Non-destructive test of steel structures by conical indentation

Beskopylny, Alexey; Veremeenko, Andrey; Kadomtseva, Elena; Beskopylnaia, Natalia

doi:10.1051/matecconf/201712902046

Cited by 23 publications

(15 citation statements)

References 11 publications

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“…The model of the Winkler base gives the results closest to the experimental ones, which is proved by the experiments carried out with rigid stamps [1,2], dynamic indentation [3], experiments with finite stiffness beams [4,5]. In this paper, we consider an arbitrarily loaded, arbitrarily supported reinforced concrete beam made of bimodule material on an elastic Winkler base.…”

Section: Introductionmentioning

confidence: 71%

Static analysis of a reinforced bimodulus beam on elastic foundation

2018

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The work considers a reinforced concrete beam made of bimodule material on an elastic Winkler base. The influence of the number of reinforcing bars located in the stretched zone on the maximum normal stress and the maximum deflection is numerically investigated. The choice of the cross-section dimensions, such as the width and thickness of the flanges, the height of the beam, causes particular difficulties and is limited by the need to determine specific ratios of I-beam sizes. Numerical investigation allows analyzing the influence of the width of the I-beam flange that is in contact with the elastic base on the maximum tensile stresses and maximum deflection. The effect on the stressed-deformed state of the various cross-section forms is carried out in work for an I-beam, a rectangle, and a T-beam. Related to the fact that for many building materials the elastic moduli for tension and compression differ, it became necessary to determine the influence of material heterogeneity on the stress-strain state of the elements of building structures. In particular, the widespread use of reinforced concrete beams as elements of band foundations requires a refinement of the stress-strain state study taking into account the heterogeneity of concrete.

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Section: Introductionmentioning

confidence: 71%

Static analysis of a reinforced bimodulus beam on elastic foundation

2018

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“…When designing Novikov's adjusted gears, the bias coefficients should be assigned from the condition that the contact propagation to the pole zone be excluded [22]. It can be measured with nondestructive tests [23,24].…”

Section: Discussionmentioning

confidence: 99%

The Contact Mechanics of Novikov’s Surface-Hardened Gearing during Running-in Process

Beskopylny

Onishkov

Korotkin

2018

Advances in Tribology

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The article is devoted to the analysis of the state of the contact surfaces of the higher kinematic pair in the general case of relative motion, that is, in the presence of rolling, sliding, and twisting, which is characteristic of Novikov’s circular-screw gears. The purpose of the work is to assess the impact of friction forces, the state of contact surfaces after tool processing, and the localization of the instantaneous contact spot on the level of contact—fatigue durability of gears. Power contact in the presence of geometric slippage of the mating surfaces leads to a significant change in the initial geometry and the mechanical properties of surface layers. In the existing methods of calculations of contact strength, the effect of running-in is investigated insufficiently, which leads to an incorrect result, especially for gear with high hardness of the teeth. In this work, the conditions of contact interaction close to the real requirements are studied on the basis of experimental material, numerical solution of the contact problem, determination of the terms of the contact areas of slip, and adhesion within the instantaneous spot. The shape of the instant contact spot has asymmetry and can be approximated by an ellipse with the introduction of a correction factor. The running-in period is of a plastic nature with cold deformation and reduction of the roughness of surfaces. As a result of the run-in period, the area of actual contact (tooth height) is increased by 2 or more times. It is not desirable to spread the area of contact at the area of adhesion that initiates the formation of pitting. The presence of defective surface area on the level of contact strength does not have significant influence, because of the running-in period, but increases the risk of spalling and brittle fracture.

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“…In this paper, we consider low-velocity impact as the most common in construction practice and can be used for non-destructive testing of structures. The method of non-MATEC Web of Conferences 196, 01001 (2018) https://doi.org/10.1051/matecconf/201819601001 XXVII R-S-P Seminar 2018, Theoretical Foundation of Civil Engineering destructive test is considered in [1][2][3] on the basis of conical indentation and the number of mechanical characteristics is determined with the special device.…”

Section: Introductionmentioning

confidence: 99%

Dynamic response of a plate laying on elastic base during the impact of a conical indenter

et al. 2018

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The article presents an analytical and numerical study of a dynamic conical indentation during impact process. The circular plate laying on the elastic base is subjected to impact load by the conical indenter. Local deformations in imprint zone are considered as elastic-plastic and general plate deformations are only elastic. According to Timoshenko method, the general plate displacement is considered as the sum of the elastic-plastic displacement of the indenter and the elastic displacement of the plate at the impact point. The solution is constructed with Fourier transforms and the Green function of the dynamic process is obtained. The numerical study of impact indentation is received by FEM method. The dependences of displacements, velocities, and accelerations of the plate on time is obtained during impact. The experimental data obtained with the special device is compared with the results of the numerical analysis. The method of an assessment of the mechanical characteristics of steel is proposed on the basis of the research. Analysis of the dynamic response and non-stationary effects on structural elements is carried out on the base of the calculated impact process.

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Non-destructive test of steel structures by conical indentation

Cited by 23 publications

References 11 publications

Static analysis of a reinforced bimodulus beam on elastic foundation

Static analysis of a reinforced bimodulus beam on elastic foundation

The Contact Mechanics of Novikov’s Surface-Hardened Gearing during Running-in Process

Dynamic response of a plate laying on elastic base during the impact of a conical indenter

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