Brief introduction The Hopkinson pressure bar is a specialized equipment to study the dynamic mechanical properties of materials under one-dimensional stress state. It's used to determine the stress and strain characteristics of material under dynamic impact. It's mainly used to obtain the stress-strain curve of metal material, composite material.
Working principle High pressure air source supply power and high precision launch pipe supply acceleration channel, use impact rod to strike the Incident rod and transmission rod, thus to apply axial load on the sample between incident rod and transmission rod; strain gauge generates electric signal and acquired by data acquisition system, and software will process the data. Structure The Hopkinson pressure bar is mainly comprised of launch device, gun barrel, incident rod, transmission rod, absorption rod, buffer, guide rail, base, speedometer, high pressure air source.
Features Better compatibility: equipped with 20mm and 14.5mm pressure bar, only need to replace the pressure bar, thus can cover more sizes pressure bar; Good expansibility: interface reserved, 2-dimensional or 3-dimensional confining pressure can be freely increased on request, as well as the high-low temperature and other environment module; Intelligent operation: human-machine interface, remote control of launch, guaranteed testing accuracy and repeatability; Good stability: cast iron guiding rail, no deformation, no vibration under high speed impact
Specifications 1. Scope of application: dynamic performance test at high strain rate can be carried out for sand and gravel, concrete, reinforced concrete, metal and non-metallic foam materials, composite materials, polymer materials, etc. It is also possible to test the dynamic performance of the sample under different peripheral constraints. 2. Loading mode: pneumatic or electromagnetic loading 3. Maximum diameter of sample: 100mm 4. Strain rate: 1000/s~20000/s 5. Standard poles that can be used: 4-100mm (one set of equipment can be equipped with 2-3 sets of poles with different specifications at the same time) 6. Control mode: double safety switch, pneumatic control 7. Boosting method: air compressor (high-pressure nitrogen optional) 8. Heating mode: PID temperature control, with water cooling system (optional) 9. Cooling method: liquid nitrogen or alcohol (optional) 10. Bullet speed measurement: laser speed measurement system (optional) 11. Surrounding pressure and axle pressure: hydraulic full-automatic pressurization system (optional) 12. Tailstock buffer: mechanical or hydro-pneumatic combined buffer 13. It can be used for analysis and test of other dynamic impact mechanics 14. Comply with the national standard: GBT 34108-2017 Metallic materials - High strain rate room temperature compression test method 15. 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, Φ 12, Φ 10, Φ 8, Φ 4, etc. A set of equipment can be equipped with multiple sets of rod systems, and the rod and rod can be installed on the same main body, sharing the acquisition system and gas drive system; 16. Rod system and bullet: material is 18Ni, spring steel, titanium and other high-strength steel; The metal materials are subject to overheating treatment, and the perpendicularity of all rod end faces can reach within 0.02, and the rod diameter and end face roughness can reach above Ra0.8.
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