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Method for establishing pyrolytic carbon PyC interface model of ceramic-based composite material and predicting shear strength

A composite material and interface model technology, applied in the fields of instrumentation, electrical digital data processing, computer-aided design, etc., can solve the problem of inability to accurately calculate the interface shear strength of ceramic matrix composites pyrolytic carbon PyC, etc., to avoid the requirements of testing equipment High, avoid sample preparation difficulties, predict the effect of accurate results

Pending Publication Date: 2021-04-16
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0009] The invention provides a method for establishing a PyC interface model of a ceramic matrix composite material and a shear strength prediction method, so as to solve the problem that the shear strength of the PyC interface of a ceramic matrix composite material cannot be accurately calculated in the prior art

Method used

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  • Method for establishing pyrolytic carbon PyC interface model of ceramic-based composite material and predicting shear strength
  • Method for establishing pyrolytic carbon PyC interface model of ceramic-based composite material and predicting shear strength
  • Method for establishing pyrolytic carbon PyC interface model of ceramic-based composite material and predicting shear strength

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Embodiment 1

[0066] In this example, the PyC interface shear strength of the SiC / PyC / SiC composite material at room temperature was predicted.

[0067] A method for predicting the PyC interface strength of ceramic matrix composite material pyrolytic carbon, specifically comprising the following steps:

[0068] Step (1), establishing the PyC interface turbostratic graphite layer unit model: According to the observation results of the microstructure of the PyC interface layer, the carbon layer spacing, the stacking height of the carbon layer, the size of the carbon layer and the order degree of the carbon layer are calculated. Structural parameters establish ordered graphite-like layer units.

[0069] Step (1) specifically includes the following steps:

[0070] Using micro-area XRD and Raman spectroscopy to observe the PyC interface microstructure of SiC / PyC / SiC composites at room temperature, figure 1 is the XRD spectrum of the PyC interface of the SiC / PyC / SiC composite material at room t...

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Abstract

The invention discloses a method for establishing a pyrolytic carbon PyC interface model of a ceramic-based composite material and predicting shear strength, which comprises the following steps: based on an observation result of an actual microstructure of a PyC interface of a ceramic-based composite material, calculating a carbon interlayer spacing, a carbon layer stacking height and a carbon layer size of an ordered graphite-like layer unit of the PyC interface; establishing a PyC interface three-dimensional disordered layer structure model in which a short-range ordered carbon layer and amorphous free carbon coexist, combining a ceramic matrix composite fiber and matrix structure model, adopting a molecular dynamics method to simulate a ceramic matrix composite fiber push-in test process, and accurately predicting a stress-strain curve of a PyC interface shearing process; wherein the stress value corresponding to the highest point of the curve is the PyC interface shear strength. An accurate modeling method is provided for the PyC interface of the ceramic matrix composite, the shear strength of the interface can be simply, conveniently and effectively predicted, and important interface shear strength parameters are provided for later calculation of the mechanical property of the ceramic matrix composite.

Description

technical field [0001] The invention belongs to the technical field of composite materials, in particular to a method for establishing a pyrolytic carbon PyC interface model and predicting shear strength of a ceramic matrix composite material. Background technique [0002] Ceramic matrix composites (Ceramic Matrix Composites, CMCs) have excellent properties such as high temperature resistance, low density, high specific strength, and high specific modulus, and have broad application prospects in hot-end components such as aero-engine combustors, turbines, and exhaust nozzles. . [0003] The properties of the interface are very important to the toughening mechanism of composite materials, and have a great influence on the mechanical properties of composite materials such as strength, stiffness, stress-strain behavior and failure mode. At present, there are many kinds of interfacial materials in ceramic matrix composites. Pyrolytic carbon (PyC) interfaces are considered to b...

Claims

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Application Information

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IPC IPC(8): G06F30/20G06F113/26G06F119/14
CPCY02T90/00
Inventor 孙志刚卞杰刘晋辰陈西辉牛序铭丁俊杰
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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