The invention discloses a test method for measuring rock wave velocity in a non-contact manner in a fidelity environment. The test method comprises the steps of selecting a cylindrical container, fixedly arranging a sound wave emission probe and a sound wave receiving probe in the cylindrical container through two fixing devices, selecting a sound wave test system provided with a waveform signal generator and a signal acquisition card, connecting the sound wave test system with the sound wave receiving probe and the sound wave emission probe, injecting a liquid sound wave transmission medium into the cylindrical container, and realizing the non-contact rock wave velocity measurement in the fidelity environment. The required equipment is simple, the manufacturing cost is low, and the measurement method is simple; the non-contact rock sound wave test can be realized by using a common acoustic emission test system; the rock sound wave test efficiency can be greatly improved, the support can be provided for the later-stage continuous rock physical property test integration work, and the method has important significance for deeply researching the mechanical property of the deep in-siturock.

Test method for measuring rock wave velocity in non-contact manner under fidelity environment

The invention discloses a vertical honeycomb splicing interface water-spraying penetration type ultrasonic detection method. The vertical honeycomb splicing interface water-spraying penetration type ultrasonic detection method comprises the following steps that a multilayer honeycomb structure is vertically spliced; a layer of detachable skin is paved and pasted on each of the upper surface and the lower surface of the obtained multilayer honeycomb structure; first curing treatment is conducted on the multilayer honeycomb structure paved with the detachable skin; water-spraying penetration type ultrasonic C scanning detection is conducted on the multilayer honeycomb structure subjected to primary curing, and whether all honeycomb splicing interfaces are debonded or not is detected; if allthe honeycomb splicing interfaces do not have the debonding defect, the detachable skins on the upper surface and the lower surface of the multilayer honeycomb structure are torn off; and surface skins are pasted to the upper surface and the lower surface of the multilayer honeycomb structure, secondary curing is conducted on the multilayer honeycomb structure pasted with the surface skins, and vertically-spliced multilayer honeycomb structure parts are obtained. According to the vertical honeycomb splicing interface water-spraying penetration type ultrasonic detection method, the quality of the vertically-spliced multilayer honeycomb sandwich structure part can be guaranteed, the scrap risk of the multilayer honeycomb sandwich structure part is reduced, and the production cost is saved advantageously.

Vertical honeycomb splicing interface water-spraying penetration type ultrasonic detection method

The invention discloses an air coupling ultrasonic detection method for vertical honeycomb spliced interfaces. The air coupling ultrasonic detection method comprises the following steps: a multi-layerhoneycomb structure is vertically spliced; a layer of detachable skin is laid on each of the upper surface and the lower surface of the obtained multi-layer honeycomb structure; first curing treatment is conducted on the multi-layer honeycomb structure paved with the detachable skin; air coupling ultrasonic detection is conducted on the multi-layer honeycomb structure subjected to primary curingtreatment, and whether all the honeycomb spliced interfaces are debonded or not is detected; if all honeycomb spliced interfaces do not have the debonding defect, the detachable skin on the upper surface and the lower surface of the multi-layer honeycomb structure is torn off; and surface skin is bonded to the upper surface and the lower surface of the multi-layer honeycomb structure, secondary curing is conducted on the multi-layer honeycomb structure bonded with the surface skin, and a vertically-spliced multi-layer honeycomb structure part is obtained. The air coupling ultrasonic detectionmethod for the vertical honeycomb spliced interfaces is high in detection accuracy, the quality of vertically-spliced multi-layer honeycomb sandwich structure part can be guaranteed, and safe and reliable product manufacturing is guaranteed.

Air coupling ultrasonic detection method for vertical honeycomb spliced interfaces

The invention provides a method for testing the damage depth of a composite laminate structure. The method for testing the damage depth of the composite laminate structure is used for testing the layered damage by a pulsed ultrasonic reflection method. The method for testing the damage depth of the composite laminate structure comprises the following steps that a stepped reference block with the same prepreg material, ply direction, curing process and surface state as a tested piece is designed, wherein the thickest part of the reference block is the same as the thickness of a laminate of a tested object, the thickness is sequentially reduced based on the thickness of a ply, a probe is placed on the tested object in a coupled mode, the grid number a between a bottom echo and an initial wave on a testing screen is recorded at the moment, and when the layered damage occurs in the interior, the grid number b between a layered echo and the initial wave on the testing screen is recorded atthe moment, and then the probe is adopted to find the position where the grid number between the bottom echo and the initial wave is b near the position with the ply number which is b/a multiply by the total ply number of the tested object of the reference block, and the damage position is located between the corresponding lay and the next lay. The depth of layered damages to each layer can be accurately measured, so that the detection accuracy is remarkably improved.

