Finite element analysis of contact deformation regimes of an elastic-power plastic hardening sinusoidal asperity

Liu, Ming; Proudhon, Henry

doi:10.1016/j.mechmat.2016.08.015

Cited by 27 publications

(11 citation statements)

References 74 publications

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“…Another recent paper on the topic is by Liu and Proudhon [129], which also includes the effect of strain hardening. Some of the results shown in this work appear to indicate that the average pressure does surpass the yield strength by up to a factor of 6, well past the conventional value of three.…”

Section: Two-dimensional Sinusoidal 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: Two-dimensional Sinusoidal 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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“…The choice of a highly spherical powder morphology allowed a consistent simplification in modelling. Nevertheless, Hertz's contact theory, giving an analytical solution to the sphere/plane contact, could not be applied due to consistent local plastic deformations that, according to [15], would appear in early deformation stages, well below the sensitivity of the experimental system. Instead, a FEM 2D axisymmetric model was developed on Abaqus/Standard® commercial software.…”

Section: Single Particle Micro-compressionmentioning

confidence: 99%

Characterization of mechanical behaviour of aluminum powders under fast dynamic conditions

et al. 2021

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Cold spray is a process belonging to the thermal spray family, characterized by relatively low temperatures and high particle velocities. Upon impact, particles undergo large plastic deformation at solid state in dynamic regime up to 109 s-1. The knowledge of powder behaviour in such conditions is essential to catch key phenomena in cold spray and a necessary step for a correct process modelling. However, little is known on mechanical behaviour of feed-stock powders when submitted to cold spray conditions. In this study, an approach focused on single particles combining laser shock induced impact, namely LASHPOL (LAser SHock POwder Launcher), and quasi-static compression was therefore developed. This method was applied in this study on spherical Aluminium powders but can work with any other powder material. The mechanical behaviour of powders was characterized and used to fit the parameters of Johnson-Cook constitutive model, by means of finite element inverse method. The combination of static and dynamic tests resulted in an original characterization of powder, which revealed having a different mechanical behaviour than the corresponding bulk material.

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“…It is to finiteelement models that they are increasingly turning to validate analytical stochastic models, for example, [17][18][19][20]. Finite element modeling of rough surfaces contact is considered to be superior for elastic-plastic material behavior [21] and, moreover, is expected to deliver reference results for other contact mechanics approaches [17]. The essential advantage over other methods is also that it allows to consider influence of the form of asperities and change of material properties in the deformation process.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, a lot of work is devoted to single asperity models. More often, three approaches were used: the flattening of the deformed sphere between two absolutely hard surfaces [30][31][32], the flattening of the sinusoidal asperity by a rigid flat [21,28,29], and the indentation of a rigid hemisphere into the deformable space. Ghaednia et al [33], using the finite element method, solved a thermo-electro mechanical axisymmetric problem for elastic perfectly-plastic deformation of a hemisphere and a substrate.…”

Section: Introductionmentioning

confidence: 99%

A Condition for Complete Flattening of Asperities in a Rough Contact

Murashov

2018

MATEC Web Conf.

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Considering rough surface profiles in a contact model is of decisive importance. In the up-to-date rough contact models there remained underexplored the opportunity of complete flattening of smaller asperities and therefore the need of using the multilevel roughness models, including fractal ones. If higher level asperities are not flattened completely when pressed, then they will be able to impact on the contact process. This paper considers model problems of elastic-plastic contact with hardening for a body with protrusions and two pyramids as the objects similar to asperities. Modeling results show that asperities are completely flattened only on condition of confined compression. For real contacting rough surfaces under low pressures, complete flattening of asperities will not occur. It is shown that roughness elements on the surface of the asperities do not disappear even at severe deformation of the latter. The reason is a combination of the asperity form and hardening of material, while the consequence is a reduction of the real contact area.

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Finite element analysis of contact deformation regimes of an elastic-power plastic hardening sinusoidal asperity

Cited by 27 publications

References 74 publications

A Review of Elastic–Plastic Contact Mechanics

A Review of Elastic–Plastic Contact Mechanics

Characterization of mechanical behaviour of aluminum powders under fast dynamic conditions

A Condition for Complete Flattening of Asperities in a Rough Contact

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