aim of calculating the drilling critical thrust force with a large diameter drill New assumptions are then proposed The plate element located under the cutter is broken down into a number of zones in relation to the cutter different active parts A digital model is developed to

Jung et al [16] proposed a new formulation for the critical thrust force to propagate delamination in the case of angle-ply laminates In their model the authors have considered the exis-tence of twisting and mid-plane extension of the delamination zone Won and Dharan [17] [17]

This model relates the drilling critical thrust force to the delamination conditions (opening of cracks) It takes into account the chisel edge effect and the principal cutting edge effect of the twist drill A close correlation between the experiment and the presented analytical model results is obtained

An analytical solution for lateral buckling critical load of leaning-type arch bridge was presented in this paper New tangential and radial buckling models of the transverse brace between the main and stable arch ribs are established Based on the Ritz method the analytical solution for lateral buckling critical load of the leaning-type arch bridge with different central angles of main arch