A device and method for dynamic fatigue testing of composite materials based on reverse resonance

Abstract

Provided are a composite material dynamic fatigue testing device and a method based on reverse resonance, wherein the testing device comprises a double-cantilever-beam vibration testing system, an electronic acquisition system, and a measurement and control system; the device uses an eccentric motor (3) to drive a beam to be tested (12) to vibrate, compared with a vibration exciter, the device has a small size and less energy consumption, and is convenient to carry, the device uses a double-cantilever vibration beam (2) to drive the beam to be tested (12) to vibrate through inverse resonance, the test efficiency is improved and energy is saved, compared with the prior testing device, the device broadens an amplitude range of the beam to be tested (12). The method precisely controls the eccentric motor (3), uses a variety of precision instruments to measure and analyze the fatigue features of the material to be tested from optics, acoustics, time domain waveform, etc., and has extremely high test accuracy. The device is simple, most of components are detachable, dismounting is convenient, portability is good and the device is easy to operate.

Description

technical field [0001] The invention belongs to the technical field of composite material structure fatigue testing, and in particular relates to a composite material dynamic fatigue testing device and method based on reverse resonance. Background technique [0002] With the deepening of research, fiber-reinforced composite materials have high specific strength, high specific modulus, good thermal stability, and certain damping and vibration reduction capabilities. Many superior properties are known. They are not only widely used in aviation Aerospace and other high-tech fields can also be used in stationery, textile machinery, medical equipment, biological engineering, building materials, chemical machinery, transportation vehicles, etc. However, composite components are often damaged or even destroyed due to stress and environmental factors during use, and fatigue damage is one of the main forms of failure. The occurrence, expansion and accumulation of fatigue damage will...

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Problems solved by technology

Patent CN 107966354 A uses laminated unidirectional plates to measure the fatigue of composite materials, and provides a fatigue life prediction method, device and electronic equipment for composite materials, but it relies too much on the support of existing databases, and the fatigue performance of new composite materials Insufficient research capacity

The electro-hydraulic servo method can achieve large load loading, but the work efficiency is low

Electromagnetic resonance method, the use of electronic control technology can achieve the purpose of energy saving, but the amplitude is small, and it is not easy to control

[0004] With the widespread use of fiber-reinforced composite materials, although the traditional universal material testing machine can evaluate the material to a certain extent, such as separate static loads such as tension, compression, and torsion can be applied to the material, and this evaluation The influence of force on fatigue characteristics, the test frequency is very low (about 3~10Hz) and dynamic fatigue test cannot be carried out

The universal material testing machine has great limitations and is not suitable for the measurement and evaluation of the fatigue properties of fiber-reinforced composite materials at this stage

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