A user-friendly finite element model for radial mode abrasive waterjet turning

Abdelhameed, Y.; Hassan, Ashraf I.; Kaytbay, Saleh

doi:10.1177/09544054211017305

“…An explicit dynamic analysis predicts the crater pro le resulting from the impact of the abrasive particles along a limited segment of the jet pass over the work piece surface. It shows the effect of both momentum transfer loss and abrasive load ratio while calculating the impact velocity of the abrasive particles [30]. A cutting edge preparation with the aid of robot-assisted compressed air wet-jet cutting used a geometric and kinematic simulation model.…”

Section: Automated Scarfing and Model Approachesmentioning

confidence: 99%

A Model Based Material Removal Simulation for Vacuum Suction Blasting of Composites

Brieskorn,

Hintze,

Rajanna

2023

Preprint

1

0

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Automated scarfing of carbon reinforced plastic (CFRP) layers is on its way to support commercial aircraft repair. In the industry, still, the manual scarfing operation is the qualified method. However, automated techniques as milling, laser removal and water jet cutting are in development and showed already good results. Another promising method is vacuum suction blasting (VSB) that was until now in particular used for the roughening of surfaces before adhesive bonding. To find the right adjustment for the parameters many experiments would be necessary accordingly to different CFRP parts with changing layer thicknesses. Simulation is a way to avoid this and to predict the removal result and the settings for the machining parameters. The VSB model uses a pixel method dividing the simulated part surface into smaller volume elements. Experimental data of VSB static blasting spots are the basic for the source matrix. The simulation feeds the matrix with the blasted depth and removal volume for different blasting times. A shifting of columns of the source matrix in the blasting movement direction simulates the movement of the blasting nozzle on the work piece surface. With this, the model can also predict the nozzle feed to remove exactly one complete layer for each scarfing step. In addition, it visualizes the seamless overlapping distance between two blasted tracks. With further adjustments, the model will predict the dynamic removal for varying input parameters such as negative pressure and nozzle distance or blasting agent. CLASSIFICATIO CODES MSC: 26B15, 65L12, 97G30, 15A24 JEL: C20

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“…In order to avoid the interference of initial damage to the installation experiment of temporary fasteners, the test pieces are all cut by water jet. 21 The CVD diamond-coated brad spur drill 22,23 is used to drill from the rough side to the other side, and the exit side is padded with wood. The side length of composite specimens is 60 mm 3 40 mm, and the hole diameter is 6.38 mm.…”

Section: Cfrp Specimensmentioning

confidence: 99%

Experimental study on temporary fastening damage of composite structures

Chen¹,

Lin²,

Wang

³

2022

Proceedings of the Institution of Mechanical Engineers, Part B:

3

0

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An experimental investigation was conducted to determine the form and characteristics of damage that temporary fasteners may cause to the composite hole in the aviation temporary fastening process. According to the shapes of the temporary fastener clamping feet, copying indenters were designed. The similarity between the quasi-static indentation (QSI) experiment and the installation of temporary fasteners was discussed. The QSI experiment was used to investigate the influence of shapes of clamping feet, prepreg category, installation direction, and other factors on the failure of the composite hole, and the displacement-load curves were obtained. The damage morphology was observed with the optical microscope and ultrasonic microscope. The results show that the QSI experiment can simulate the temporary fastening damage well. Due to the expansion of delamination, and the final occurrence of fiber breakage in the composite hole, the bearing capacity is reduced. The temporary fastening damage process can be divided into three stages: in the elastic stage, the laminate does not suffer damage, and the surface resin appears slight dents; in the delamination stage, the layers delaminate at the edge of the contact surface, and expand in the direction of fiber; in the failure stage, sudden damage occurs suddenly under the indenter, and the fiber matrix is crushed into powder. The propagation range of the damage depends on the material properties and installation direction. Compared with T700/3234, T800/X850 has greater energy absorption before the damage. Laminates have the worst anti-intrusion ability out-of-plane in the surface fiber direction. These results increase the understanding of the out-of-plane compression damage of the composite material and provide a theoretical basis and method guidance for the control of the temporary fastening damage of the composite structures. The copying indenter designed in this paper can be used for further research on temporary fastening damage.

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A model based material removal simulation for vacuum suction blasting of composites

Brieskorn,

Hintze,

Doddagopenahallli Rajanna

2024

Discov Appl Sci

1

0

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Automated scarfing of carbon reinforced plastic (CFRP) layers is on its way to support commercial aircraft repair. In the industry, still, the manual scarfing operation is the qualified method. However, automated techniques as milling, laser removal and water jet cutting are in development and showed already good results. Another promising method is vacuum suction blasting (VSB) that was until now in particular used for the roughening of surfaces before adhesive bonding. To find the right adjustment for the parameters many experiments would be necessary accordingly to different CFRP parts with changing layer thicknesses. Simulation is a way to avoid this and to predict the removal result and the settings for the machining parameters. The VSB model uses a pixel method dividing the simulated part surface into smaller volume elements. Experimental data of VSB static blasting spots are the basic for the source matrix. The simulation feeds the matrix with the blasted depth and removal volume for different blasting times. A shifting of columns of the source matrix in the blasting movement direction simulates the movement of the blasting nozzle on the work piece surface. With this, the model can also predict the nozzle feed to remove exactly one complete layer for each scarfing step. In addition, it visualizes the seamless overlapping distance between two blasted tracks. With further adjustments, the model will predict the dynamic removal for varying input parameters such as negative pressure and nozzle distance or blasting agent.

show abstract

A user-friendly finite element model for radial mode abrasive waterjet turning

Cited by 4 publications

References 31 publications

A Model Based Material Removal Simulation for Vacuum Suction Blasting of Composites

A Model Based Material Removal Simulation for Vacuum Suction Blasting of Composites

Experimental study on temporary fastening damage of composite structures

A model based material removal simulation for vacuum suction blasting of composites

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