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Inversion optimization algorithm-based creep deformation endurance life prediction method

An optimization algorithm and durable life technology, applied in design optimization/simulation, calculation, computer-aided design, etc., can solve problems such as the difficulty of accurately predicting the durable life of structures

Pending Publication Date: 2021-01-01
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS +1
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Problems solved by technology

[0003] Scholars at home and abroad have done a lot of research on the creep durability of materials used in high-temperature components, and have developed different life prediction methods. However, it is still a difficult problem to accurately predict the durable life of structures under complex stress states.

Method used

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  • Inversion optimization algorithm-based creep deformation endurance life prediction method
  • Inversion optimization algorithm-based creep deformation endurance life prediction method
  • Inversion optimization algorithm-based creep deformation endurance life prediction method

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Embodiment Construction

[0028] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0029] This embodiment discloses a creep large deformation durable life prediction method based on an inversion optimization algorithm, such as figure 1 As shown, the specific steps are as follows:

[0030] Step 1: Obtain the creep displacement-time curves of smooth samples and notched samples of GH4169 nickel-based superalloy at 600°C and 650°C from the designed creep test piece and test plan, and based on the true stress-true The initial constitutive parameters of the two creep constitutive models (time-hardening-Norton model and new creep constitutive model) were obtained by fitting the creep curve of the smooth specimen represented by the strain. See the parameters before optimization in Tables 1-4.

[0031] The specific expression of the time hardening-Norton model equation is:

[0032]

[0033] In the above formula, ε c is the c...

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Abstract

The invention discloses an inversion optimization algorithm-based creep deformation endurance life prediction method, which comprises the following steps of: fitting a creep deformation curve of a smooth sample obtained on the basis of a test to obtain an initial creep constitutive parameter, and performing large deformation finite element calculation on various types of notch samples by adoptingthe initial creep constitutive parameter; and performing inversion optimization on the creep constitutive parameters of the notch sample to minimize the residual sum of the creep deformation curve obtained by calculation and the creep deformation curve obtained by the test so as to obtain the optimal creep constitutive parameters of the notch sample, and performing finite element large deformationcalculation on other different types of notch samples by adopting the optimal creep constitutive parameters so as to achieve accurate prediction of the lasting life of the notch sample. According tothe method, the defect that the difference between the engineering endurance life prediction result and the test result is large is overcome to a certain extent, and the operation is simple.

Description

technical field [0001] The invention belongs to the technical field of high-temperature structural strength, and in particular relates to a method for predicting the long-lasting service life of large creep deformation. Background technique [0002] Under the action of continuous load, the high-temperature components of the aero-engine will undergo irrecoverable creep deformation after a certain period of time, and will fracture and fail after a long enough period of time. The time it takes for a component to fail under constant load is called the enduring life (or stress rupture life) of the component. [0003] Scholars at home and abroad have done a lot of research on the creep durability of materials used in high-temperature components, and have developed different life prediction methods. However, it is still a difficult problem to accurately predict the durable life of structures under complex stress states. When creep failure occurs in the actual structure, a large in...

Claims

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Application Information

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IPC IPC(8): G06F30/23G06F119/04
CPCG06F30/23G06F2119/04
Inventor 胡绪腾胡贤明郭秩维叶文明宋迎东
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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