Provided are an energy absorbing and buffering device applied to a dynamic true triaxial electromagnetic Hopkinson bar and a testing and using method thereof. The device comprises an energy absorbing and buffering ring, an exhaust pipe and an inert gas storage bin. According to the testing and using method, the energy absorbing and buffering device is utilized and connected with a waveguide bar through a middle hollow structure; and a rear end of the energy absorbing and buffering ring is tightly attached to a baffle at a confining pressure loading end. The energy absorbing and buffering device provides energy absorbing and buffering for the waveguide bar, which prolongs a service life of the waveguide bar under an impact load.

Provided are an energy absorbing and buffering device applied to a dynamic true triaxial electromagnetic Hopkinson bar and a testing and using method thereof. The device comprises an energy absorbing and buffering ring, an exhaust pipe and an inert gas storage bin. According to the testing and using method, the energy absorbing and buffering device is utilized and connected with a waveguide bar through a middle hollow structure; and a rear end of the energy absorbing and buffering ring is tightly attached to a baffle at a confining pressure loading end. The energy absorbing and buffering device provides energy absorbing and buffering for the waveguide bar, which prolongs a service life of the waveguide bar under an impact load.

A defect detection method and device based on nonlinear system identification are provided. The defect detection method includes: performing, by a modal force hammer, hammer excitation on a test specimen according to a test schedule to generate an excitation signal and a response signal; acquiring, by a laser vibrometer, the excitation signal and the response signal; performing parameter calculation on the excitation signal and the response signal to obtain model parameters; constructing an initial Hammerstein model based on the model parameters; optimizing the initial Hammerstein model to obtain a Hammerstein model of the test specimen; adjusting the Hammerstein model of the test specimen by using a cross-validation method; perform defect determination based on the Hammerstein model of the test specimen adjusted and a pre-constructed template specimen model to obtain a determination result, and determining whether the test specimen is defective based on the determination result.

An electric-hydraulic Brinell hardness testing head and a portable electric-hydraulic Brinell hardness tester. A controller, a battery pack and a motor are mounted on a hydraulic integrated block, an electric plunger pump is mounted in the hydraulic integrated block, and a check valve is mounted in a cartridge valve seat, which are advantageous in that by controlling the motor-driven miniature electric plunger pump with the controller to realize durable force applying, stability and accuracy of test force within retention time are realized, so that the test principle, the test force accuracy, an indication error, and a repeatability error of hardness measurement results comply with relevant domestic and foreign standards; and have the characteristics of simple measurement operations, quick measurement process, high efficiency, accurate test results, and high reliability, thereby ensuring the basic requirements for miniaturization, lightweight, and on-site use of portable hardness testers.

The invention provides a test method for quantitatively studying a stress wave propagation law of a porous rock, which adopts a dynamic true triaxial electromagnetic Hopkinson bar test system for testing. The test method comprises: quantitatively designing and preparing a cubic porous rock sample required by testing; placing the cubic pore rock sample in a central cubic square chest; and quantitatively studying a high-amplitude stress wave propagation law of the porous rock on the cubic porous rock sample by adopting the dynamic true triaxial electromagnetic Hopkinson bar test system.

The present invention relates to the technical field of equipment for impact tests; more specifically, to an instrumented pendulum for Charpy-type impact tests on miniaturized samples. The instrumented pendulum (1) for miniaturized Charpy impact test, according to the present invention, is characterized in that it comprises a main monolithic part, a cleaver (7) housed in an anterior opening of the main monolithic part, and the at least two additional plates (11, 12) removably attached to the respective sides of the main monolithic part of the instrumented pendulum (1). Further, the present invention relates to a Charpy impact machine comprising the instrumented pendulum (1) and an automatic device (6) for releasing the instrumented pendulum (1) at different values of firing angle.

Provided is a Charpy impact specimen notch inspector and a use method thereof. The Charpy impact specimen notch inspector includes an inspection table, where a specimen auto-alignment mechanism is provided on a top of the inspection table; a support rod is fixedly connected to a rear side of the top of the inspection table; a host is fixedly connected to a front side of the support rod; and a switch button and a universal serial bus (USB) interface are provided at a left side of the host. This application can automatically recognize and align the position of the to-be-inspected Charpy impact specimen, without adjusting the Charpy impact specimen back and forth, thereby improving the inspection efficiency. Moreover, this application can directly compare the notch picture of the Charpy impact specimen with the corresponding standard model based on the residual neural network in inspection to determine whether the notch is qualified.