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Multi-axis variable-amplitude thermo-mechanical fatigue life prediction method based on critical surface damage

A thermomechanical fatigue and life prediction technology, which is applied in the direction of testing material strength by applying stable shear force, measuring device, and testing material strength by applying repetitive force/pulsation force, can solve the problem of high cost of thermomechanical fatigue test, Achieve the effect of clear physical meaning and low economic cost

Active Publication Date: 2020-04-10
BEIJING UNIV OF TECH
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Problems solved by technology

[0003] Also, thermomechanical fatigue testing is more costly than isothermal fatigue testing

Method used

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  • Multi-axis variable-amplitude thermo-mechanical fatigue life prediction method based on critical surface damage
  • Multi-axis variable-amplitude thermo-mechanical fatigue life prediction method based on critical surface damage
  • Multi-axis variable-amplitude thermo-mechanical fatigue life prediction method based on critical surface damage

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Embodiment Construction

[0047]The present invention is illustrated in conjunction with the accompanying drawings.

[0048] The present invention is further described through the axial-torsion multi-axial luffing thermal-mechanical fatigue test, and the test material is nickel-based superalloy GH4169.

[0049] A damage mechanism based thermomechanical fatigue life prediction method for shaft-torsion multi-axis luffing, such as figure 1 As shown, the specific calculation method is as follows:

[0050] Step (1): Load cycle counting for shaft-torsional multi-axial mechanical loads. Under the action of axial torsional multiaxial thermomechanical loads, the Wang-Brown method is used to count the load cycles of the axial torsional mechanical loads, and determine the load interval of each load cycle;

[0051] Step (2): Calculate the critical plane angle for each load cycle. Under multiaxial loading, there are two planes that bear the maximum shear strain amplitude inside the material, but the directional ...

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Abstract

The invention discloses a shaft torsional multi-axis variable-amplitude thermo-mechanical fatigue life prediction method based on material critical surface damage. The invention relates to the field of multi-axis thermo-mechanical fatigue strength theories. The method includes calculation of a multi-axis mechanical load cycle count, the critical surface angle of each load cycle, the critical surface pure fatigue damage of each load cycle, the total pure fatigue damage of the critical surfaces, stress on the critical surface of the material, an average differential critical surface load history, the critical surface equivalent creep stress of each section, the critical surface creep damage of each section, total creep damage of all critical surfaces, total non-pure fatigue damage of all critical surfaces, total damage of the critical surfaces and predicted service life. The proposed life prediction method can well predict the fatigue life of the alloy material under the shaft torsionalmulti-axis variable-amplitude thermo-mechanical loading.

Description

technical field [0001] The invention belongs to the field of multiaxial thermomechanical fatigue strength theory, and in particular relates to a method for predicting the fatigue life of axial torsion multiaxial variable amplitude thermomechanical fatigue based on material critical surface damage. Background technique [0002] Many practical engineering components are subjected to multiaxial loads during service. Moreover, some of these mechanical structures (such as aero-engine hot-end parts, nuclear power facilities, and pressure vessels) work under the mutual interaction of thermal loads and multi-axis luffing mechanical loads. The fatigue caused by the interaction of thermal load and mechanical load is thermomechanical fatigue. Also, fatigue failure of these mechanical structures can lead to catastrophic consequences. Therefore, it has important engineering practical significance to predict the fatigue life of materials under multi-axial variable-amplitude thermomechan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/32G01N3/24
CPCG01N3/32G01N3/24G01N2203/0071G01N2203/0073G01N2203/0258
Inventor 尚德广侯庚李道航薛龙王海潮陈烽
Owner BEIJING UNIV OF TECH
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