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Bending microstress detection method of fiber-reinforced composite material performance degradation

A composite material and fiber-reinforced technology, applied in the direction of applying stable bending force to test material strength, analyze material, strength characteristics, etc., can solve the problem of varying severity of defect damage, limited role of response analysis and life prediction, defect characteristics Problems such as size dispersion, to achieve the effect of rapid prediction and evaluation

Pending Publication Date: 2019-12-20
HANGZHOU JIANTU TECH
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Problems solved by technology

However, due to the variety of internal defects in the composite material structure, the characteristic size of the defects is dispersed, and the severity of the defect damage is different, tracking the specific position, shape and size of a single defect has a very limited effect on the overall behavioral response analysis and life prediction of the composite material structure.

Method used

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  • Bending microstress detection method of fiber-reinforced composite material performance degradation
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  • Bending microstress detection method of fiber-reinforced composite material performance degradation

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Embodiment

[0035] When the macroscopic elastic properties of the main fiber direction are reduced, the structure will exhibit an unconventional special response mode under a specific load. Taking composite laminates as an example, such as figure 1 As shown, this particular load is a bending load M y0 .

[0036] When the strength of the laminate is damaged along the main direction of the fiber, a bending load is applied to the laminate M y0 , the laminate along y The in-plane displacement in the axial direction will produce corrugations, and the denser the corrugations, the larger the corrugation amplitude, indicating that the strength along the main direction of the fiber is more damaged. For comparison, figure 2 gives a comparison, figure 2 middle z The values ​​are the standard deviations of the elastic constants relative to the main fiber directions from their mean. z =0 means ideal material without any performance degradation. z The larger the value, the more serious the...

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Abstract

The present invention discloses a bending microstress detection method of fiber-reinforced composite material performance degradation. The method comprises the following steps: 1) placing a to-be-detected composite material test piece on a bending testing apparatus, and applying a tiny bending load, to cause stress and elastic deformation of the composite material test piece without destruction, wherein the composite material test piece can return to an original state after the bending load is removed, and the bending load comprises a uniform bending load and a centralized bending load; and 2) detecting, under the bending load, whether there is corrugation in in-plane displacement of the composite material test piece, and associating random normal distribution model parameter values Zetaaccording to an amplitude and a density of the corrugation, to obtain mechanical property distribution statistics information of the composite material test piece along a fiber principal direction. The method can be used for fast providing effective predictive evaluation on structure performance and a service behavior.

Description

technical field [0001] The invention relates to a method for detecting performance degradation of fiber-reinforced composite materials. Background technique [0002] The structure of fiber reinforced composite material has significant advantages such as high specific strength, large specific modulus, corrosion resistance, and not easy to generate debris when damaged, so it is widely used in aerospace, automobile ships, construction engineering, high-end sports equipment and other fields, and its structural performance is good. , Light in weight, can improve the anti-seismic performance while reducing its own weight, and will replace traditional metal industrial materials such as steel more widely in the future, and has broad development prospects. [0003] The processing technology of fiber-reinforced composite materials is relatively complicated. During the processing, due to changes in environmental temperature, humidity, fiber prestress, formula, curing temperature and ot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/20G01N3/06
CPCG01N3/068G01N3/20G01N2203/0003G01N2203/0023G01N2203/0075G01N2203/0641G01N2203/0682
Inventor 马利韩九林
Owner HANGZHOU JIANTU TECH
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