Prediction method for high-cycle fatigue life of single crystal air film hole member

A high-cycle fatigue and prediction method technology, applied in special data processing applications, instruments, electrical and digital data processing, etc., can solve problems such as difficult damage assessment and prevention, complex failure mechanism regions, and no obvious plastic deformation of components, achieving decentralized Small performance, high precision, and avoid nonlinear effects

Pending Publication Date: 2018-07-27
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0003] The cyclic stress amplitude of high-cycle fatigue is below the yield strength of the material, and the damage and plastic deformation are seriously localized. Therefore, the linear damage accumulation criterion is not suitable for high-cycle fatigue
Single crystal alloys have anisotropic properties in structure, and microscopically, the deformation mechanism is dominated by crystal slip. The traditional elastopl

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  • Prediction method for high-cycle fatigue life of single crystal air film hole member
  • Prediction method for high-cycle fatigue life of single crystal air film hole member
  • Prediction method for high-cycle fatigue life of single crystal air film hole member

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[0047] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms, and should not be construed as being limited to the examples set forth herein; on the contrary, the provision of these embodiments makes the present disclosure more comprehensive and complete, and fully conveys the concept of the example embodiments To those skilled in the art. The described features, structures or characteristics can be combined in one or more embodiments in any suitable way.

[0048] In addition, the drawings are only schematic illustrations of the present disclosure, and are not necessarily drawn to scale. The same reference numerals in the figures indicate the same or similar parts, and thus their repeated description will be omitted. Some of the block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entitie...

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Abstract

The invention provides a prediction method for high-cycle fatigue life of a single crystal air film hole member, and relates to the technical field of porous mediums. The method comprises the steps ofdetermining a dangerous path according to a hole distribution mode of the single crystal air film hole member; building a crystal plasticity theory model, and inputting related parameters of the crystal plasticity theory model to a finite element model; outputting stress distribution of the dangerous path through the finite element model, and obtaining a maximum main stress amplitude and a maximum resolved shear stress amplitude on the dangerous path; and building a critical distance model, determining parameters of the critical distance model according to the maximum main stress amplitude and the maximum resolved shear stress amplitude, and performing calculation by an iterative program to obtain the high-cycle fatigue life of the single crystal air film hole member. According to the method, anisotropic material properties of single crystal and a deformation mechanism of crystal slip are considered; the difficult problem of high-cycle fatigue damage nonlinearity is solved; and a prediction result is small in dispersity and high in precision.

Description

technical field [0001] The present disclosure relates to the technical field of porous media, in particular to a method for predicting the multiaxial high cycle fatigue life of nickel-based single crystal gas film hole components. Background technique [0002] Nickel-based single-crystal alloys are used as turbine blade materials, which improves the comprehensive performance of the blades to a new level. Compared with other alloys, the nickel-based single crystal superalloy eliminates the grain boundary, fundamentally eliminates the damage at the grain boundary, and greatly improves the mechanical properties of the material at high temperature. With the increase in the temperature requirements of the engine inlet, the solid blades are far from meeting the temperature requirements, and the hollow cooling blades came into being. The application of air film cooling has greatly improved the temperature bearing capacity of the blades. The air film hole in the blade destroys the ...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/17G06F2119/06G06F30/23
Inventor 温志勋毛倩竹吴云伍岳珠峰
Owner NORTHWESTERN POLYTECHNICAL UNIV
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