Prediction Method of Stress-Strain Behavior of Unidirectional Ceramic Matrix Composites under Arbitrary Loading and Unloading

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: 2018-04-13
南京长工智航科技有限公司
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Problems solved by technology

However, due to the existence of a large number of numerical calculations, the calculation takes a long time, this is not an efficient method

Method used

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  • Prediction Method of Stress-Strain Behavior of Unidirectional Ceramic Matrix Composites under Arbitrary Loading and Unloading
  • Prediction Method of Stress-Strain Behavior of Unidirectional Ceramic Matrix Composites under Arbitrary Loading and Unloading
  • Prediction Method of Stress-Strain Behavior of Unidirectional Ceramic Matrix Composites under Arbitrary Loading and Unloading

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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...

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Abstract

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. The purpose of the present invention is to overcome the defects of the prior art and provide a method for quickly predicting the stress-strain behavior of the unidirectional ceramic matrix composite material during random loading and unloading. The invention provides a method for predicting the stress-strain behavior of a unidirectional ceramic matrix composite material under arbitrary loading and unloading, which considers failure mechanisms such as matrix cracking, fiber breakage, interface slippage, and interface wear. The generation and coverage rules of forward and reverse slip zones are proposed, and the stress distribution and strain when there are any number of forward and reverse slip zones are given. Most of the formulas provided by the invention have analytical solutions, so the stress-strain behavior of the unidirectional ceramic matrix composite material under arbitrary loading and unloading can be quickly predicted.

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

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Application Information

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Patent Type & Authority Patents(China)
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
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