1.Summarize: Electro-hydraulic servo fatigue testing machine <testing machine for short> is mainly used to test the dynamic characteristics of metals, non-metals and composite materials at room temperature (or high and low temperature, corrosion environment). The testing machine can perform the following tests:
Tensile, compression test
Crack Growth Test
The closed-loop servo control system composed of electrical controller, servo valve, load sensor, displacement sensor, extensometer and computer can automatically and accurately control the test process, and automatically measure test parameters such as test force, displacement, deformation, torque, angle, etc. . The testing machine can realize sine wave, triangle wave, square wave, sawtooth wave, anti-sawtooth wave, pulse wave and other waveforms, and can perform mechanical tests such as tension, compression, bending, low cycle and high cycle fatigue. Environmental test devices can also be configured to complete environmental simulation tests at different temperatures. The testing machine is flexible and convenient to operate. The lifting, locking, and sample clamping of the moving beam are all completed by button operation. Advanced hydraulic servo drive technology is used for loading, high-precision dynamic load sensor and high-resolution magnetostrictive displacement sensor to measure the force of the test piece. value and displacement. The fully digital measurement and control system realizes PID control of force, deformation and displacement, and smooth transition between each control. , The test software works under WINDOWS XP/Win7 Chinese environment, with powerful data processing functions, test conditions and test results are automatically saved, displayed and printed. The test process is all controlled by computer. The test machine is an ideal cost-effective test system for scientific research institutes, metallurgical construction, national defense and colleges and universities, machinery manufacturing, transportation and other industries. 2.Standard 1) GB/T 2611-2007 "General Technical Requirements for Testing Machines" 2) GB/T16825.1-2008 "Inspection of Static Uniaxial Testing Machine Part 1: Inspection and Calibration of Force Measuring System of Tensile and (or) Compression Testing Machine" 3) GB/T 16826-2008 "Electro-hydraulic servo universal testing machine" 4) JB/T 8612-1997 "Electro-hydraulic servo universal testing machine" 5) JB9397-2002 "Technical Conditions for Tension and Compression Fatigue Testing Machines" 6) GB/T 3075-2008 "Metal Axial Fatigue Test Method" 7) GB/T15248-2008 "Metallic Material Axial Constant Amplitude Low Cycle Fatigue Test Method" 8) GB/T21143-2007 "Unified test method for quasi-static fracture toughness of metal materials" 9) HG/T 2067-1991 Technical Conditions for Rubber Fatigue Testing Machine 10) ASTM E399-09 Standard test for linear elastic plane strain fracture toughness Kic of metal materials 11) ASTM E1820 2001, a test standard for measuring JIC of fracture toughness
3.Main Parameters 3.1 Maximum test force: 100kN 3.2 Test force measurement range: 2kN~100kN (2%~100%FS) 3.3 Test force resolution code: 1/180000 3.4 Test force indication accuracy: within ±0.5% 3.5 Displacement measurement range: 0~150(±75)(mm) 3.6 Displacement measurement component force: 0.001mm 3.7 The relative error of displacement measurement indication is within ±0.5% 3.8 The relative error of displacement measurement indication is within ±0.5% 3.9 Acquisition frequency: 0.01~100Hz 3.10 Standard test frequency: 0.01-50Hz 3.11 Test waveform sine wave, triangle wave, square wave, half sine wave, half cosine wave, half triangle wave, half square wave, etc. 4.Host main parameters 4.1 Test space (excluding fixtures) mm: 1000 4.2 Internal effective width mm: 600 4.3 Dimensions (length × width × height) mm: 1000 × 650 × 2850 4.4 Weight (approx.) kg: 1500
5. Structural composition 5.1 Main engine: The main engine is composed of a loading frame, an upper-mounted axial linear actuator assembly, a hydraulic servo oil source, a measurement and control system, and test accessories. 5.2 Host loading framework: The loading frame of the main engine is composed of four columns, movable beams and worktables to form a closed loading frame. Compact structure, high rigidity, fast dynamic response. 5.2.1 Axial load capacity: ≥±100kN; 5.2.2 Movable beam: hydraulic lifting, hydraulic locking; 5.2.3 Test space: 600×1000mm<width×height>; 5.2.4 Load Cell: (Transcell) 5.2.4.1 Load Cell capacity: 100kN 5.2.4.2 Load Cell linearity: ±0.1%; 5.2.4.3 Load Cell overload: 150%. 5.3 Hydraulic servo axial linear actuator: 5.3.1 Actuator assembly 5.3.1.1 Structure: It adopts the integrated design of servo actuator, servo valve, load sensor and displacement sensor. 5.3.1.2 Features: The integrated base installation shortens the load chain, improves the system rigidity, and has good resistance to lateral force. 5.3.1.3 Acquisition frequency: 0.01~100Hz (the test frequency generally does not exceed 70Hz); 5.3.1.4 Configuration: a. Linear actuator: 1 piece I. Structure: double-rod double-acting symmetrical structure; II. Maximum test force: 100 kN; III. Rated working pressure: 21Mpa; IV. Piston stroke: ±75mm; Note: Set the hydraulic buffer zone; b. Electro-hydraulic servo valve: (imported brand) I. Model: G761 II. Rated flow: 110 L/min 1 piece III. Rated pressure: 21Mpa IV. Working pressure: 0.5~31.5 Mpa c. One magnetostrictive displacement sensor I. Model: HR Series II. Measuring range: ±75mm III. Resolution: 1um IV. Non-linearity: <±0.01% of full scale> 5.4 Hydraulic servo constant pressure oil source The pumping station is a standardized pumping station with a modular design. In theory, it can be cascaded into a large pumping station with any flow rate, so it has good scalability and flexible use.
The total flow rate is 110L/min, and the pressure is 21Mpa. (Adjusted according to experimental requirements)
Total power 45kW, 380V, three-phase, 50hz, AC.
The pump station is manufactured according to the standard modular design, with mature technology and stable performance; it is equipped with a relay voltage stabilization module and connected to the actuator.
The pump station is composed of oil pump, motor, high and low pressure switching valve group, accumulator, oil filter, oil tank, pipeline system and other parts;
The filtration system adopts three-stage filtration: the oil pump suction port, 100μ; the oil source outlet, the filtration accuracy is 3μ; the relay voltage stabilization module, the filtration accuracy is 3μ.
The oil pump adopts Germaninternal meshing gear pump, which adopts involute internal meshing gear meshing transmission, low noise, excellent durability and long life;
The oil pump motor unit is equipped with a vibration damping device (choose a vibration damping pad) to reduce vibration and noise;
The high and low pressure switching valve group is used to start and stop the hydraulic system.
Fully enclosed standard servo oil tank, the volume of the oil tank is not less than 460L; it has functions such as temperature measurement, air filtration, and oil level display;
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