Ultrasonic wave assisted stretching device and method

A technology of auxiliary stretching and stretching devices, applied in measuring devices, using stable tension/pressure to test the strength of materials, instruments, etc., can solve problems such as difficult to simulate service environments

Inactive Publication Date: 2018-10-02
DONGGUAN UNIV OF TECH +1
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  • Abstract
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  • Application Information

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Problems solved by technology

In previous tests, unidirectional tensile vibration tests were carried out on materials, but sometimes when the workpiece is in service, the stress environment is not single, so it is difficult for unidirectional tensile tests to simulate the harsher service environment

Method used

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  • Ultrasonic wave assisted stretching device and method

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specific Embodiment approach

[0023] Generally, the discussion of the constitutive relation of materials refers to the distortion properties of the material, so the discussion of the constitutive relation involves the equivalent shear stress and equivalent shear strain, that is, the deviating part of the stress and strain tensor, The research on the spherical part of the stress and strain tensor belongs to the research scope of the equation of state; at the same time, the tensile test is one of the most commonly used methods to study various mechanical parameters of materials. Under the constitutive relationship and the changes of various mechanical performance parameters compared with normal tension, this application applies ultrasonic vibration to the workpiece 5, and carries out ultrasonic-assisted stretching tests to obtain the mechanical characteristics of the material. This application The tensile test is mainly carried out on No. 2219 aluminum alloy or No. 20 steel. No. 2219 aluminum alloy is often u...

Embodiment 1

[0026] Example 1. Ultrasonic-assisted tensile test on No. 2219 aluminum alloy

[0027] Step 1. Prepare ultrasonic generator 1: According to the material to be tested and the environmental parameters of the material to be used, select an ultrasonic source with a power supply voltage of 220V, a frequency of 50Hz, a maximum output power of 3000W, and an adjustable frequency range of 20KHz to 40KHz.

[0028] Ultrasonic generator 1, also known as ultrasonic frequency generator, is an energy source for supplying ultrasonic electric energy to ultrasonic transducer 4. Its function is to convert alternating current into ultrasonic frequency electric power output to provide the energy required for workpiece 5 to vibrate when stretched by ultrasonic vibration. . It is mainly composed of oscillators, voltage amplifiers, power amplifiers and output transformers. Among them, the oscillator is the heart of the ultrasonic generator 1 . In order to ensure the frequency stability of the ultra...

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Abstract

The invention relates to material stretching tests, and especially relates to an ultrasonic wave assisted stretching device and method. According to the method, ultrasonic waves are used to carry outfatigue stretching on hard metals. The whole stretching device is arranged along the vertical direction and mainly comprises two ultrasonic wave generators with same parameters and two connection rodstretching structures with a same structure. The connection rod stretching structures are both provided with an amplitude-change pole. One end of each amplitude-change pole is provided with workpieceand the other end is electrically connected to one ultrasonic wave generator through a transducer so that the ultrasonic wave generators can transmit the electric energy of ultrasonic waves to the transducers. The provided ultrasonic stretching system can simulate a severe work environment and is capable of stretching workpiece from one direction or two directions. Through data analysis, the expanding mechanism of cracks of on-service workpiece under an ultrasonic vibration unidirectional / bidirectional stretch load can be obtained.

Description

technical field [0001] The invention relates to the research of material stretching experiments, in particular to an ultrasonic-assisted stretching device and method for fatigue stretching of hard metals using ultrasonic waves. Background technique [0002] Both aluminum alloy and steel are important industrial materials, especially widely used in the aerospace industry. Aluminum alloy is used to make surface skins, load-bearing structures and connecting fasteners of aircraft and rockets. The loads on modern mechanical structures The environmental and environmental conditions are very harsh, but the requirements for the reliability and safety of the structure are getting higher and higher, and the fatigue life required for safe service is also getting longer and longer. In addition, due to the vibration of aerodynamics and mechanical operation, the structure is often threatened by acoustic fatigue or ultrasonic fatigue. The alternating stress generated by this vibration will...

Claims

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Application Information

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IPC IPC(8): G01N3/06G01N3/08
CPCG01N3/06G01N3/08
Inventor 陈海彬孙振忠邓世春尚欣
Owner DONGGUAN UNIV OF TECH
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