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A notch part local stress-strain calculation method under a high-temperature multi-axis load

A stress-strain and calculation method technology, which is applied in calculation, special data processing applications, instruments, etc., can solve the problems of time-consuming, large amount of calculation for strain analysis, etc., and achieve the effect of reducing human-computer interaction

Pending Publication Date: 2019-06-18
BEIJING UNIV OF TECH
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Problems solved by technology

Finite element software can perform nonlinear analysis and calculation, but the calculation amount of local stress-strain analysis of notched parts under complex loading is very large and time-consuming, so the optimization program that can perform calculation analysis in a short time is very important

Method used

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  • A notch part local stress-strain calculation method under a high-temperature multi-axis load
  • A notch part local stress-strain calculation method under a high-temperature multi-axis load
  • A notch part local stress-strain calculation method under a high-temperature multi-axis load

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Embodiment Construction

[0050] The specific embodiment of the present invention will be described with reference to the accompanying drawings.

[0051] The present invention has been further illustrated by finite element simulation, and the theoretical stress concentration factors in various directions of the root of the notch are simulated by finite element, and the structural diagram of the engineering test piece and the finite element model are as follows: figure 1 shown. The theoretical stress concentration factors in the three directions at the root of the notch are calculated by finite element simulation to be 1.95, 0.34 and 1.4, respectively. The material constants in the constitutive model are shown in Table 1. The material constants are fitted by uniaxial tests. The test material is a nickel-based superalloy GH4169, which is a turbine disk material of an aeroengine, and the test temperature is 650 °C.

[0052] Table 1 Material constants

[0053] E

k

Z

n

Q

b

...

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Abstract

The invention discloses a notch part local stress-strain calculation method under high-temperature multi-axis loading. The notch part local stress-strain calculation method comprises the steps of analyzing and determining a notch part local stress-strain state under high-temperature multi-axis loading; Reading seven real stress strains and constitutive model variable parameters in the previous step, and calculating a yield function f1 in the previous step; Calculating nominal stress and strain, and determining loading; Judging whether the current loading is elastic loading or plastic loading by utilizing the yield function in the last step; Calculating a yield function f2 under the current loading step and judging; And storing all real stress strains and constitutive model variable parameters, and returning to carry out next-step solving calculation until the loading is finished. According to an algorithm program prediction result and a finite element simulation result of the method, it is found that the stress-strain peak-valley value is close to the shape of the hysteresis loop. The prediction result shows that the method can be used for well calculating the local stress-strain response of the notched part under the high-temperature multi-axis loading.

Description

technical field [0001] The technical field of the present invention is the direction of fatigue constitutive relationship, in particular a method for calculating local stress and strain of notched parts under high temperature multiaxial loading. Background technique [0002] In practical applications, such as aerospace, automobiles, high-speed trains, ships, and heavy machinery, key components inevitably contain gaps, and must also withstand the interaction of high temperature loads and multi-axis mechanical loads. The existence of notches leads to stress concentration and induces local plastic deformation, and the accumulation of plastic deformation can cause fatigue failure of components. Therefore, it is of great engineering significance to study the stress-strain characteristics and damage mechanism of high temperature multiaxial fatigue cycles of notched parts. [0003] At present, most studies on the constitutive relationship of notched parts stay at room temperature....

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCY02T90/00
Inventor 尚德广李志高王灵婉李磊李冰垚王金杰
Owner BEIJING UNIV OF TECH
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