Life of thermally stressed machine parts

Birger, I. A.; Dem'yanushko, I. V.; Temis, Yu. M.

doi:10.1007/bf01533638

Cited by 16 publications

(16 citation statements)

References 1 publication

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“…The Kirsch problem is of particular interest because elliptical cutouts are key design features in various engineering applications. In addition to practical interest, this problem has an analytical solution in the classical case, based on which the maximum stress level at the upper and lower points of the ellipse is equal to [29]

\begin{equation} \overline{\sigma }_{11}^{max} = {\left(1 + 2 \frac{R_2}{R_1} \right)} \widetilde{\sigma }, \end{equation}

where

\widetilde{\sigma }

is the tensile stress. Having carried out a series of computational experiments, Table 1 with the values of the maximum stress level depending on the ratio of the lengths of the notch semiaxes and the weight parameter p 1 was obtained.…”

Section: Calculation Resultsmentioning

confidence: 99%

“…The uniform mesh 𝑆 ℎ is introduced with the characteristic element size ℎ = 0.005, the following boundary conditions are given The Kirsch problem is of particular interest because elliptical cutouts are key design features in various engineering applications. In addition to practical interest, this problem has an analytical solution in the classical case, based on which the maximum stress level at the upper and lower points of the ellipse is equal to [29]…”

Section: Kirsch Problem With Generalization To Elliptic Cutoutsmentioning

confidence: 99%

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2D nonlocal elasticity: Investigation of stress and strain fields in complex shape regions

2022

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The paper presents the features of solutions to nonlocal elasticity problems in domains with stepped transitions and elliptical notches. A comparative analysis of the solutions obtained in the classical and nonlocal elasticity theories was carried out, as well as an analysis of the influence of the main parameters of the model on the final results. The presented solutions for the region with a step transition are in qualitative agreement with the experimental data and have similar portraits of deformations and resultant stresses along the loading axis. In regions with elliptical notches, similar effects are observed. In addition to qualitative agreement with experiments, solutions in the nonlocal formulation have lower stress values in the concentrators and exhibit edge effects, which are characterized by sharp stress and strain gradients at the domain boundaries. The solutions were carried out numerically by the finite element method.

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\begin{equation} \overline{\sigma }_{11}^{max} = {\left(1 + 2 \frac{R_2}{R_1} \right)} \widetilde{\sigma }, \end{equation}

where

\widetilde{\sigma }

Section: Calculation Resultsmentioning

confidence: 99%

Section: Kirsch Problem With Generalization To Elliptic Cutoutsmentioning

confidence: 99%

2D nonlocal elasticity: Investigation of stress and strain fields in complex shape regions

2022

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“…Note also that the use of the finite element method for the solution of problems of fracture mechanics is widely used [17].…”

Section: Methodsmentioning

confidence: 99%

Models of Fatigue Fracture Under Cyclic Loading Pistons of Internal Combustion Engines

Гоц

2018

Proceedings of the 4th International Conference on Industrial Engineering

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The crack on the piston under cyclic loading is the result of repetitive elastic and plastic deformations distributed unevenly throughout the volume. The microcracks from fatigue occur in repeated elastic and plastic deformations in the individual parts or sections throughout the volume of piston, that is, the precursor of cracks. However, a piston with a microcrack can work practically all the resource if there is no crack propagation. The crack creates its own stress field which is determined by the stress intensity factor characterizing the stress concentration at the crack tip and depends on the load, forms of a detail, crack size, and the anisotropy of the material. For the analytical description of the crack growth rate, it has been proposed more than 60 formulas and they are all based on the fact that all processes occurring at the crack tip and the rate of crack growth of the number of cycles depend on the stress concentration factor. The magnitude of the stress intensity factor allows one to judge about the stability or instability of cracks. The crack is called stable if it is not growing or its growth is linearly dependent on the load. When you select the corresponding operating mode of the engine, the crack on the edge of the combustion chamber of the piston may not develop and this way you can ensure that the crack has not increased its size. The crack would be unstable if its distribution only slightly depends on the load.

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“…In [12], the authors investigated the kinematic-working scheme of the SC and the results of studying the effect of the technological load on the bending of the SC shaft, a method for calculating the deflection and technological parameters (clearances), in particular, between the SC saws and the grate, which should be set in accordance technological regulations. The process of bending oscillations of the SC of a fiber separator is considered, the design of which consists of steel saws and aluminum spacers sequentially mounted on a steel shaft.…”

Section: Introductionmentioning

confidence: 99%

Shafts of technological machines with combined supports

Yunusov,

Kenjayev,

Makhmudova

2023

E3S Web of Conf.

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This article discusses experimental studies of a saw cylinder (SC) composite shaft with combined support. We proposed a new design of the support that provides a reduction in the shaft. The article considers the influence of changing the parameters of the elastic element of the support of the composite shaft (CS) of the SC using the ANSYS software, calculates and analyzes the reaction forces of the supports for different parameters of the elastic elements, and also considers the effect on the stresses of the system, as well as the results of experimental and comparative tests in production conditions on the SC of the cotton gin machines with a composite bearing, where the parameters of the elastic element differ from each other by different elasticity. The fiberization process took place according to the established technological parameters. The experimental and standard SC models were compared during the experiment.

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Life of thermally stressed machine parts

Cited by 16 publications

References 1 publication

2D nonlocal elasticity: Investigation of stress and strain fields in complex shape regions

2D nonlocal elasticity: Investigation of stress and strain fields in complex shape regions

Models of Fatigue Fracture Under Cyclic Loading Pistons of Internal Combustion Engines

Shafts of technological machines with combined supports

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