Rapid prediction method for a fatigue limit of a ceramic-based composite material
A composite material and fatigue limit technology, which is applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of taking a lot of time to measure, unable to quickly judge materials, etc., and achieve the effect of improving accuracy
Active Publication Date: 2019-06-04
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
View PDF5 Cites 4 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0004] Aiming at the deficiencies in the prior art, the present invention provides a rapid prediction method for the fatigue limit of ceramic matrix composite materials, aiming to solve the problem that it takes a lot of time to measure the fatigue life of ceramic matrix composite materials in practical applications, which leads to the inability to quickly judge whether the material can be used The problem of meeting the never-fatigue requirement in a certain working environment
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
[0036] Example: The selected material is SiC / SiC small composite material, a composite material with SiC matrix and SiC fiber as the main structural components, and its mechanical model is as follows figure 1 Shown is the representative voxel of ceramic matrix composites under general fatigue state.
[0037] 1. In the fatigue process of small composite materials, after the matrix cracks, interface debonding will occur due to the action of the stress field at the tip, such as figure 1 As shown, there are both debonding zones and bonding zones between the cracks at the beginning, and as the number of cycles increases, crack propagation, interface wear degradation, and interface strength decrease. Therefore, when the material is not broken, when the load generated When the interfacial shear stress is greater than the critical bond strength of the interface, the interface will eventually be completely debonded, and a limit state where the load is completely borne by the fibers app...
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
| Property | Measurement | Unit |
|---|---|---|
| length | aaaaa | aaaaa |
| length | aaaaa | aaaaa |
Login to View More
Abstract
The invention discloses a rapid prediction method for a fatigue limit of a ceramic-based composite material. the cracking of a matrix is considered in the fatigue process; Interface debonding and slippage, the influence of factors such as interface abrasion and fiber breakage is avoided; According to the method, the fatigue limit state of the composite material is established, a model capable of calculating the fiber monofilament broken end probability is provided in consideration of possible broken ends of fiber monofilaments in the composite material, and the accuracy of calculating the fatigue limit load is improved, so that the fatigue limit load of the ceramic matrix composite material can be quickly calculated. Most parameters required by the fatigue limit load calculated in the invention can be obtained through experiments, and the fatigue limit load of the material can be quickly obtained by using the method provided by the invention. The fatigue limit load represents the maximum load which can be borne by the material on the premise that the material is never tired, and can be used for judging whether the working environment of the material is proper or not.
Description
technical field [0001] The invention belongs to the field of ceramic matrix composite materials, and in particular relates to a method for rapidly predicting the fatigue limit of ceramic matrix composite materials, in particular to a method capable of quickly and effectively predicting the fatigue limit of small composite materials. Background technique [0002] With the development of science and technology, ceramic matrix composites have the advantages of high specific strength, high specific stiffness, high temperature resistance and low density, and have broad application prospects in components such as aero-engine combustion chambers and tail nozzle regulators. Composite components are often damaged or even destroyed due to stress and environmental factors during use, and fatigue damage is one of the main forms of failure. The occurrence, expansion and accumulation of fatigue damage will aggravate the environment and stress corrosion of the material, accelerate the agin...
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): G06F17/50
Inventor 高希光段浩宋迎东张盛于国强
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS