Application of finite element method for simulation of stress-strain state in manufacturing of long turbine blades made of high-strength titanium alloys

Leonov, V. P.; Schastlivaya, I. A.; Иголкина, Т. Н.; Kikinov, K. I.; Kropotov, V.A.; Troshin, A. N.

doi:10.1134/s2075113314060069

Cited by 3 publications

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“…The analysis of turbine blades stress-strain state continues to attract attention of mechanical engineers [1][2][3][4][5][6][7], but the focuses in that area are shifted. Initially turbine blades calculations as the beams [8][9][10] predominated, but then the finite element analysis of the three-dimensional models began to displace them [11]. However, the scopes of one-dimensional models are not exhausted.…”

Section: Introductionmentioning

confidence: 99%

One-Dimensional Models in Turbine Blades Dynamics

Елисеев

Moskalets

Oborin

2016

Advances in Mechanical Engineering

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Turbine blades are considered as straight naturally twisted rods. Two models are discussed: Bernoulli-Euler beam and Cosserat rod. Linear theories with the small displacements, rotations and loads are used. The equations of dynamics taking into account bending, twisting, axial and shear deformations and cross links between them are derived. The stiffness coefficients in elasticity relations are defined. In the case of harmonic oscillations, we have for amplitudes the ordinary differential equations solved by means of computer mathematics (Mathcad). As a result normal modes, natural frequencies and also the amplitudes of forced oscillations are obtained. For the Bernoulli-Euler beam the Lagrange-Ritz-Kantorovich variational approach with the approximations of deflections is proposed. The unknown coefficients of approximation depending on time are found by the numerical integration of the Lagrange system of equations. Proposed methods are applied to the calculation of the real turbine blade.

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Section: Introductionmentioning

confidence: 99%

One-Dimensional Models in Turbine Blades Dynamics

Елисеев

Moskalets

Oborin

2016

Advances in Mechanical Engineering

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Vibrations of Turbine Blades as Elastic Shells

Елисеев

Moskalets

2018

Advances in Mechanical Engineering

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Increasing the Durability of Butt-Welded Joints Operating under Cyclic Loads in a Biaxial Stress Field

Lyudmirsky

Leonov

Assaulenko

2022

Vestnik Donskogo gosudarstvennogo tehničeskogo universiteta

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Introduction. In sheet and hull structures operating under pressure, destruction, as a rule, is localized along the transition line from the base metal to the weld metal. Methods of increasing the durability of butt-welded joints, which are aimed at reducing stress concentration and creating favorable residual compression stresses, are described.Materials and Methods. The tests were carried out on an installation for biaxial bending, which created a biaxial stress field. Factory-made coupons and samples with an additionally processed transition zone from the weld metal to the base metal were tested. The effectiveness of further processing is shown by the following methods:– abrading;– grit hardening;– abrading with grit hardening;– melting of the fusion line in argon without filler wire;– melting of the fusion line in argon with filler wire EP-410U;– melting of the fusion line without filler wire with plastic deformation between narrow rollers.Results. The origin, development of destruction, and its features were analyzed using different methods of further processing of joint welds. Confidence spans (95 %) of the origin and development of failures for joint welds and base metal were calculated. The efficiency of the proposed methods for further processing was evaluated.Discussion and Conclusions. An analysis of the effectiveness of methods for increasing the durability of butt-welded joints has shown that the creation of a smooth transition from the weld metal to the base metal reduces significantly the stress concentration. This provides increasing the number of cycles before the onset of destruction and the survivability of compounds. Due to compressive stresses in the near-weld area, it is possible to increase the durability of joint welds. The most effective methods of further processing of welds combine the reduction of stress concentration and the creation of residual compression stresses. The high-tech solution is remelting the transition zone in an argon medium with an additional EP-410U filler wire.

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Application of finite element method for simulation of stress-strain state in manufacturing of long turbine blades made of high-strength titanium alloys

Cited by 3 publications

References 0 publications

One-Dimensional Models in Turbine Blades Dynamics

One-Dimensional Models in Turbine Blades Dynamics

Vibrations of Turbine Blades as Elastic Shells

Increasing the Durability of Butt-Welded Joints Operating under Cyclic Loads in a Biaxial Stress Field

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