A comparison of methods to evaluate the behavior of finite element models with rough surfaces

Thompson, Mary Kathryn

doi:10.1002/sca.20252

Cited by 13 publications

(8 citation statements)

References 36 publications

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“…Sahoo and Ghosh [226] examined the deterministic contact of elastic-plastic fractal surfaces and made some comparisons to experimental measurements with mixed results. Thompson and Thompson [227,228] discussed the methodologies used to construct and implement rough surface contact finite element models with the aim of predicting thermal contact resistance. Specifically, they showed how to effectively incorporate real rough surfaces into a finite element mesh.…”

Section: Rough Surface Contactmentioning

confidence: 99%

A Review of Elastic–Plastic Contact Mechanics

Ghaednia

Wang

Saha

et al. 2017

Applied Mechanics Reviews

222

120

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In typical metallic contacts, stresses are very high and result in yielding of the material. Therefore, the study of contacts which include simultaneous elastic and plastic deformation is of critical importance. This work reviews the current state-of-the-art in the modeling of single asperity elastic–plastic contact and, in some instances, makes comparisons to original findings of the authors. Several different geometries are considered, including cylindrical, spherical, sinusoidal or wavy, and axisymmetric sinusoidal. As evidenced by the reviewed literature, it is clear that the average pressure during heavily loaded elastic–plastic contact is not governed by the conventional hardness to yield strength ratio of approximately three, but rather varies according to the boundary conditions and deformed geometry. For spherical contact, the differences between flattening and indentation contacts are also reviewed. In addition, this paper summarizes work on tangentially loaded contacts up to the initiation of sliding. As discussed briefly, the single asperity contact models can be incorporated into existing rough surface contact model frameworks. Depending on the size of a contact, the material properties can also effectively change, and this topic is introduced as well. In the concluding discussion, an argument is made for the value of studying hardening and other failure mechanisms, such as fracture as well as the influence of adhesion on elastic–plastic contact.

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Section: Rough Surface Contactmentioning

confidence: 99%

A Review of Elastic–Plastic Contact Mechanics

Ghaednia

Wang

Saha

et al. 2017

Applied Mechanics Reviews

222

120

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“…Instead of analytical techniques to describe the deformation of two rough surfaces, FEA programs such as ANSYS could be utilised to describe elastic perfectly plastic deformation of the interface as shown by Megalingam and Mayuram (2012) using actual 3D or 2D scanned surfaces. There is other literature particularly by Thompson (Thompson, 2007b;Thompson and Thompson, 2010b,a;Thompson, 2007aThompson, , 2011, which gives further guidance on multi-scale modelling and optical measurements of the surface aperture which is then transferred into ANSYS. The FEA would require some form of verification of the surface deformation accuracy, but if achieved, this will allow a more accurate representation of the fluid flow path.…”

Section: Summary and Discussionmentioning

confidence: 99%

Application of Multi-scale Approaches to the Investigation of Sealing Surface Deformation for the Improvement of Leak Tightness in Pressure Relief Valves

Anwar

Gorash

Dempster

2016

Advanced Structured Materials

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This chapter is part of a research program to investigate and model the leak tightness of a Pressure Relief Valve (PRV). Presented here is: a literature review; high temperature numerical study involving the deformation of contact faces for a metal-to-metal seal accounting for micro and macro effects; and also microscopic measurements of surface finishes and how they are modelled over a micro to nanometer scale. Currently, no review of literature exists which attempts to understand the leakage phenomenon of metal-to-metal seal contact PRV for static closed positions as they reach the set pressure point. This work attempts to do just that by drawing on inspiration from other research areas such as metal-to-metal contact and gasket seals. The key topics of interest surrounding the leakage of fluid through a gap are: fluid flow assumptions, surface characteristics and its deformation, and experimental techniques used to quantify leakage. For the numerical study, the valve geometry is simplified to an axisymmetric problem, which comprises a simple geometry consisting of only three components: a cylindrical nozzle, which is in contact with a disc (representing the valve seat on top), which is preloaded by a compressed linear spring. The nozzle-disk pair is made of the austenitic stainless steel AISI type 316N(L) steel. In a previous study, the macro-micro interaction of Fluid Pressure Penetration (FPP) was carried out in an iterative manual procedure at a temperature of 20 • C. This procedure is now automated and implemented through an APDL script, which adjusts the spring force at a macro-scale to maintain a consistent seal at elevated temperatures. Finally, using the Alicona Infinite Focus the surface form and waviness is measured, presented and modelled as 1/4 symmetric over a macro to nanometer scale. It is clear the surface form also needs to be accounted for, something which the literature does not focus on.

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“…При разбиении следует учитывать еще и то, что заметное влияние на величину вычисленной площади фактического контакта может оказывать равномерность объемной плотности сетки вблизи контактирующих элементов шероховатости (в области пластической деформации). В [21] выполнены расчеты на конечноэлементных моделях с различной объемной плотностью сетки и одинаковым числом поверхностных элементов. Погрешность определения площади фактического контакта при наименьшей объемной плотности элементов составила 42,64 %.…”

Section: рис 6 область контакта после деформирования при однократноunclassified

Features of a Finite Element Solution to Calculating Real Contact Area of Rough Bodies

Murashov¹,

Panin²

2016

HoBMSTU.SIE

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АннотацияКлючевые слова Решение задач контакта в точном приборостроении и прецизионном машиностроении позволяет прогнозировать тепло-и электропроводность контактов, трение и износ деталей приборов. Определяющим параметром в контактной задаче является площадь фактического контакта. Рассмотрен способ определения площади фактического контакта при взаимодействии двух шероховатых тел под действием внешнего давления. На примере тел микронных размеров изучено влияние на результат плотности сеточного разбиения. Даны рекомендации по выбору плотности сеток для снижения погрешностей расчета. Проведено сравнение результатов расчетов для моделей с шероховатостью первого и второго уровней. Показано, что при отсутствии учета размерного эффекта внедрения при переходе на модель с шероховатостью второго уровня площадь фактического контакта меняется несущественно Фактическая площадь контакта, шероховатость, метод конечных элементов, упругопластическая деформация, ANSYS Поступила в редакцию 28.07.2015

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A comparison of methods to evaluate the behavior of finite element models with rough surfaces

Cited by 13 publications

References 36 publications

A Review of Elastic–Plastic Contact Mechanics

A Review of Elastic–Plastic Contact Mechanics

Application of Multi-scale Approaches to the Investigation of Sealing Surface Deformation for the Improvement of Leak Tightness in Pressure Relief Valves

Features of a Finite Element Solution to Calculating Real Contact Area of Rough Bodies

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