Method for confirming heat engine multi-shaft stress-strain relationship with dynamic strain aging influence

A dynamic strain, stress-strain technology, applied in the direction of applying stable tension/pressure to test the strength of materials, measuring devices, instruments, etc., can solve problems such as aggravating damage, achieve simple parameter determination, improve the reliability of life prediction, and physical significance. clear effect

Active Publication Date: 2018-07-06
BEIJING UNIV OF TECH
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Problems solved by technology

[0003] This hardening phenomenon will aggravate damage, especially creep and oxidation damage, which account for a large proportion. In order to accurately evaluate damage to improve the reliability of component life prediction, a thermomechanical multiaxial stress that considers the influence of dynamic strain aging is urgently needed Strain relationship determination method

Method used

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  • Method for confirming heat engine multi-shaft stress-strain relationship with dynamic strain aging influence
  • Method for confirming heat engine multi-shaft stress-strain relationship with dynamic strain aging influence
  • Method for confirming heat engine multi-shaft stress-strain relationship with dynamic strain aging influence

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Embodiment Construction

[0041] The present invention is illustrated in conjunction with the accompanying drawings.

[0042] The present invention is further described through the multi-axial fatigue test of the tensile and torsion heat machine. The test material is Ni-based superalloy GH4169, and the loading waveform of strain control is triangular wave. Other loading parameters are shown in Table 1.

[0043] Table 1 Loading conditions of multiaxial fatigue test of tension-torsion heat engine

[0044]

[0045] Among them, Δε eq / 2 is the equivalent amplitude, Δε x / 2 is the axial strain amplitude, Δγ xy / 2 is the shear strain amplitude, is the mechanical phase angle, θ is the thermal phase angle, T is the temperature, and t is the time.

[0046] A method for determining the multiaxial stress-strain relationship of a thermal engine considering the influence of dynamic strain and aging, such as figure 1 As shown, the specific calculation method is as follows:

[0047] Step (1): Determine the ...

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Abstract

The invention discloses a method for confirming a heat engine multi-shaft stress-strain relationship with dynamic strain aging influence. The method comprises the following steps: (1) confirming basicparameters; (2) upgrading stress tensors by accumulating stress tensors; (3) judging whether the stress tensors calculated in the step (2) enter a non-elastic period or not according to yield criterion, if the stress tensors are still in an elastic period, carrying out a next step of calculation in step (5), and if the stress tensors are in the non-elastic period, carrying out a next step of calculation in step (4); (4) according to values of the yield criterion, calculating an accumulation non-elastic strain rate, a non-elastic strain rate tensor, an elastic strain rate tensor, a back stressrate deviator and an isotropic hardening parameter rate, upgrading the back stress rate deviators by accumulating the back stress rate deviators, and upgrading isotropic hardening parameters by accumulating the isotropic hardening parameter rates; and (5) judging whether loading is completed or not, and if loading is completed, acquiring the heat engine multi-shaft stress-strain relationship withthe dynamic strain aging influence.

Description

technical field [0001] The invention belongs to the field of thermal engine multiaxial fatigue strength theory, and in particular relates to a method for determining the thermal engine multiaxial stress-strain relationship considering the influence of dynamic strain and aging. Background technique [0002] Hot-end components are often subjected to cyclic loading in which temperature and mechanical load change simultaneously during equipment start-up, stop and other operations, that is, thermal-mechanical multi-axial fatigue loading, in which materials not only suffer fatigue damage, but also undergo creep that depends on the loading rate and oxidative damage. During the loading process, the evolution of the microstructure will cause the change of the macroscopic mechanical response, and the dynamic strain aging involved in the present invention is a material hardening phenomenon caused by the evolution of the microstructure. [0003] This hardening phenomenon will aggravate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08
CPCG01N3/08G01N2203/0075G01N2203/0222
Inventor 尚德广李道航薛龙刘小冬崔进王灵婉李罗金
Owner BEIJING UNIV OF TECH
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