Testing device and method for the mechanical properties of inner yarn of ceramic matrix composite material

Abstract

The invention provides a testing device for the mechanical properties of an inner yarn of a ceramic matrix composite material. The device comprises test machine chunks, an upper round bar, a force sensor, U-shaped clamp blocks, pins, reinforcing pieces, a fibre bundle with a base body, a lower round bar and an extensometer. There are two test machine chunks respectively clamp the upper round bar and the lower round bar; the upper round bar is connected with the U-shaped clamp blocks through the force sensor, and the lower round bar is connected with the U-shaped clamp blocks; there are two U-shaped clamp blocks which are connected with the reinforcing pieces through the pins; there are two reinforcing pieces respectively connected with the two ends of the fibre bundle with a base body; theforce sensor and the extensometer are connected with a data collection system through data lines. The testing method based on the device comprises the steps of: preparing the fibre bundle with the base body, fixedly installing the fibre bundle with the base body on the testing device, the pull-up test is performed on the test machine, and the force sensor and the extensometer are employed to measure and obtain the mechanical properties such as elastic modulus and strength of the fiber bundle with the base body.

Description

technical field [0001] The invention belongs to the field of mechanical testing of composite materials, and in particular relates to a testing device and a testing method for the mechanical properties of internal yarns of ceramic matrix composite materials. Background technique [0002] Ceramic matrix composites (Ceramic Matrix Composite: hereinafter referred to as CMCs) have the advantages of high temperature resistance, high specific strength, high specific modulus, insensitivity to notches, and strong designability of material properties. They are ideal materials for high-temperature components of the next generation of aero-engines. . When CMCs are loaded, the inner yarn is the main load-bearing element, so the mechanical properties of yarns have an important influence on the mechanical properties of CMCs. In addition, in the mesomechanics method, domestic and foreign scholars often regard CMCs as yarn-reinforced composite materials, and use the mechanical behavior of y...

AI Technical Summary

Problems solved by technology

At present, there is no reliable method to measure the mechanical properties of the yarn inside CMCs, and there is no published invention patent

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