Experimental and theoretical analysis of the elasto-plastic oblique impact of a rod with a flat

Gheadnia, Hamid; Cermik, Ozdes; Marghitu, Dan B.

doi:10.1016/j.ijimpeng.2015.08.007

Cited by 37 publications

(29 citation statements)

References 25 publications

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“…Many analytical, experimental, and numerical studies have been performed to simulate and predict various contact properties, such as the real radius of contact, stress distribution, and contact force. Spherical contact models are used by many researchers from different fields such as tribology, mechanical impact [31][32][33][34][35], and electrical contact [11,31,32,[36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54]. Even though the spherical geometry is often used to consider asperity contact, it can also be used to consider the flattening of particles between surfaces, such as in anisotropic conductive films [51] or in the presence of wear particles [55] and nanoparticles [50].…”

Section: Normal Spherical Contactmentioning

confidence: 99%

A Review of Elastic–Plastic Contact Mechanics

Ghaednia

Wang

Saha

et al. 2017

Applied Mechanics Reviews

220

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: Normal Spherical Contactmentioning

confidence: 99%

A Review of Elastic–Plastic Contact Mechanics

Ghaednia

Wang

Saha

et al. 2017

Applied Mechanics Reviews

220

120

View full text Add to dashboard Cite

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“…Contact mechanics is one of the most common problems in mechanical engineering and tribology, with a variety of applications in collision mechanics [1][2][3], joint structures [4,5], electrical contact [6], thermal contact [7], solid mechanics [8][9][10][11], seals and bearings [12], biomechanical systems [13,14], turbines [15], and additive manufacturing [16,17]. The studies in contact mechanics can be categorized into: single asperity spherical, elliptical, cylindrical and flat contacts, with single asperity spherical contact being the most employed one [18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

“…Subsequent models, such as Kogut and Etsion's [33], Zhao 115 et al [34], Thornton and coworkers [35], Wu et al [36] Jackson 116 and Green [27], Shankar and Mayuram [36,37], and Lin and Lin 117 [38] were developed to predict the contact parameters of an 118 elastic-perfectly plastic flattening contact. Several of these mod-119 els have been compared with each other and to experimental 120 results of normal and oblique collision tests in Ghaednia et al [3] 121 and Brake [39,40]. Both Brake's and Ghaednia's studies show 122 very good matches between experiments and quasi-static numeri-123 cal simulations using the aforementioned contact models in terms 124 of the coefficient of restitution; however, recently, Ghaednia and 125 Marghitu [1] showed that in the case of permanent deformations 126 after collision, numerical simulation predictions are an order of 127 magnitude off compared to the experimental results.…”

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confidence: 99%

Strain Hardening From Elastic–Perfectly Plastic to Perfectly Elastic Flattening Single Asperity Contact

Ghaednia

Brake

Berryhill

et al. 2018

Journal of Tribology

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For elastic contact, an exact analytical solution for the stresses and strains within two contacting bodies has been known since the 1880s. Despite this, there is no similar solution for elastic–plastic contact due to the integral nature of plastic deformations, and the few models that do exist develop approximate solutions for the elastic–perfectly plastic material model. In this work, the full transition from elastic–perfectly plastic to elastic materials in contact is studied using a bilinear material model in a finite element environment for a frictionless dry flattening contact. Even though the contact is considered flattening, elastic deformations are allowed to happen on the flat. The real contact radius is found to converge to the elastic contact limit at a tangent modulus of elasticity around 20%. For the contact force, the results show a different trend in which there is a continual variation in forces across the entire range of material models studied. A new formulation has been developed based on the finite element results to predict the deformations, real contact area, and contact force. A second approach has been introduced to calculate the contact force based on the approximation of the Hertzian solution for the elastic deformations on the flat. The proposed formulation is verified for five different materials sets.

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“…The introduction of such algorithm is equivalent to the procedure of changing boundary conditions on the contact surface with a perfect slip condition at the rigid couplings [20][21]. Note that the use of such algorithm is possible only under the condition that all segments are made of the same material [22][23][24][25].…”

Section: Problem Statement and Initial Datamentioning

confidence: 99%

High-Speed Interaction Rod and Segmented Projectiles into Massive Obstacles

2016

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Abstract. In this paper we consider issues related to numerical modelling of processes of high-speed impact effect of a consistent series of damaging elements on the massive barrier. Research is carried out by comparing the finite speed of penetration of this series at a speed of penetration of the elongated one-piece (rod) of the missile of the same mass and diameter. Examines the range of initial impact speeds from 1 to 12 km/s taking into account such physical phenomena as fracture, melting and evaporation of the interacting bodies. The analysis showed that almost in all range of impact speeds segmented drummer is better solid elongated.

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Experimental and theoretical analysis of the elasto-plastic oblique impact of a rod with a flat

Cited by 37 publications

References 25 publications

A Review of Elastic–Plastic Contact Mechanics

A Review of Elastic–Plastic Contact Mechanics

Strain Hardening From Elastic–Perfectly Plastic to Perfectly Elastic Flattening Single Asperity Contact

High-Speed Interaction Rod and Segmented Projectiles into Massive Obstacles

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