Method for estimating fatigue life of carbon fiber sewn composite material based on rigidity degradation

A technology for composite materials and fatigue life, applied in design optimization/simulation, instruments, calculations, etc., can solve the problems of insufficient quantitative research on the damage of stitched composite materials, and the inability to link the fatigue characteristics of stitched composite materials with fatigue life, etc., to achieve The prediction method is simple, fast, and the effect of high accuracy

Active Publication Date: 2021-10-19
SHANGHAI UNIV OF ENG SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to solve the problem that the quantitative research on the damage of stitched composite materials is not deep enough in the prior art, and the fatigue characteristics of the stitched composite materials cannot be linked with the fatigue life, and to provide a fatigue life prediction method based on stiffness degradation of carbon fiber stitched composite materials. estimation method

Method used

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  • Method for estimating fatigue life of carbon fiber sewn composite material based on rigidity degradation
  • Method for estimating fatigue life of carbon fiber sewn composite material based on rigidity degradation
  • Method for estimating fatigue life of carbon fiber sewn composite material based on rigidity degradation

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Embodiment 1

[0036] A fatigue life prediction method for carbon fiber stitched composites based on stiffness degradation, the specific steps are as follows:

[0037] (1) Preparation of materials:

[0038] Carbon fiber unstitched composite material: T300 carbon fiber laminate;

[0039] Carbon fiber stitching composite material: T300 carbon fiber laminates are stitched with improved lock stitching. The nominal thickness of the carbon fiber stitching composite material obtained by stitching is 2mm, the line spacing is 5mm, and the needle pitch is 3mm. The stitching lines are all Kevlar, and the fineness 167dtex;

[0040] (2) Tensile strength test of carbon fiber unstitched composite materials and carbon fiber stitched composite materials;

[0041] The test data of tensile strength of carbon fiber unstitched composites and carbon fiber stitched composites are as follows: figure 1 As shown, the ultimate static tensile stress σ of the carbon fiber unstitched composite is calculated uts (550M...

Embodiment 2

[0061] A fatigue life prediction method for carbon fiber stitched composites based on stiffness degradation, the specific steps are as follows:

[0062] (1) Preparation of materials:

[0063] Carbon fiber unstitched composite material: T300 carbon fiber laminate;

[0064] Carbon fiber stitching composite material: T300 carbon fiber laminates are stitched with improved lock stitching. The nominal thickness of the carbon fiber stitching composite material obtained by stitching is 2mm, the line spacing is 5mm, and the needle pitch is 3mm. The stitching lines are all Kevlar, and the fineness 167dtex;

[0065] (2) Tensile strength test of carbon fiber unstitched composite materials and carbon fiber stitched composite materials;

[0066] The test data of tensile strength of carbon fiber unstitched composites and carbon fiber stitched composites are as follows: figure 1 As shown, the ultimate static tensile stress σ of the carbon fiber unstitched composite is calculated uts (550M...

Embodiment 3

[0086] A fatigue life prediction method for carbon fiber stitched composites based on stiffness degradation, the specific steps are as follows:

[0087] (1) Preparation of materials:

[0088] Carbon fiber unstitched composite material: T300 carbon fiber laminate;

[0089] Carbon fiber stitching composite material: T300 carbon fiber laminates are stitched with improved lock stitching. The nominal thickness of the carbon fiber stitching composite material obtained by stitching is 2mm, the line spacing is 5mm, and the needle pitch is 3mm. The stitching lines are all Kevlar, and the fineness 167dtex;

[0090] (2) Tensile strength test of carbon fiber unstitched composite materials and carbon fiber stitched composite materials;

[0091] The test data of tensile strength of carbon fiber unstitched composites and carbon fiber stitched composites are as follows: figure 1 As shown, the ultimate static tensile stress σ of the carbon fiber unstitched composite is calculated uts (550M...

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Abstract

The invention relates to a method for estimating the fatigue life of a carbon fiber stitched composite material based on rigidity degradation, which comprises the following steps of: firstly, respectively carrying out tensile strength test on a carbon fiber unstitched composite material and a carbon fiber stitched composite material, and simultaneously carrying out fatigue tensile strength test on the carbon fiber unstitched composite material to obtain test data; and substituting the test data into a calculation formula of the fatigue life of the carbon fiber sewed composite material to obtain the fatigue life of the carbon fiber sewed composite material. The calculation formula of the fatigue life of the carbon fiber stitched composite material is as follows: in the formula, Nf is the fatigue life of the carbon fiber stitched composite material; n is the cycle index of the carbon fiber unstitched composite material; Q(n) is the fatigue stiffness of the carbon fiber unstitched composite material in the nth cycle; Q0 is the fatigue stiffness of the carbon fiber unstitched composite material during initial circulation; r is the cyclic stress level; H and c are tolerance parameters; and k is a suture enhancement coefficient. The invention provides a new method for predicting the fatigue life of the stitched composite material.

Description

technical field [0001] The invention belongs to the technical field of composite material testing, and relates to a method for estimating the fatigue life of a carbon fiber stitched composite material based on stiffness degradation. Background technique [0002] Fatigue damage is one of the least favored categories of failure encountered in modern engineered components. For composite materials, it is very important to correctly characterize the fatigue damage process and establish a reliable fatigue life prediction method. In the current study of fatigue damage mechanisms of composite materials, the fatigue damage of these composite materials has been characterized using both destructive and non-destructive techniques. The existing fatigue damage mechanism shows that the fatigue damage of carbon fiber composites is a damage process of interaction among various damage mechanisms such as delamination, fiber fracture, matrix cracking, and fiber matrix peeling. The damage vari...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06F113/26G06F119/04
CPCG06F30/20G06F2113/26G06F2119/04
Inventor 刘新田张晓莹王舒茨
Owner SHANGHAI UNIV OF ENG SCI
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