Method for predicating stress-strain behavior under arbitrary loading and unloading of one-way ceramic matrix composite

A composite material, stress-strain technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as long calculation time

Active Publication Date: 2015-08-26
南京长工智航科技有限公司
View PDF5 Cites 24 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the existence of a large number of numerical calculati

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 more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for predicating stress-strain behavior under arbitrary loading and unloading of one-way ceramic matrix composite
  • Method for predicating stress-strain behavior under arbitrary loading and unloading of one-way ceramic matrix composite
  • Method for predicating stress-strain behavior under arbitrary loading and unloading of one-way ceramic matrix composite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0055] The invention discloses a method for predicting the stress-strain behavior of a unidirectional ceramic matrix composite material in any loading and unloading process. The specific steps of the method are as follows:

[0056] 1) Determine whether the material has matrix cracks. If no matrix cracks occur, calculate the strain according to the mixing ratio formula. Otherwise, perform step 2). The material after matrix cracks represents a voxel, such as figure 1 shown;

[0057] 2) Determine the number of slip zones;

[0058] 3) Calculate the current interface shear stress τ based on the load history i ;

[0059] 4) Calculate the current fiber fracture rate D based on the Weibull failure distribution, and calculate the new fiber volume fraction v f ;

[0060] 5) Calculate the matrix crack spacing L based on the critical matrix strain energy criterion;

[0061] 6) Calculate the length of the new slip zone;

[0062] 7) Judging whether the slip zone coverage occurs, if th...

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

No PUM Login to view more

Abstract

The invention relates to a method for predicating a stress-strain behavior of a composite, in particular to a method for predicating the stress-strain behavior under arbitrary loading and unloading of a one-way ceramic matrix composite. The invention aims at overcoming the defects of the prior art to provide the method capable of quickly predicating the stress-strain behavior under arbitrary loading and unloading of the one-way ceramic matrix composite. The invention provides the method for predicating the stress-strain behavior under arbitrary loading and unloading of the one-way ceramic matrix composite, and considers failure mechanisms, such as matrix cracking, fiber breakage, interface slip and interface abrasion. Generation and coverage rules for forward and reverse slip regions are provided, and the stress distribution and the strain are given in the presence of any number of forward and reverse slip regions. Most of formulas given by the method have analytical solutions, so that the stress-strain behavior under arbitrary loading and unloading of the one-way ceramic matrix composite can be quickly predicated.

Description

technical field [0001] The invention relates to a method for predicting the stress-strain behavior of a composite material, in particular to a method for predicting the stress-strain behavior of a unidirectional ceramic matrix composite material under arbitrary loading and unloading. Background technique [0002] 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. When the aero-engine is working, the combustor and the tail nozzle regulating plate will be randomly excited to generate random vibration and fatigue due to the unstable combustion and high-speed airflow. Under random excitation, the material is subjected to irregular variable amplitude cyclic loads. The stress-strain behavior of materials under arbitrary loading and unloading (ie variable amplitude cyclic l...

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
no application Login to view more
IPC IPC(8): G06F17/50
Inventor 宋迎东张盛高希光方光武
Owner 南京长工智航科技有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap