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

Abstract

The invention belongs to the technical field of composite material structure fatigue testing and discloses a composite material dynamic fatigue testing device and method based on reverse resonance. The testing device includes a double cantilever beam vibration testing system, an electronic acquisition system and a measurement and control system; An eccentric motor is used to drive the beam to be tested to vibrate. Compared with the exciter, which is small in size, consumes less energy, and is easy to carry, the present invention uses the reverse resonance of the double cantilever vibrating beam to drive the beam to be tested to vibrate, which improves testing efficiency and saves money. Energy is saved, and compared with existing testing equipment, the amplitude range of the beam to be tested is broadened. The present invention accurately controls the eccentric motor and uses a variety of precision instruments to measure the fatigue characteristics of the material to be tested from optical, acoustic, and time domains. Waveforms and other aspects have been measured and analyzed, and have extremely high test accuracy. The equipment of the invention is simple, and most of the components adopt a detachable design, which is easy to disassemble, has good portability and 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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