Apparatus and method for testing mechanical properties of fiber-reinforced composite materials during degradation

Abstract

A device and method for testing mechanical properties of a fiber reinforced composite material during degradation, relating to the technical field of test apparatuses. The device comprises a moving gearshift vibration exciter (1), a continuously variable transmission (2), a fixture (3), a fixing frame (4), a support base (5), a bottom plate (6), a ball screw (7), and a transmission system (8), a multifunctional environmental cabinet (9), a ventilation means (10), a damping fixing plug (11), a screw transmission plate (12), a main motor (13), an auxiliary motor (14), a vibration pin means (15), and a composite beam (16). The device can stretch and vibrate the fiber reinforced composite beam (16) and introduce an environmental factor, which include five factors in all, i.e., vibration, temperature, humidity, air oxygen content, and ultraviolet intensity. A single load or environmental factor can be loaded, and the above several factors can also be arbitrarily composited. Then the compositing is performed by an environmental factor maintenance mechanism adjusted according to requirements and by means of stretching and vibration. Moreover, the thermal environment provided by the multifunctional environmental cabinet (9) has a temperature gradient.

Description

technical field [0001] The invention relates to the technical field of testing equipment, in particular to a device and method for testing the mechanical properties of fiber-reinforced composite materials when degraded, and a device capable of measuring the mechanical properties of fiber-reinforced composite materials when degraded. Background technique [0002] Fiber-reinforced composite materials have high specific strength, high specific modulus, good thermal stability, and certain damping and vibration reduction capabilities, so they are widely used in important fields such as aviation, aerospace, ships, and weapon industries. At present, there are a large number of various composite structural parts made of this type of material in engineering practice, such as composite wings used in helicopters and jet aircraft, high-temperature turbine blades made of fiber / ceramic matrix composites in aero-engines, etc. . Because composite materials and structures are often in a the...

AI Technical Summary

Problems solved by technology

However, its own structural problems are also very prominent, especially under the influence of excitation and external environment, it will degrade and lead to the decline of the mechanical properties of the material. The size of its influence is particularly important

[0007] For a long time, the research work on the degradation of fiber reinforced composite materials has been very limited. The main reason is that the excitation method is difficult to solve

In addition, the previous test benches were not comprehensive enough for the environmental factors of fiber reinforced composites and could not effectively combine vibration factors, environmental factors and mechanical tests into a mechanism

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