Probability estimation of the characteristics of fatigue strength and acting stresses in machine components in connection with calculations of strength in high-cycle loading

Kozlov, L. A.; Balashov, B. F.

doi:10.1007/bf01523214

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“…On the basis of the data of performed investigations, we formulate recommendations aimed at increasing the operation reliability of R27-300, R29-300, AL21, and other engines and Angara-type turboexhausters. The application of computers opened a new direction connected with the possibility of numerical simulation of fatigue tests [5,9] by using Markov processes performed to determine the parameters of distributions for various sample sizes. The accumulated results were used to determine the required number of tests for given probabilities of fracture in the course of periodic fatigue tests.…”

Section: Investigation Of the Causes Of In-service Damage To The Bladmentioning

confidence: 99%

“…2. Dependences of the relative fretting-fatigue limit σ a fr on contact pressure p for a steel-steel couple (ÉI961) tempered at 580°C (1-3) and a VT8-VT8-alloy couple (4-6): (1, 4) specimens preliminarily damaged by fretting corrosion; (2,5) specimens in the intact state; (3,6) workpieces tested for fretting fatigue. For compressor blades, it is recommended to apply additional procedures of thermal treatment whose efficiency proves to be much higher (by at least 30%) than the efficiency of traditional methods of surface hardening.…”

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confidence: 99%

“…The optimal temperature modes of these types of treatment depend on the temperature of polymorphic transformation of the alloy [1,2,4]. Crack growth in compressor blades of ÉI961 steel (σ V =100 MPa) (1), VT8 alloy (σ V = 40 MPa) (2), and ÉI473B alloy(3)(4)(5) depending on the number of loading cycles and the state of the surface of the product.…”

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confidence: 99%

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High-Cycle Fatigue of Materials and Parts of Gas-Turbine Engines

Petukhov

2005

Strength Mater

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We present a historical survey of the development of the scientific direction called "Structural Strength" at the Central Institute of Airplane Engine Manufacturing (CIAEM) for the last 30 years in connection with the 100th birthday of Academician S. V. Serensen, founder of this direction in the USSR, and the 75th anniversary of foundation of the CIAEM. We present the principal results obtained by the scientific staff of the Sector of Fatigue Strength of Materials of Gas-Turbine Engines at the CIAEM. In 1941, the Department of Structural Strength was created in the Laboratory of Dynamics and Strength of Engines (since the end of 1940s, it is called the Laboratory of Dynamics and Strength of Gas-Turbine Engines) at the Central Institute of Airplane Engine Manufacturing (CIAEM) on the initiative of S. V. Serensen, Academician of the Ukrainian Academy of Sciences, who headed this department till October 1967.The scientific school of structural strength of materials and parts of airplane engines was founded by S. V. Serensen on the basis of this department. In the course of time, the fundamental, experimental, and research works of this school found wide recognition throughout the world.During the first period of its existence, the most important directions of scientific investigations in the department headed by S. V. Serensen were connected with the following problems:high-cycle fatigue of structural materials for the parts of gas-turbine engines (including full-scale workpieces) and structural elements in broad temperature ranges for different asymmetries of loading cycles with regard for the structural, technological, and operation factors; long-term strength and creep of promising structural materials for given working temperatures and service life; the number of cycles to failure under the action of elevated constant and cyclically varying temperatures (thermal fatigue).Later, S. V. Serensen occupied permanent position at the Institute of Mechanical Engineering of the Academy of Sciences of the USSR and the department was headed by B. F. Balashov.

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Section: Investigation Of the Causes Of In-service Damage To The Bladmentioning

confidence: 99%

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confidence: 99%