Compression Mechanics of Cylindrical Samples with Radial Deformation Limitation

Shepelenko, Ihor; Tsekhanov, Yuri; Nemyrovskyi, Yakiv; Gutsul, Vasiliy; Mahopets, Sergii

doi:10.1007/978-3-030-77823-1_6

Cited by 6 publications

(3 citation statements)

References 7 publications

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“…The authors proved that the aluminum content affects the mechanical characteristics of this cast iron type. Shepelenko et al identified the plastic deformation of low-ductility cast iron at significant negative values of the stress triaxiality ratio [37]. The stress triaxiality ratio is widely used to evaluate their stress-strain state [38][39][40].…”

Section: Methods For the Determination Of Plasticity Marginmentioning

confidence: 99%

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Plasticity Resource of Cast Iron at Deforming Broaching

Nemyrovskyi

Shepelenko

Storchak

2023

Metals

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The contact interaction mechanics of deformation broaching in low-plasticity materials is studied. Particular attention is paid to the study of the stress–strain state parameters and the plasticity margin in the deformation zone during the machining of gray cast iron EN-GJL-200. The stress–strain state was analyzed using a finite-element model of the deforming broaching process for each area of the deformation zone. The model parameters of the machined material were determined experimentally by compressing specimens of gray cast iron EN-GJL-200. The changes in the parameters of accumulated strain, stress tensor components, stress triaxiality ratio, hydrostatic stress, and plasticity margin at different deformation zones along the machined specimen depth are analyzed. It is shown that there is a zone of local plastic deformation in conditions of critical contact stresses. This leads to the appearance of tensile stresses that reduce the plasticity margin in the surface layer. The impact of tool geometry on the stress–strain state of the surface layer is also discussed, and recommendations for the optimal working angle of the deforming element are provided based on plasticity margin minimization.

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Section: Methods For the Determination Of Plasticity Marginmentioning

confidence: 99%

“…This provides significant plastic deformation in the surface layer of the machined workpiece. For example, after 35-40 machining cycles of plastic materials (35)(36)(37)(38)(39)(40) drawing cycles using the deforming elements with tightening), the deformation in the workpiece subsurface layers can reach a value of 350-400% [1].…”

Section: Introductionmentioning

confidence: 99%

Plasticity Resource of Cast Iron at Deforming Broaching

Nemyrovskyi

Shepelenko

Storchak

2023

Metals

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“…В роботі [10] авторами встановлені умови пластичного деформування чавуну СЧ20 та побудована діаграма пластичності для цього матеріалу. На підставі виконаних досліджень автори [10,11] прийшли до висновку щодо можливості та доцільності використання ДПР при обробці деталей із малопластичних матеріалів.…”

Section: вступunclassified

Improving the quality of antifriction coatings using plastic deformation

Shepelenko¹,

Nemyrovskyi²,

Posviatenko³

2022

Mech. Adv. Technol.

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One of the ways to solve the shortage of anti-friction materials based on copper is the creation of anti-friction coatings on the surface of parts made from domestic raw materials. The technology of applying anti-friction coatings by finishing anti-friction non-abrasive treatment on the working surfaces of cast-iron products is considered. The use of deforming broaching to improve the quality of the antifriction coating is proposed. The reserves for their improvement due to the creation of favorable shapes and sizes of microroughnesses in the operations preceding the coating are determined. The study of the contact interaction of the microroughness of the machined surface with the tool was carried out on model samples. The main regularities of the formation of an antifriction coating on a cast-iron surface are established depending on the initial microrelief and processing modes. The effectiveness of the use of deforming broaching when applying an antifriction coating is studied by changing the height parameter of roughness. The performed studies allowed us to propose various schemes of the technological process of applying anti-friction coatings by the friction-mechanical method using deforming broaching, depending on the technical requirements for the product.

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