GB/T 43938.3-2026Test method for the mechanical properties of thin-walled carbon fibre reinforced composite tubes - Part 3: Cantilever beam bending test (English PDF)

1 Scope

This document specifies the test principle, specimens, test conditions, and equipment for the cantilever beam bending test of carbon fiber reinforced composite thin-walled tubular components.

Preparation, test procedures, data processing, and test reports.

This document applies to cantilever beam bending of carbon fiber reinforced composite thin-walled tubular components with a wall thickness not exceeding 1 mm and a nominal outer diameter less than 50 mm.

Curved test.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.

For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.

This document.

GB/T 1446 General Rules for Test Methods of Properties of Fiber Reinforced Plastics

GB/T 7124 Determination of tensile shear strength of adhesives (rigid material to rigid material)

3 Terms and Definitions

This document does not contain any terms or definitions that need to be defined.

4 Experimental Principle

As shown in Figure 1, one end of the carbon fiber reinforced composite thin-walled tube sample is fixedly installed, and the sample is mounted on the upper surface, lower surface, or other surfaces where necessary.

Strain measurement points were placed at the target location, and deflection measurement points were placed on the upper surface. At the other end, a load perpendicular to the initial axis of the specimen was applied in stages.

The load is applied in the same direction until the test load value is reached or the specimen fails or becomes unstable, and during the loading process...

Record the strain, deflection, and applied load values of the specimen to obtain performance parameters such as deflection, bending stiffness, and bending load capacity of the specimen.