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A fatigue lifetime measuring method for anisotropic material structural parts

An anisotropic and fatigue life technology, applied in the field of anisotropic materials for aero-engines and their structural parts

Active Publication Date: 2015-01-28
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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Problems solved by technology

[0004] The present invention is designed to provide a method for measuring the fatigue life of anisotropic material structural parts in view of the above-mentioned existing technical conditions. This method can fully utilize the advantages of the Hill yield criterion to characterize the anisotropic fatigue behavior of materials and effectively solve For the modeling and determination of fatigue life of anisotropic materials and their structural parts under the condition of arbitrary crystal orientation, the Gauss-Newton optimization algorithm is used to solve the Hill equivalent strain efficiently and quickly, so as to realize the anisotropic material and its structural parts Accurate and reliable fatigue life determination

Method used

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  • A fatigue lifetime measuring method for anisotropic material structural parts
  • A fatigue lifetime measuring method for anisotropic material structural parts
  • A fatigue lifetime measuring method for anisotropic material structural parts

Examples

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example 1

[0091] Example 1, the fatigue life measurement of the smooth sample of single crystal superalloy DD6, figure 1 Adopt technical scheme of the present invention to carry out the flowchart of life measurement process, its steps are:

[0092] 1. Carry out high temperature tensile and fatigue tests

[0093]For smooth samples of DD6 alloy, tensile and low-cycle fatigue tests on characteristic crystal orientations were carried out at a test temperature of 760°C. The high-temperature tensile test method is implemented according to the GB / T4338-1995 standard, and the low-cycle fatigue test method is implemented according to the GB / T15248-2008 standard. The elastic constants of the DD6 alloy [001] crystal-oriented smooth samples were obtained after high-temperature tensile tests, as shown in Table 1. The low-cycle fatigue test adopts the strain control method, the strain ratio is -1, and the strain rate is 5×10-3 / s. The corresponding fatigue life at the test strain level is obtained, ...

example 2

[0113] Example 2. Fatigue life measurement of single crystal superalloy DD6 thin plate structure with holes. DD6 thin plate structure with holes is mainly used to simulate the turbine blade assembly of aero-engine, and the 2mm thick sheet is used to simulate the thin-wall effect of the turbine blade assembly , the central circular hole is used to simulate the stress / strain concentration effect of the film cooling hole in the turbine blade assembly. The stress-strain finite element calculation, life modeling and measurement of thin plate structures with holes under fatigue loads have important guiding significance for the structural optimization design and mechanical behavior analysis of actual turbine blade components. figure 1 Adopt technical scheme of the present invention to carry out the flowchart of life measurement process, its steps are:

[0114] 1. Establish the finite element model of DD6 thin plate structure with holes

[0115] The geometric dimensions of DD6 thin p...

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Abstract

The invention discloses a fatigue lifetime measuring method for anisotropic material structural parts and belongs to the field of service lifetime analysis and measurement for engine turbine blades. The objective of the invention is to overcome the problem of fatigue life measurement in different crystal orientations for anisotropic materials and structural parts thereof. According to the principles of the fatigue lifetime measuring method, a load condition in a load coordinate system is converted into a load condition in a material coordinate system through coordinate transformation; and based on mechanisms of fracture of the anisotropic materials, a novel form of Hill equivalent strain is provided, and a local strain method in a uniaxial form is expanded to conditions of complex strain. A load at any orientation can be uniformly allowed to be equivalent to a specific crystal orientation to obtain an equivalent load by the fatigue lifetime measuring method. A fatigue lifetime measuring model is built according to material parameters and the equivalent load in the orientation. The fatigue lifetime measuring method is advantageous in that: the fatigue lifetime of the anisotropic materials and the structural parts thereof at any orientation can be accurately measured by only using the material parameters and the equivalent load in the specific crystal orientation, and measurement precision is high.

Description

technical field [0001] The invention relates to a method for measuring the fatigue life of anisotropic material structural parts, which belongs to the field of life measurement and analysis of high-temperature structural materials and structural parts, and particularly relates to anisotropic materials and structural parts for aeroengines. Background technique [0002] Superalloy is a high-temperature structural material developed with the development of modern aerospace technology. After decades of exploration and development, developed countries in the world have basically established their own superalloy system, which is mainly used for engine turbine blades. , turbine disk and combustion chamber and other ancillary high temperature resistant structures, etc. The United States, Europe and other developed countries are driven by the development of their aerospace industry, especially the great demand for high-temperature-resistant structural materials for aero-engines, and ...

Claims

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Application Information

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IPC IPC(8): G01N3/00
Inventor 董成利于慧臣李影
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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