One-way ceramic matrix composite creep behavior prediction method

A technology of composite materials and prediction methods, which is applied in the fields of analytical materials, computer materials science, measuring devices, etc., can solve the problems of high cost and time-consuming experimental methods, and achieve the effect of overcoming high cost and simple and efficient process

Active Publication Date: 2020-04-17
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

On the other hand, the entire calculation process is simple and efficient, overcoming the shortcomings of high cost and time-consuming experimental methods

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  • One-way ceramic matrix composite creep behavior prediction method
  • One-way ceramic matrix composite creep behavior prediction method
  • One-way ceramic matrix composite creep behavior prediction method

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Embodiment Construction

[0068] In order to better understand the technical content of the present invention, specific embodiments are given together with the attached drawings for description as follows.

[0069] combine figure 1 , the present invention proposes a method for predicting the creep behavior of unidirectional ceramic matrix composites, comprising the following steps:

[0070] (1) For a certain creep stress and creep time, the fiber and matrix stress in the bonding zone of the unidirectional ceramic matrix composite is obtained. During the creep process of unidirectional ceramic matrix composites, assuming that the fiber and matrix strains in the bonded region are the same, the stresses of the fibers and matrix in the bonded region satisfy the following equations:

[0071]

[0072] Among them, σ f0 ,σ m0 are the fiber and matrix stresses in the bonding zone, respectively, E f ,E m is the elastic modulus of fiber and matrix, v f .v m are the volume fractions of fibers and matrix,...

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Abstract

The invention discloses a one-way ceramic matrix composite creep behavior prediction method, which comprises the following steps: based on the same strain of bonding region fibers and a matrix, obtaining the stress of the bonding region fibers and the matrix under different creep stresses and times, and further obtaining the change of the matrix crack density. A shear-lag model is combined to obtain fiber stress change in the creep process, fiber failure and load borne by the failure fiber are considered, and finally a one-way ceramic matrix composite creep curve is calculated. According to the method, one-way ceramic matrix composite creep curves at different temperatures and creep stress levels can be accurately predicted, and the microscopic failure mechanism of material internal components is disclosed. On the other hand, the whole calculation process is concise and efficient, and the defects of high cost and long time consumption of an experimental method are overcome.

Description

technical field [0001] The invention relates to the technical field of prediction of creep behavior of composite materials, in particular to a method for predicting creep behavior of unidirectional ceramic matrix composite materials. Background technique [0002] With the development of aero-engine technology and the improvement of its performance, in addition to the improvement and optimization of the design scheme, higher requirements are also put forward for the materials used in aero-engines. Ceramic matrix composites (CMCs) have been widely used in the hot end parts of aeroengines, such as exhaust nozzles, regulators, combustion chamber flame tube linings, due to their high specific strength, high specific modulus, and excellent high temperature resistance. sets and so on. [0003] In the actual service environment of aero-engines, the structural parts of ceramic matrix composites are subjected to the combined action of high temperature and load, and the material will ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/00G01N3/06G16C60/00
CPCG01N3/00G01N3/06G01N2203/0075G01N2203/0096G01N2203/0214G01N2203/0226G01N2203/0676G01N2203/0682G16C60/00
Inventor 宋迎东韩笑高希光鞠晓蓉于国强张盛
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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