scispace - formally typeset
Search or ask a question
Author

A. P. Anchev

Bio: A. P. Anchev is an academic researcher from Technical University of Gabrovo. The author has contributed to research in topics: Burnishing (metal) & Residual stress. The author has an hindex of 9, co-authored 29 publications receiving 265 citations.

Papers
More filters
Journal ArticleDOI
TL;DR: In this article, constitutive models of 2024-T3 aluminium alloy have been developed at room and high temperatures in order to be used in finite element simulations of cold hole working process.

49 citations

Journal ArticleDOI
TL;DR: In this paper, the effect of slide burnishing on the obtained roughness, micro-hardness, residual stress, fatigue strength (life) and wear resistance of chromium-nickel steels is investigated.
Abstract: Chromium–nickel steels are widely used in various fields of the engineering practice because of their increased corrosion resistance. One of the most used chromium–nickel steel is AISI 316Ti. It is known from the engineering practice that processing this steel by cutting creates difficulties and problems. However, there is no information regarding the effectiveness of the slide burnishing (SB) method in terms of quality of the processed surface of this chromium–nickel steel. A comprehensive experimental and FEM study of the surface integrity of slide burnished specimens made of AISI 316Ti austenitic stainless steel has been carried out. The effect of the SB parameters on the obtained roughness, microhardness, residual stress, fatigue strength (life) and wear resistance has been studied. A fully coupled thermal-stress FEM analysis has been conducted to be appreciated the effect of the generated temperature in SB process on the residual stress formation. The SB of AISI 316Ti steel achieves: roughness of Ra = 0.055 μm; micro-hardness increased by more than 32%; significant wear resistance; introduced residual stress with a maximum absolute value, which significantly exceeds the yield limit of the bulk material; increased fatigue strength by 38.9%; fatigue life increasing more than 385 times. The obtained experimental outcomes for the main characteristics of the surface integrity prove that SB can be successfully applied as a mixed burnishing for finishing symmetrical rotational components made of chromium–nickel steels.

40 citations

Journal ArticleDOI
TL;DR: In this paper, the effect of the process parameters on the surface roughness, micro-hardness, and residual stresses obtained in slide burnishing of D16T aircraft aluminum alloy has been analyzed.
Abstract: It is well known that apart from compressive residual stresses, smooth surface and microstructuring of the surface and subsurface layers are beneficial for enhancement of fatigue strength and load-carrying capacity of structural and machine components. This complex of properties can be achieved using surface severe plastic deformation. For symmetric rotational components made of high-strength aluminum alloys, slide burnishing is appropriate because of its simplicity and easy realization. The effect of the process parameters on the surface roughness, micro-hardness, and residual stresses obtained in slide burnishing of D16T aircraft aluminum alloy has been analyzed. The optimal values of the basic governing factors, which ensure minimum roughness (up to $$0.05\,\upmu\,{\text{m}}$$ ), have been established on the basis of a one-factor-at-the-time method, followed by a planned experiment and additional experiments. With the established combination of optimal values, the effect of number of passes and lubricant-cooler on the roughness, micro-hardness, and residual stresses in the surface being treated has been studied for two working schemes. To establish residual stress–depth profiles depending on the tool radius and burnishing force, FEM analysis of the slide burnishing process has been conducted. Thus, an evaluation of the effectiveness of slide burnishing as “mixed burnishing” has been made.

39 citations

Journal ArticleDOI
TL;DR: A review of slide burnishing of metal components is presented in this paper, where the main feature of SB is the sliding friction contact between the deforming element and the surface being treated.
Abstract: This review paper is devoted to the slide burnishing (SB) of metal components—state-of-the-art, achievements and perspectives. SB belongs to the group of static methods for mechanical surface treatment used largely in aerospace, automotive and other industries. By means of the plastic deformation of the surface layers, the surface integrity (SI) of the respective component is improved greatly in terms of minimum roughness, micro-hardness and introduced residual compressive stresses. As a result, fatigue crack resistance, crack corrosion resistance, wear resistance and corrosion resistance increase dramatically. The main feature of SB is the sliding friction contact between the deforming element and the surface being treated. Using the differential-morphological method, an integrated classification of the static methods is created and the area of SB is outlined. The proposed morphological matrix, which can be expanded and supplemented contains existing burnishing methods as well as combinations of elements and interactions that can be used to synthesize new burnishing methods and tools. In addition, a literature review of the publications devoted to SB has been conducted. Further, an analysis of the published studies on different criteria has been carried out and graphic visualizations of the statistical results have been made. On this basis, relevant conclusions have been made and the directions for future investigations of SB have been outlined.

36 citations


Cited by
More filters
Journal ArticleDOI
TL;DR: In this article, the effects of pre-treatments on aging precipitates and corrosion resistance of a creep-aged Al-Zn-Mg-Cu alloy were investigated by means of transmission electron microscope (TEM), scanning electron microscopy (SEM) and cyclic potentiodynamic polarization experiments.

102 citations

Journal ArticleDOI
TL;DR: A review on the hole cold expansion technology research status in the last twenty years is presented in this article, where the analysis of the current characteristics and defects of the holecold expansion technology, combined with the actual needs in design and manufacture of new-generation aircraft, development trends and novel research directions are presented for realizing precise and high-efficiency anti-fatigue manufacture.

76 citations

Journal ArticleDOI
TL;DR: In this paper, three finite element models have been established to study the residual stress fields of cold expansion hole, experiments were carried out to measure the residual strength of hole and verify simulation results.

66 citations

Journal ArticleDOI
TL;DR: In this article, the effect of tensile pre-strain before CAF on creep aging behavior of 2524 aluminum alloy is investigated by constant-stress creep aging test, Transmission Electron Microscope (TEM) and mechanical properties test.

53 citations

Journal ArticleDOI
TL;DR: In this article, the effect of shot peening surface roughness on the lifetime of fretting fatigue has been analyzed by means of a series of tests in which surface's fretting test specimens are polished.

52 citations