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Strain control method for measuring residual strength and residual service life of composite material

A strain control, composite material technology, applied in analysis materials, measurement devices, special data processing applications, etc., can solve problems such as difficult model determination

Inactive Publication Date: 2014-09-03
BEIHANG UNIV
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Problems solved by technology

[0002] The method of determining the residual strength and remaining life of composite materials is an important prerequisite for the evaluation of its fatigue life. Due to the complexity of fatigue damage of composite materials, it is difficult to define the damage of composite materials in a single way. Therefore, various methods based on stiffness drop and crack density have been proposed successively. , crack length and other concepts of fatigue damage models; however, these models are difficult to measure conveniently by test methods, for this reason, the present invention proposes a strain control method for measuring the remaining strength and remaining life of composite materials, which is simple, practical and easy to operate , high calculation accuracy, can fully and reasonably characterize the physical characteristics of fatigue damage of composite materials and the law of phenomenological test data, which has important academic significance and engineering application value

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  • Strain control method for measuring residual strength and residual service life of composite material

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Embodiment Construction

[0066] figure 1 It is the block flow chart of method for the present invention, and the present invention is divided into three major steps and realizes, specifically:

[0067] Step 1. Strain-controlled residual strength model

[0068] Fatigue damage leads to a decrease in strength, and the effective modulus drop of the composite material over time can be expressed as

[0069] dR ( n ) dn = - f ( r , s , ω ) R b - 1 ( n ) - - - ( ...

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Abstract

The invention relates to a strain control method for measuring residual strength and residual service life of a composite material. The strain control method comprises three steps of (1) a strain control residual strength model; (2) a random model of the strain control residual strength; and (3) model parameter estimation. The strain control method is simple and practical, is convenient for operations and has high calculation precision. The strain control method has relatively good practical value and wide application prospects in the field of measurement technology.

Description

technical field [0001] The invention provides a strain control method for measuring the remaining strength and remaining life of a composite material, belonging to the technical field of testing and testing. Background technique [0002] The method of determining the residual strength and remaining life of composite materials is an important prerequisite for the evaluation of its fatigue life. Due to the complexity of fatigue damage of composite materials, it is difficult to define the damage of composite materials in a single way. Therefore, various methods based on stiffness drop and crack density have been proposed successively. , crack length and other concepts of fatigue damage models; however, these models are difficult to measure conveniently by test methods, for this reason, the present invention proposes a strain control method for measuring the remaining strength and remaining life of composite materials, which is simple, practical and easy to operate , High calcul...

Claims

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Application Information

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IPC IPC(8): G01N33/00G06F17/50
Inventor 熊峻江白江波黄雪聪
Owner BEIHANG UNIV
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