Composite material structure static strength and fatigue strength integrated test verification method

Abstract

The invention discloses a composite material structure static strength and fatigue strength integrated test verification method. According to the method aiming at material characteristics and structure of a composite material, the requirements that cyclic load needs to be considered in composite material static strength verification, residual bearing capacity needs to be considered after the cyclic load, and residual strength evaluation needs to be carried out after fatigue verification are met, actual experience is combined, the method for verifying the static and fatigue test of the composite material structural component on the same test piece is provided, the technical bottleneck of verification of the composite material structural component is solved, a structural static strength andfatigue strength integrated verification chain of a composite material structural component 'limited load static-fatigue-limit load static-fatigue (damage tolerance)-limited (limit) load static force'is formed, so that the composite material structural component is fully verified, the development period can be shortened, the number of test pieces is reduced, the cost is reduced, and the flight safety level of an aircraft is further improved.

Description

technical field [0001] The invention of the method belongs to the field of aviation science and technology, and relates to an integrated test verification method of static strength and fatigue strength of a composite material structure. Background technique [0002] Composite materials have the advantages of light weight, good fatigue resistance, corrosion resistance, easy large-area integral molding, high specific strength / specific stiffness, etc., and are increasingly widely used in the aerospace field. In order to ensure the same high safety level as that of metal structures, countries such as Europe and the United States have invested a lot of money in research on the verification of composite material structures, which started early and accumulated a lot of experience and data. [0003] The application of composite material structures in my country's aviation field is relatively late, especially in load-bearing structures. Composite material structure verification invo...

AI Technical Summary

Problems solved by technology

Composite material structure verification involves static strength analysis, fatigue analysis, damage tolerance analysis and other fields. The composite material structure in the aviation field in the early stage is based on the test verification method of metal structure, and the static force and fatigue tests are carried out on different test pieces. The verification did not consider that the defect is the "inherent property" of the composite material, and prefabricated the defect of the test piece, and did not consider the static strength notch sensitivity of the composite material, the fatigue notch sensitivity characteristics, and the large performance change of the composite material due to environmental influence and time aging. The characteristics are tested and verified, and the requirements of the airworthiness regulations that "the static strength verification of composite materials must consider the cyclic load and the remaining bearing capacity after the cyclic load" are not considered during the test verification, so the composite material structure has not been fully verified. The reliability and safety of composite structures cannot be well guaranteed

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