Method for predicting transverse tensile strength of coreless brittle fibers

Abstract

The invention provides a method for predicting the transverse tensile strength of coreless brittle fibers. The method comprises the following steps of: step 1, preparing a fiber sample; 2, carrying out a fiber compression test by using a nanoindentor to obtain fracture load data; and 3, calculating a load contact angle according to the fracture load, establishing a fiber compression model, and substituting the fracture load and the load contact angle into the fiber compression model to calculate the stress of the vertical radial surface of a fiber, the stress at the circle center of the vertical radial surface of the fiber being the maximum transverse tensile strength of the fiber sample. The method is high in calculation precision; the influence of the size of a compression contact surface on the internal stress distribution of the fiber is considered; the comparison conformity of a calculation result and a finite element analysis result is high. The calculation process of the methodis efficient and convenient; the transverse tensile strength of the fiber can be calculated only by modifying the contact surface angle and the fracture load, and a series of complex operations such as establishing a model by a finite element method, dividing a load area with a certain angle on a curved surface, applying a constraint load and dividing grids are avoided.

Description

Technical field [0001] The invention relates to a method for predicting the transverse tensile strength of coreless brittle fibers, in particular to a method for predicting the transverse tensile strength of coreless brittle fibers by using a nanoindenter to perform a fiber compression test. Background technique [0002] Fiber-reinforced composite materials have the advantages of (1) high specific strength and large specific modulus (2) designability of material properties (3) good corrosion resistance and durability (4) small thermal expansion coefficient, etc., and are used in aerospace, automotive, Sports and other industries are widely used. Brittle fibers such as silicon carbide fibers, carbon fibers, and boron fibers have the advantages of high hardness and high specific modulus, and are widely used in the reinforcement phase of composite materials. [0003] When the composite material is laterally compressed, because the lateral stiffness of the fiber is usually greater tha...

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Problems solved by technology

[0005] In the prior art, Jeffrey I. Eldridge proposed a method for testing the transverse tensile strength of a cored fiber, which did not consider the influence of the local pressure on the load conta...

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