Contact Interaction of Turbine Blade Interlock Elements Under Creep

Shulzhenko, M. H.; Palkov, Ihor; Palkov, Serhii A.

doi:10.1007/s11223-022-00419-x

Cited by 2 publications

(1 citation statement)

References 16 publications

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“…As soon as cracks can appear due to various kinds of deformation, the nature of cracks origination owing to creep and thermal fatigue on the example of turbine disks and blades via the method of finite element analysis [11,12]. Assessment methods of stress state of disks, turbine blade and interlocks of turbine equipment are considered in the researches [13,14]. As soon as turbine blades, especially rotating blades, are operating in the conditions of cyclic loading, the problem of fatigue destruction is very important.…”

Section: Introductionmentioning

confidence: 99%

Optimal distribution of capsules with active substance for the crack detection system in a turbine blade body

Andrianov,

Chepurnova

2023

cisisr

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This research is devoted to optimization of the detection system for damages of blades of a gas turbine engine in non-stationary conditions. The system is based on the approach on the method, when capsules with active substance are placed in a steel blade body, then a capsule is bursting due to difference of pressures during the process of crack propagation; as a result, ejected active substance is registered. The problem of this research is connected with optimal distribution of capsules, which contain active substance, in a turbine blade body. The research technique was developed for a modeling problem, when a steel turbine blade with constant cross section, having tensile crack and subjected to the action of extension centrifugal force, was observed. Development of the model with optimal distribution of capsules was based on assessment of pre-critical crack growth: it was required to distribute the capsules along the median line of blade cross section in such way, that it would be possible to detect the crack of pre-critical growth. Analysis of ultimate state of a blade with crack was carried out on the base of stress intensity coefficient, which allows to take into account the feature of crack location and to determine its critical length when its accelerated growth takes place. Variation of the pressure inside a capsule, required for its bursting depending on opening of crack sides. The suggested model takes into account location of the capsule with active substance relating to crack opening sides. Calculation of minimal number of capsules in blade bode depending on pressure inside the capsule and rotating speed of blades was conducted on the example of the steel turbine blade R-5530 B. The obtained dependences allow us to find the optimal combination between the geometric and physical characteristics of the crack detection system and the minimal number of capsules. The application of the proposed approach to the optimal distribution of capsules along the median line of the blade cross section will increase the efficiency of use of the damage detection system in turbine blades in non-stationary conditions, thereby ensuring the safety of operation of gas turbine engines in aviation technology.

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Section: Introductionmentioning

confidence: 99%

Optimal distribution of capsules with active substance for the crack detection system in a turbine blade body

Andrianov,

Chepurnova

2023

cisisr

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Creep damage and fracture of turbine blade roots

Breslavsky,

Mietielov,

Senko

et al. 2024

Proceedings of the Institution of Mechanical Engineers, Part L:

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An approach to modeling creep fracture under a complex stress state using the Finite Element Method is proposed. The model of the turbine blade root was studied. The methodology of the transition in the analysis from the general 3D to the 2D stress state is proposed. For the models of the roots, the characteristics of the damage accumulation were obtained and the analysis of subsequent fracture in roots made of different materials was performed.The novel results of the description the creep fracture behavior after the period of damage accumulation were obtained. Based on the analysis of the numerical results, it was established that for different materials qualitatively different fracture processes occur in different places of the blade root. They were as follows: the fracture with separation of the main part of the root between the lower teeth; destruction of a separate tooth with a transition inside the root, as well as of a separate tooth jointly with the root’s lower part. A novel approach to obtaining the form of an equation for description the current length of a creep crack by use of numerical results is proposed.

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Contact Interaction of Turbine Blade Interlock Elements Under Creep

Cited by 2 publications

References 16 publications

Optimal distribution of capsules with active substance for the crack detection system in a turbine blade body

Optimal distribution of capsules with active substance for the crack detection system in a turbine blade body

Creep damage and fracture of turbine blade roots

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