Method for predicting fatigue damage of fiber-reinforced ceramic-based composite material through tangential modulus
A composite material, fiber reinforced technology, applied in computer material science, special data processing applications, instruments, etc., can solve the problems of fatigue damage of fiber reinforced ceramic matrix composite materials that have not yet been established
Pending Publication Date: 2022-03-04
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
View PDF0 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
In order to ensure the reliability and safety of fiber-reinforced ceramic matrix composites during use, it is necessary to carry out in-depth research on their fatigue damage and durability. At present, no method has been established to predict the fatigue damage of fiber-reinforced ceramic matrix composites through tangent modulus.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0108] In this example, the braided SiC / SiC ceramic matrix composite is used as the test sample, and the fatigue damage of the fiber reinforced ceramic matrix composite is predicted by the tangent modulus:
[0109] Provide parameters: V f = 0.35, r f = 7.5 μm, E f =200GPa,E m =300GPa, α f =3×10 -6 / °C,α m =4×10 -6 / °C,τ i =40MPa, Γi =5J / m 2 , m f =5,σ fc =2.0GPa;
[0110] The preparation temperature of the composite material is 1020°C, and the test temperature is 20°C, then ΔT=-1000°C;
[0111] Then the tangent modulus of fiber reinforced ceramic matrix composites is obtained according to formulas 1-11, and then the prediction of fatigue damage of fiber reinforced ceramic matrix composites is realized.
[0112] figure 1 It is a comparison diagram of the hysteresis loop of the fiber reinforced ceramic matrix composite material predicted by experiment and theory in the present invention, figure 1 The middle solid line is the actual test data, and the dotted line is...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention provides a method for predicting fatigue damage of a fiber-reinforced ceramic-based composite material through tangential modulus, and belongs to the technical field of composite material fatigue damage prediction. According to a total load bearing criterion, a complete fiber bearing load at a peak stress position in unloading and reloading processes is obtained, and on the basis, an interface debonding length and a slippage length (including an unloading interface reverse slippage length and a reloading new interface slippage length) are obtained according to a fracture mechanical interface debonding criterion; meanwhile, according to a matrix random breaking model, determining matrix crack spacing, and on this basis, obtaining a stress-strain relation equation of the fiber-reinforced ceramic matrix composite material in the unloading and reloading processes, so as to obtain the tangential modulus of the fiber-reinforced ceramic matrix composite material in the unloading and reloading processes; and predicting the fatigue damage of the fiber-reinforced ceramic-based composite material. According to the method provided by the invention, the fatigue damage of the fiber reinforced ceramic matrix composite material can be accurately predicted through the tangent modulus.
Description
technical field [0001] The invention relates to the technical field of fatigue damage prediction of composite materials, in particular to a method for predicting fatigue damage of fiber-reinforced ceramic matrix composite materials through tangent modulus. Background technique [0002] Fiber-reinforced ceramic matrix composites have the advantages of high temperature resistance, corrosion resistance, low density, high specific strength, and high specific modulus. Compared with superalloys, fiber-reinforced ceramic matrix composites can withstand higher temperatures, reduce cooling airflow, and improve turbine performance. Efficiency has been applied to aero-engine combustors, turbine guide vanes, turbine shell rings, and exhaust nozzles. [0003] In order to ensure the reliability and safety of fiber-reinforced ceramic matrix composites used in aircraft and aero-engine structures, researchers at home and abroad regard the development of performance evaluation, damage evoluti...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G16C60/00G06F113/26G06F119/14
CPCG06F30/20G16C60/00G06F2113/26G06F2119/14
Inventor 李龙彪
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS