Acoustic test platform capable of characterizing metal meso-damage change and test method

Abstract

The present invention relates to an acoustic test platform capable of characterizing metal meso-damage change and a test method. The acoustic test platform comprises a micro-force in-situ tensile testloading mechanism, a meso-damage visualized observation mechanism and a faint acoustic signal detection mechanism. The micro-force in-situ tensile test loading mechanism consists of a micro-force in-situ tensile machine arranged on an in-situ tensile test platform and an acoustic signal data acquisition system connected with the micro-force in-situ tensile machine. The meso-damage observation mechanism consists of a high-resolution microscope and a high-definition digital camera, wherein the high-resolution microscope are connected with the high-definition digital camera, and the high-resolution microscope and the high-definition digital camera are arranged on the microscope supporting platform. The faint acoustic signal detection mechanism comprises an acoustic emission tester, a pre-amplifier and micro-sensors. The micro-sensors are coupled on the surface of a tested tensile test piece by using a coupling agent, and each end of the tested tensile test piece is fixed with one micro-sensor. According to the platform, under the circumstance of sudden change of an acoustic emission source signal, the relation between acoustic signal parameter(s) and the damage mechanism is effectively established combining with the real-time change of a meso-damage image under in-situ tension.

Description

Technical field: [0001] The invention relates to the field of detection of mesoscopic damage based on acoustic emission technology, and specifically relates to an acoustic testing platform and a testing method capable of characterizing changes in metal mesoscopic damage. Background technique: [0002] Metal materials are widely used in aerospace, automobile, bridge, petrochemical and other industries. Under the joint action of load and environment, metal materials may undergo various forms of failure and damage, and the number of catastrophic accidents caused by structural failure is increasing sharply. Therefore, mastering the failure mechanism of engineering structures, better reducing structural weight, increasing load and prolonging life are the research hotspots in the field of engineering technology. From the perspective of metal mesoscopic damage mechanics, exploring the early damage mechanism of metal materials is a commonly used theoretical analysis method at prese...

AI Technical Summary

Problems solved by technology

[0004] An object of the present invention is to provide an acoustic test platform that can characterize the change of metal mesoscopic damage. This acoustic test platform that can characterize the change of metal mesoscopic damage is used to solve the problem that the detection of mechanical equipment damage is not timely in the prior art. The problem that metal material damage cannot be found at the initial stage of defect generation, another object of the present invention is to provide a test method for an acoustic test platform that can characterize the metal mesoscopic damage process

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