1、 Brief intbaruction of split Hopkinson Tension Bar (SHTB) alt1200
Hopkinson bar is an effective experimental device to study the dynamic mechanical properties of materials under one-dimensional stress. Since Kolsky invented it in 1949 and used it to study the dynamic mechanical properties of materials under one-dimensional stress state, the experimental device has been improved a lot and the experimental technology has been improved continuously.
The device tests the strain of the specimen when it is impacted by the dynamic shock wave through the uniform transmission of the stress wave, and calculates the corresponding parameters such as strain rate, stress, strain energy, incident energy, transmission energy, reflection energy, particle impact velocity and high g value according to the experimental parameters.
Application:
it can test dynamic properties of sand, concrete, reinforced concrete, metal and non-metallic foam, composite and polymer materials at high strain rates. It can also be used to test the dynamic performance of the sample under different peripheral constraints. Loading mode: pneumatic or electromagnetic
Maximum diameter of sample: 100mm
Strain rate: 1000 / S ~ 20000 / S
Standard pole to be used: 4-100mm (one set of equipment can be equipped with 2-3 sets of poles of different specifications at the same time)
Control mode: double safety switch, pneumatic control
Pressurization method: air compressor (high pressure nitrogen optional)
Heating mode: PID temperature control, with water cooling system (optional) Cooling method: liquid nitrogen or alcohol (optional)
Bullet speed measurement: laser speed measurement system (optional)
Confining pressure and axial pressure: hydraulic full-automatic pressure system (optional)
Tailstock buffer: mechanical or liquid gas combined buffer It can be used in the analysis and test of other dynamic impact mechanics
In line with national standard: GBT 30069.1-2013 high strain rate tensile test of metal materials
2、 Superior performance of Hopkinson Tension Bar (SHTB) alt1200
equipment ALT1200 adopts the cabinet structure design, which directly installs the launch system and the Tension Bar system between the two operating consoles. All the spare parts are installed inside the workbench, which is neat, beautiful and practical. The launch and control system is installed in the front console, the operator can complete the operation of bullet launch and bullet recovery data processing in front of the computer, which is very convenient. The high temperature heating system and synchronous cylinder are installed in the rear console, and the target temperature can be adjusted at will through the PID control system. The water cooling system is installed outside the high temperature furnace to ensure the safety of operation. Each bar system can be installed on the same specification support platform through different diameter bar sleeve with bearing, and the pressing bar can be replaced at will. The same system can also be equipped with two sets of bases to adapt to the bar diameter of different diameters. Through the system adjustment of the bar and the launching system, the equipment can impact the classic regular square wave.
1. It can change the diameter of different bars quickly: adopt the diagonal compression bar support, in a Huo set, it is convenient to realize all kinds of Huo bar tests by changing the barrel, achieve all kinds of experimental purposes, and save money for users.
2. The main body is designed with cabinet structure and profile steel track, which has strong practicability, convenient operation and appearance in line with modern industrial aesthetic concept.
3. The Tension Bar and pressure bar can share a main body, a collection system and a gas chamber emission system. The Tension Bar bracket adopts a bearing bracket, which is convenient for installation and sliding.
4. The operation panel is integrated on the cabinet behind the gun barrel to ensure the operation safety. The impact bar can be automatically launched and returned to its original position. Double opening and closing are adopted to avoid misfiring.
5. Eliminate the external electromagnetic interference and prevent the acquisition system from triggering by mistake. The launch control system adopts pneumatic control system.
6. The data acquisition software can select the start and end points of the waveform at will, and can select any band data for analysis.
7. The data processing software of Hopkinson Tension Bar can automatically identify the jumping point and the ending point of the transmitted and reflected waves, as well as the manual identification. At the same time, it can test the square sample, and calculate the impact stress-strain, strain energy, particle velocity, reflection energy, transmission energy and other data of the sample. It is simple to operate and convenient to use. According to the first-class level of the current industry.
8. Rod diameter: Φ 100, Φ 80, Φ 75, Φ 70, Φ 50, Φ 37, Φ 30, Φ 20, Φ 18, Φ 16, Φ 14.5, etc. A set of equipment can be equipped with multiple sets of bar systems, and the bar and bar can be installed in the same main body, sharing the acquisition system and gas drive system;
9. Rod system and bullet: the material is 18Ni, spring steel, titanium and other high-strength steel; the metal materials are overheated, and the perpendicularity of all bar end faces can be within 0.02, and the bar diameter and end face roughness can be above Ra0.8.
3、 ALT1200 data acquisition system of Hopkinson Tension Bar (SHTB)
Equipment function intbaruction and main technical indexes: ALT1200 ultra dynamic data acquisition system is specially used for the test and analysis of hobkinson bar experiment. The highest transient sampling rate of the system is 40MHz, each channel is independent of a / D analog-to-digital converter, and the external strain conditioner completes the stress-strain test and analysis of 1 / 4 bridge, half bridge and full bridge states. The system has the functions of real-time acquisition, real-time display, real-time storage and real-time analysis of the measured signal, automatic test control and data waveform analysis and processing. 4、 Brief intbaruction to alt1200 software of SHTB The data analysis software of Hopkinson bar is developed by Archimedes industrial technology company. It has very powerful functions. It can calculate dynamic compression, tension, torsion, bending, shear and other items at the same time, and get the data of dynamic stress, strain, strain rate, strain energy, incident energy, transmission energy, reflection energy, particle velocity, high g value, sample temperature rise and so on.
Main operation interface of alt1200
Automatically move the wave, intercept the wave and calculate the result automatically
Dynamic stress-strain curve
Strain rate 1/S
Instant temperature rise of impact specimen (° C)
Test results (strain rate, stress strain, strain energy, transmission energy, reflection energy, reflection energy, particle velocity, high g value, instantaneous temperature)
High g value
Conservation of energy (incident energy = strain energy + reflection energy + transmission energy)
5、 Specific engineering application:
It can carry out different bar diameter, different confining pressure, different temperature and compression, bending, tensile and shear tests, etc. the specific design is according to the customer's requirements. Generally, it has the following applications:
(1) The dynamic mechanical properties of the material under the coupling action of high temperature and high strain rate were tested by using the synchronous assembly system;
(2) Single pulse loading and its application in dynamic damage mechanics are realized in Hopkinson Tension Bar technology;
(3) The dynamic crack initiation toughness of the material was measured by loading three-point bending specimen with Hopkinson Tension Bar;
(4) The high G acceleration sensor was calibrated by Hopkinson Tension Bar technique;
(5) Stress and strain test of rapid tool drop
(6) Hopkinson Tension Bar test under true and false triaxial confining pressures
(7) Stress and strain test of other dynamic impact mechanics
6、 Equipment picture and Description:
Tension and compression bar integrated machine (with high and low temperature test)
User site rendering
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