Method for testing damage depth of composite laminate structure

The invention relates to ultrafast laser-water jet assisted mechanical coupling multiple hole drilling processing equipment which comprises a jet cutting head and a laser probe. The jet cutting head and the laser probe are arranged on a coupling device; the coupling device is arranged on an adjusting device; the adjusting device is connected with a water jet assisted mechanical cutting system andan optical system; the water jet assisted mechanical cutting system is connected with a computer numerical control (CNC) processing center; the CNC processing center is connected with an industrial personal computer; the optical system is connected with the industrial personal computer; the industrial personal computer is further connected with a spectrometer; the spectrometer is connected with aholocamera; and the holocamera is used for shooting optical information of a hole at the position to be processed in real time. The equipment further comprises a pulse generator, wherein the pulse generator sends out a stress wave to enter the inside of the hole at the processed position so as to detect the punching situation; a stress wave sensor is further arranged on the holocamera; and a wavedetector for receiving a signal of the stress wave sensor is arranged in the industrial personal computer. The invention further comprises a method for drilling by utilizing the equipment.

Ultrafast laser-water jet assisted mechanical coupling multiple hole drilling processing equipment and method for composite thick plate

The invention belongs to a non-destructive testing technology, and relates to a method for determining ultrasonic-acoustic emission detection defect depth of a composite material in the fields of aviation, spaceflight, weapons, ships, metallurgy, steel, traffic, building and the like. The method comprises the following steps: firstly, preparing a thickness calibration test block; secondly, obtaining a thickness reference signal of the thickness calibration test block and checking the defect depth; finally, determining the detected defect depth. According to the method disclosed by the invention, by utilizing a time domain relation between n emission behavior of sound waves and defects in a detected material or the structure and adopting time-domain pulse characteristics of improved ultrasonic-acoustic emission signals, the ultrasonic-acoustic emission longitudinal resolution can be increased, and the defect depth can be more favorably and accurately detected; the method can be more easily realized, is very fast and easy to operate and master, and has better engineering detection and application practicability; the method is more beneficial for quality control of detection results,so that popularization and application of an ultrasonic-acoustic emission method can be more facilitated, and the ultrasonic-acoustic emission method can more favorably play a role in engineering.

Method for determining ultrasonic-acoustic emission detection defect depth of composite material

The method belongs to the technical fields of aerospace, traffic, building, nondestructive detection and the like, and relates to a defect recognition method based on an ultrasonic position signal detection honeycomb sandwich structure. A defect judging method based on ultrasonic position signals is provided, and according to the overall change rule of the ultrasonic position signals of each detection position area, the defect judging can be carried out very visually, the ultrasonic signal change caused by the defect can be clearly determined, the defect judging is carried out, the defect judging difficulty is remarkably simplified, the defect judgment accuracy and the defect detection rate are remarkably improved, and the defect misjudgment rate is reduced.

Defect recognition method based on ultrasonic position signal detection honeycomb sandwich structure

The invention belongs to the technical field of aviation and aerospace, transportation, construction, non-destructive detection and the like, and relates to a honeycomb sandwich structure detection method based on position-ultrasound signals. According to the honeycomb sandwich structure detection method proposed by the invention, inspectors can simultaneously observe the ultrasonic signals corresponding to each detection position point in each scanning row or column and the changes of the ultrasonic signals on an instrument screen, and then the discrimination of defects and the ultrasonic detection of the honeycomb structure can be carried out more intuitively according to the change of P(x,y)-A(t) signals displayed on the instrument screen. Since the inspectors can simultaneously observethe ultrasonic signals corresponding to each detection position point in each scanning row or column and the changes of the ultrasonic signals on the instrument screen, and then the discrimination ofthe defects and the ultrasonic detection of the honeycomb structure can be carried out more intuitively according to the change of the P(x,y)-A(t) signals displayed on the instrument screen, the difficulty of discriminating the defects is simplified, and thus the accuracy of defect discrimination is improved, the detection rate of the defects is improved, and the misjudgment rate of the defects is reduced.

Honeycomb sandwich structure detection method based on position-ultrasound signals

The invention belongs to the lossless detection technology, relates to a composite material structure and metal material nondestructive test for the fields of aviation, spaceflight, military, ships, metallurgy, steel, traffic, buildings, and the like, and particularly relates to an actively scanning and receiving type high-resolution pulse ultrasonic-acoustic emission detection method. The methodcomprises performing auxiliary scanning by using a receiving transducer; and performing analysis on an active scanning reception and a signal display of a pulse acoustic emission wave to realize high-resolution pulse ultrasonic acoustic emission detection of a detected part. The method does not need external mechanical force loading on the detected part or structure, so that the method is suitablefor detection of parts or structures under the standing condition. A transducer does not need to be fixedly attached to the surface of the detected part or structure, so as to achieve automatic scanning detection and imaging analysis. The defect detection rate is independent of the number and the position of the arranged transducer, so as to overcome the risk of leak detection in the presence ofconventional acoustic emissions.

Liu Feifei

Papers

Method for determining ultrasonic-acoustic emission detection defect depth of composite material

Defect recognition method based on ultrasonic position signal detection honeycomb sandwich structure

Honeycomb sandwich structure detection method based on position-ultrasound signals

Actively scanning and receiving type high-resolution pulse ultrasonic-acoustic emission detection method