Multi-dimensional predicting method for strength of braided ceramic base composite material

A composite material and prediction method technology, applied in computer material science, instrumentation, computational theoretical chemistry, etc., can solve the problem of inability to analyze the microscopic failure process of woven ceramic matrix composite materials.

Active Publication Date: 2019-06-21
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

However, this method is a phenomenological analysis method that relies on test results

Method used

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  • Multi-dimensional predicting method for strength of braided ceramic base composite material
  • Multi-dimensional predicting method for strength of braided ceramic base composite material
  • Multi-dimensional predicting method for strength of braided ceramic base composite material

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Embodiment example

[0049] Implementation Case: Strength Prediction of Plain Weave SiC / SiC Composites

[0050] Step 1: Obtain the mesoscopic geometric parameters of braided ceramic matrix composites

[0051] The following assumptions are made on the mesoscopic geometry of woven ceramic matrix composites: a) the warp yarn direction curve satisfies the form of trigonometric functions; b) the weft yarn direction is a straight line; c) the shape of the yarn interface is rectangular. Based on the above assumptions, by observing the three-view view of the mesoscopic geometric structure of the woven ceramic matrix composite, the mesoscopic geometric parameters of the woven ceramic matrix composite are obtained, including the amplitude and wavelength of the warp curve, the width of the yarn section, and the height of the warp section. As shown in Fig. 1, it is a three-view view of the mesoscopic geometric structure of the plain weave SiC / SiC composite. The mesoscopic geometric parameters obtained accord...

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Abstract

The invention provides a multi-dimensional predicting method for strength of a braided ceramic base composite material. Firstly a parameterization method is used for establishing a braided ceramic base composite material single-cell model which comprises yarns and a matrix, and then period grid dividing is performed. Afterwards a mesomechanics method is used for simulating the mechanics behavior of the yarn unit. Furthermore a strain conversion matrix is used for converting a yarn element stiffness matrix from a local coordinate system to an integral coordinate system. Finally through applyingan increment type periodic boundary condition, a micro-stress and a strain field of a single cell are calculated. A volume averaging method is used for obtaining a microscopic stress and strain of the braided ceramic base composite material. If a failure unit band which penetrates through the single cell is formed, failure of the braided ceramic base composite material is determined, and the single-cell average stress is the strength of the braided ceramic base composite material. According to the multi-dimensional predicting method, the multidimensional analysis method in which macrography and mesography are combined is utilized. The strength of the braided ceramic base composite material can be accurately predicted without dependence to a large number of experiments with time consumption and high cost.

Description

technical field [0001] The invention belongs to the technical field of composite material strength prediction methods, and in particular relates to a multi-scale prediction method for the strength of braided ceramic matrix composite materials. Background technique [0002] Ceramic matrix composites have many advantages such as high specific stiffness, high specific strength, high temperature resistance, corrosion resistance, low density, etc., and have broad application prospects in the hot end parts of aviation, aerospace, nuclear power and other industries. Ceramic matrix composites can generally be divided into unidirectional, laminated, and braided forms according to their yarn structure. In engineering applications, ceramic matrix composite structural parts are generally braided structures. In order to apply ceramic matrix composites more efficiently and safely, it is necessary to predict the strength of braided ceramic matrix composites. [0003] The mesoscopic geome...

Claims

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Application Information

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IPC IPC(8): G16C60/00G16C10/00G16C20/80
Inventor 高希光董洪年宋迎东张盛于国强
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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