A Method for Predicting Strain in Multiaxial Creep Failure of Materials
A prediction method and prediction equation technology, applied in the field of strain prediction, can solve the problems of lack of physical meaning, unreasonable multi-axial creep failure strain prediction, etc., and achieve accurate prediction effect
Active Publication Date: 2018-08-28
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology
Although the multiaxial creep ductility factor can be easily used to model creep crack growth and give acceptable prediction results, it lacks due physical meaning, and in some cases, the Cocks-Ashby MCDF is more Prediction of shaft creep failure strain is unreasonable and needs improvement
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[0035] Figure 1~7 It is the best embodiment of the present invention, below in conjunction with attached Figure 1~7 The present invention will be further described.
[0036] like figure 1 As shown, a material multiaxial creep failure strain prediction method is characterized in that: comprising the following steps:
[0037] Step (1), based on the strain damage criterion, according to the microscopic pore growth mechanism, the relationship between the material creep rate and the strain rate is obtained;
[0038] The microscopic pore growth mechanism considers that pores are mainly nucleated and grown on the grain interface (especially on the grain interface perpendicular to the tensile stress), and the fully grown pores will aggregate to form microcracks of grain size (porosity grain size). interface). Finally, the coalescence of microcracks leads to the propagation of macroscopic creep cracks.
[0039] Although vacancy condensation, grain boundary slip, and dislocation ...
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A predicting method for the multiaxial creep failure strain of a material, relating to the technical field of strain prediction. The method is characterized by comprising the following steps: step (1), acquiring the relation between the creep rate and strain rate of a material; step (2), obtaining uniaxial and multiaxial stress state parameters according to the theory of controlling void growth by power-law creep; step (3), indicating a creep failure strain under the actions of uniaxial and multiaxial stresses and obtaining a multiaxial creep ductility factor; step (4), obtaining multiaxial creep failure strain fitting parameters under different stress states so as to obtain a multiaxial creep ductility factor prediction equation; and step (5), predicting the creep failure strain and the life of the material under a multiaxial stress state by using a finite element software. The predicting method for the multiaxial creep failure strain of a material can more accurately predict the multiaxial creep failure strain of the material under a high temperature state by using a creep failure strain calculation method of the material under the multiaxial stress state.
Description
technical field [0001] The invention discloses a material multiaxial creep failure strain prediction method, which belongs to the technical field of strain prediction. Background technique [0002] In the fields of nuclear power, petrochemical and aerospace, many structural components such as heat exchangers work under high temperature and high pressure for a long time, and the entire structure is in a complex multiaxial stress state. Creep and the damage caused by it are the main failure modes of the structure one. Creep-damage failure research under multiaxial stress state is one of the most important links in structural integrity assessment. The forecast is positive. [0003] Aiming at the problem of complicated model parameters, the strain-based continuum damage mechanics model has been paid more and more attention. The model based on strain damage is also called the ductility depletion model. It is believed that when the local creep strain accumulation reaches the cr...
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IPC IPC(8): G06F17/50
CPCG06F30/17G06F30/23G06F2119/06
Inventor 张玉财蒋文春王传龙涂善东王宁
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)