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Ceramic-based composite material strength prediction method considering bearing of broken fibers

A technology for composite materials and strength prediction, applied in computer materials science, special data processing applications, instruments, etc., can solve the problems of fiber loss of load capacity, reduction of fiber volume fraction, failure to consider the load capacity of broken fibers, etc., to achieve the goal of improving accuracy Effect

Active Publication Date: 2019-10-08
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

Existing methods for predicting the strength of ceramic matrix composites are often based on fiber strength to predict the strength of ceramic matrix composites. J].Journal of Composite Materials, 2008, 25(04): 154-160], all think that after the fiber breaks somewhere, the whole fiber loses its bearing capacity, and they regard fiber breakage as the equivalent of fiber volume fraction reduced, without considering the load-carrying capacity of the broken fibers

Method used

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  • Ceramic-based composite material strength prediction method considering bearing of broken fibers
  • Ceramic-based composite material strength prediction method considering bearing of broken fibers
  • Ceramic-based composite material strength prediction method considering bearing of broken fibers

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Embodiment

[0040] In order to enable those skilled in the art to better understand the technical solutions and beneficial effects of the present application, the present application conducts strength prediction for SiC / SiC ceramic matrix composites in the examples. Each fiber in the SiC / SiC ceramic matrix composite material is equally divided into many fiber micro-units, and the length of each micro-unit is Δl=0.02mm. In this embodiment, the SiC fiber strength distribution is as follows:

[0041] Table 1 Defect parameters of SiC fibers at different levels

[0042]

[0043] S in the table j Indicates the strength of the jth level defect, P(A j ) means the length is L f = The probability of the jth level defect appearing on the fiber of 25mm. From P(A in Table 1 j ) to calculate the probability of defects at all levels appearing on fiber microelements Use a computer to generate a random number ξ (0j , then it is considered that there is the jth type of defect on the micro-element...

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Abstract

According to a ceramic matrix composite strength prediction method considering bearing of broken fibers, in a ceramic matrix composite, the broken fibers have certain bearing capacity due to the loadtransmission effect of the interfaces between the fibers and a matrix. According to the method, the continuous bearing of the broken fiber is considered, the method for judging the fiber breakage position is given, the stress of the broken fiber on the crack plane of the matrix is calculated, the strength of the ceramic matrix composite material is finally obtained, and the precision of a prediction result can be greatly improved.

Description

technical field [0001] The invention belongs to the field of prediction of mechanical properties of composite materials, and in particular relates to a strength prediction method of a ceramic matrix composite material considering the bearing capacity of broken fibers. Background technique [0002] Fiber-reinforced ceramic matrix composites have shown great development potential in the application of aero-engine hot-end parts due to their low density and high temperature resistance. Strength is one of the most important properties of ceramic matrix composites, and the structural design of ceramic matrix composites requires designers to accurately predict the strength of materials. Existing methods for predicting the strength of ceramic matrix composites are often based on fiber strength to predict the strength of ceramic matrix composites. J].Journal of Composite Materials, 2008, 25(04): 154-160], all think that after the fiber breaks somewhere, the whole fiber loses its bea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G16C60/00
CPCG16C60/00G06F30/18G06F30/20
Inventor 张盛高希光宋迎东
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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