A finite element investigation into a soft rolling contact supplied by a non-Newtonian ink

Lim, C H; Bohan, M. F. J.; Claypole, Tim; Gethin, D. T.; Roylance, B. J.

doi:10.1088/0022-3727/29/7/025

Cited by 7 publications

(14 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Provided that the contact width is small in comparison with the roller diameter and the analysis plane is some distance from the roller edge then the Reynolds equation can be written in a one‐dimensional form asThe assumption of a Newtonian fluid is retained in this work and this is shared with many other publications (MacPhee et al , 1992; Bohan et al , 1997). Some printing inks are non‐Newtonian and this can affect the flow characteristics (Lim et al , 1996), however this will be described in a separate investigation. In this solution, the pressure at the inlet and outlet were set to zero together with the pressure gradient, satisfying a well‐established Swift‐Steiber condition.…”

Section: Reynolds Equationmentioning

confidence: 99%

See 1 more Smart Citation

The application of roughness model to a soft EHL contact

Bohan

Claypole

Gethin

2002

International Journal of Numerical Methods for Heat &Amp; Fluid Flow

View full text Add to dashboard Cite

The study focuses on the development of a numerical model to explore the impact of surface roughness in soft rolling nip contacts, including representation of a real surface. The solution of the governing equations required the application of a multigridding technique to capture the details of the fluid flow within the roughness wavelengths and a minimum number of fluid nodes per wavelength were established. In the case studies, two extreme roughness profiles were considered, longitudinal and circumferential. The longitudinal roughness had a significant impact on nip pressures and pumping capacity, the latter being determined by the minimum film thickness in the nip. The circumferential roughness was found to have a localised effect on film pressure, but only a very small impact on the film thickness profile. The consequent effect on pumping capacity was small.

show abstract

Section: Reynolds Equationmentioning

confidence: 99%

“…This has since been developed to evaluate different modes of lubrication dependent on the nip conditions (Hooke, 1986). These have then been further extended to different inlet and process conditions for Newtonian (MacPhee et al , 1992; Bohan et al , 1997) and non‐Newtonian fluids (Lim et al , 1996).…”

Section: Introductionmentioning

confidence: 99%

The application of roughness model to a soft EHL contact

Bohan

Claypole

Gethin

2002

International Journal of Numerical Methods for Heat &Amp; Fluid Flow

View full text Add to dashboard Cite

show abstract

“…The investigations reported in references [7] and [8] used the finite element method to investigate the junction between two printing rollers in offset printing. Solutions for deformation and pressure were obtained initially using a dry contact analysis.…”

Section: Previous Workmentioning

confidence: 99%

An investigation into plate deformation in flexographic printing

Bould

Claypole

Bohan

2004

Proceedings of the Institution of Mechanical Engineers, Part B:

Self Cite

View full text Add to dashboard Cite

Deformation of the flexographic printing plate is an important factor in determining the quality of the printed image. A numerical model of the individual dots has been developed and used to examine the deformation of the plate under a range of printing conditions and image characteristics. Two mechanisms have been identified for the deformation of the image on the plate: expansion of the dot surface and dot barrelling. These results have been combined with those from an experimental study to apportion the dot gain due to ink spreading and physical deformation of the dot. The results have shown the low-coverage dots at high line rulings to be particularly affected by the effect of variation in the impression pressure. This has significant implications for the ability of the process to reproduce high-resolution images that combine both highlight and shadow regions successfully and consistently. Ink spreading has been identified as the major cause of dot gain, except at low coverages, where the deformation of the dots makes a significant contribution.

show abstract

“…Bohan et al 17 explored the non-Newtonian fluid behaviour in soft elastohydrodynamic nip contacts, and found the viscosity coefficient, power law index and sliding ratio all affect the nip flow rate and film thickness in a non-linear manner. Lim et al 18 adopted a shear rate cut-off model to predict the positive film pressure zone to analyse the EHL behaviour of soft rolling contacts.…”

Section: Introductionmentioning

confidence: 99%

Plasto‐elastohydrodynamic lubrication performance of greased ellipsoid contact

Zheng

Gong

et al. 2021

Lubrication Science

View full text Add to dashboard Cite

The plasto-elastohydrodynamic lubrication (PEHL) model of the greased ellipsoid contact is established and solved numerically. In doing so, the increment theory of the plastic surface is adopted to solve the residual deformation, and the fast Fourier transform (FFT) method is employed to accelerate the deformation and stress calculations. Meanwhile, the effeteness of the PEHL model is verified through the residual stress experiment and finite element method. It is found that the plastic behaviour results in a reduction in the maximum grease film pressure. Under heavy load conditions, the grease with large rheology index, large tangential modulus or high entrainment speed of the lubricant is helpful to reducing the maximum residual deformation and maximum residual stress of the greased ellipsoid contact.

show abstract

A finite element investigation into a soft rolling contact supplied by a non-Newtonian ink

Cited by 7 publications

References 15 publications

The application of roughness model to a soft EHL contact

The application of roughness model to a soft EHL contact

An investigation into plate deformation in flexographic printing

Plasto‐elastohydrodynamic lubrication performance of greased ellipsoid contact

Contact Info

Product

Resources

About