Device and method for reckoning fatigue crack propagation rate of flat alloy by AC potentiometry

A technology of fatigue crack growth and potential method, which is applied in the field of material fatigue performance testing, can solve the problems of non-destructive testing and damage to the integrity of the sample, and achieve the effect of improving conductivity, improving precision, and being convenient for multiple use

Inactive Publication Date: 2010-09-15
JIANGSU UNIV
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Problems solved by technology

This method is similar to the measurement principle of the alternating current potential method, the difference is that the applied current is direct current, this method can measure the fatigue crack length, and the degree of automation is improved. The integrity of the sample is destroyed, making it difficult to achieve non-destructive testing

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  • Device and method for reckoning fatigue crack propagation rate of flat alloy by AC potentiometry
  • Device and method for reckoning fatigue crack propagation rate of flat alloy by AC potentiometry
  • Device and method for reckoning fatigue crack propagation rate of flat alloy by AC potentiometry

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Embodiment Construction

[0034] The details and working conditions of the specific device proposed by the present invention will be described in detail below in conjunction with the accompanying drawings.

[0035] The device for measuring and calculating the fatigue crack growth rate of flat alloys by using the AC potential method of the present invention includes a fatigue testing machine (1), a sample clamp (2) and a flat sample (3) between them, and an AC potential sensor on the sample. (4), prefabricated surface crack (5), potential measurement probe (6), lead wire (7), signal amplifier (8), dual trace oscilloscope (9), A / D converter (10), CCD image acquisition system (12) and the computer (11) that installs supporting software control program.

[0036] figure 1 Schematic diagram of the closed control system for measuring and calculating the fatigue crack growth rate of flat alloy by AC potential method. First, the sensor (4) based on the principle of AC potential method is installed on the samp...

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Abstract

The invention provides a device and a method for reckoning the fatigue crack propagation rate of a flat alloy by AC potentiometry, relating to the field of detecting material fatigue performance. The method comprises the following steps: in the process of a tension-tension fatigue test, two pairs of probes are arranged on the surface of a flat alloy sample, and the sample monitors electric potential change at the two sides of a crack in real time by an AC potentiometry sensor thereon when the fatigue crack propagates; the electric potential change is transmitted to a dual-trace oscilloscope by an amplifier; the dual-trace oscilloscope displays the electric potential oscillogram of the propagation of the two ends of the crack; and the electric potential oscillogram is input to a computer by an A/D converter, and is analyzed by a bundled software to obtain fatigue propagation rate such as the fatigue crack propagation rate and the like. The device of the invention mainly comprises a fatigue-testing machine, sample fixtures, the AC potentiometry sensor, potential measurement probes, lead wires, a signal amplifier, the dual-trace oscilloscope, the A/D converter, a CCD image acquisition system and the computer. The invention is applicable to research on the fatigue crack propagation behavior of the alloy.

Description

technical field [0001] The invention relates to the field of material fatigue performance detection, in particular to a method and device for measuring and calculating the fatigue crack growth rate of flat alloys by an alternating current potential method, and is mainly applicable to the research on the fatigue crack growth behavior of alloys. Background technique [0002] The fatigue crack growth resistance of materials has become an important parameter in the design of real components. In order to ensure the safe use of components, it is necessary to study the fatigue and crack growth behavior of materials. The potential method can be used to derive the functional formula between the potential difference and the crack length during fatigue crack growth. Therefore, the potential difference can be used as a function of the crack position and size parameters to calculate the fatigue crack growth rate. The potential monitoring method is divided into direct current potential me...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/87
Inventor 张磊张永康鲁金忠姜银方张朝阳钱晓明管海兵李志飞方雷唐振洲
Owner JIANGSU UNIV
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