HUA370.25 Electro hydraulic servo material fatigue testing system 

1. Overview: 

The electro-hydraulic servo dynamic and static fatigue testing machine is mainly used to test the dynamic characteristics of metals, non-metallic materials, workpieces, structures, etc. at room temperature (or high and low temperature, corrosive environment), conventional tensile, compression, bending tests, dynamic fatigue life tests, fracture mechanics tests, and other process performance tests. It can conduct tension tension compression and compression fatigue tests on plate shaped specimens and bar shaped specimens.

The closed-loop servo control system composed of the electrical controller, servo valve, load sensor, displacement sensor, extensometer, and computer of this machine can automatically and accurately control the test process, and automatically measure test parameters such as force, displacement, deformation, etc.

The testing machine can realize sine wave, triangle wave, square wave, sawtooth wave wave, anti sawtooth wave wave, pulse wave and other waveforms, and can carry out tensile, compression, bending, low cycle and high cycle fatigue and other mechanical tests. Environmental testing devices can also be configured to complete environmental simulation tests at different temperatures. The operation of the testing machine is flexible and convenient, and the lifting, locking, and clamping of the moving crossbeam are all completed by button operation. Advanced hydraulic servo drive technology is used for loading, high-precision dynamic load sensors, and high-resolution magnetostrictive displacement sensors are used to measure the force and displacement of the specimen. The fully digital measurement and control system achieves PID control of force, deformation, and displacement, with smooth conversion between each control., The experimental software works in the Windows XP/Win7 Chinese environment, with powerful data processing functions, automatic storage, display, and printing of experimental conditions and results. The testing process is all under computer control, and the testing machine is used in industries such as scientific research institutes, metallurgical construction, national defense and military industry, colleges and universities, mechanical manufacturing, transportation, etc an ideal cost-effective experimental system. 

2. Relevant standards: 

1)GB/T 2611-2007 General technology Requirements for Testing Machines 

2)GB/T16825.1-2008 "Verification of Static Uniaxial Testing Machines - Part 1: Verification and Calibration of Force Measuring Systems for Tension and/or Pressure Testing Machines" 

3)GB/T 16826-2008 "Electrohydraulic Servo Universal Testing Machine" 

4)JB/T 8612-1997 "Electrohydraulic Servo Universal Testing Machine"

5)JB9397-2002 Technical Conditions for Tension Compression Fatigue Testing Machines 

6)GB/T 3075-2008 "Methods for Axial Fatigue Testing of Metals" 

7)GB/T15248-2008 "Test Method for Axial Constant Amplitude Low Cycle Fatigue of Metallic Materials" 

8)GB/T21143-2007 "Unified Test Method for Quasi Static Fracture Toughness of Metallic Materials" 

9)Technical specifications for HG/T 2067-1991 rubber fatigue testing machine 

10)ASTM E399-09 Standard Test for Linear Elastic Plane Strain Fracture Toughness Kic of Metallic Materials

11)ASTM E1820 2001 A test standard for measuring JIC of fracture toughness The main components of this test Equipment are as follows: 

1. High stiffness double column gantry main loading frame; 

2. Intelligent constant pressure silent power source; 

3. Fully digital dynamic and static control system; 

4. Chinese and English human-machine dialogue lower computer operation application software; 

5. Industrial Computers and Government Printers;

6. Routine auxiliary equipment related to testing 

Reference layout diagram

3.Main technical indicators: 

4. Main unit introduction: Host loading framework. 

● Two column main frame, with hard chromium plating and polishing treatment on the columns. The effective distance between the columns is 650mm; The diameter of the column is 110mm. 

● Workbench height: floor mounted 300mm, structural 750mm.

● The experimental space is continuously adjustable within 20mm~1000mm; The adjustment method adopts hydraulic drive; After the upper crossbeam is adjusted in place, hydraulic locking or suitable tension and compression test locking methods are used, 

● The lifting adjustment system adopts full hydraulic control, and the hydraulic control valves are all plug-in manual valves to ensure equipment safety. At the same time, it avoids locking failure or inability to release due to the aging of the electromagnetic switch valve circuit 

2. Servo actuator. 

● Maximum dynamic test load: ± 250KN 

● Maximum stroke: ± 75mm (total stroke 150mm);

● High performance dynamic servo actuator suitable for dynamic and static testing; 

● Double output rod, piston rod surface treated with special technology and high gloss treatment, suitable for long-term dynamic testing; 

● The piston and cylinder body, as well as the piston rod and end cover are supported by aluminum bronze support rings and sealed with oil film, resulting in high actuator stiffness, strong resistance to direction measurement, bottom damping, high-frequency response, and high reliability; 

● The actuator has a built-in displacement sensor, an external electro-hydraulic servo valve, and a force sensor, with two closed-loop control circuits for force and displacement; 

● The force sensor is placed at the head of the piston rod and equipped with a pre-stressed ring, which can fully ensure the safe and reliable connection during the dynamic test process;

● Design a hydraulic buffer zone at the limit position of the actuator amplitude to avoid damage caused by runaway operation; 

● Sensors: 

    ▶ Force sensor: a product from Interface Company in the United States, with tensile and compressive bidirectional fatigue and sensor, 300% overload capacity, and 

± 0.0015%/° C temperature compensation function, high signal-to-noise ratio; Linear accuracy meets or exceeds 0.03%; Equipped with partial load compensation function; Equipped with atmospheric pressure replenishment function for the environment; The split calibration method can be used for calibration; Traceable tensile and compressive bidirectional calibration.

   ▶ Displacement sensor: a product  of  NOVO company in Germany, a magnetostrictive non-contact displacement sensor, with an effective range (maximum displacement) of ± 150mm, in conjunction with the control system, with an indication error of ± 0.5% FS; Before leaving the factory, the sensor calibration is completed. 

    ▶ Equipped with atmospheric pressure replenishment function for the environment; The split calibration method can be used for calibration; Traceable tensile and compressive bidirectional calibration. 

● Servo valve: American MOOG company's servo valve has a single valve flow rate of 63L/min and a pressure of 21Mpa,

3. Constant pressure servo power source. 

The constant pressure servo pump station is generally installed centrally in the planned pump room. The piping system leads hydraulic oil near the main engine and connects it to the servo actuator through a hose circuit, oil distributor, and hose circuit. 

The pumping station is a standardized pumping station with modular design, which can theoretically be cascaded into large pumping stations with any flow rate, thus having good scalability and flexible use.

● The total flow rate is 63L/min, and the pressure is 21Mpa. (Adjust according to experimental requirements) 

● Total power 30kW, 380V, three-phase, 50Hz, AC. 

● The pump station adopts a fully enclosed design, which is energy-saving and environmentally friendly. There is no external leakage, avoiding the mixing of dust and oil to form scale. 

● This pump station adopts fully imported motor pump units, and the oil pump adopts the original constant pressure variable displacement pump from Rexroth, Germany, with low noise, environmental protection, and energy conservation! About 40% energy saving compared to traditional pump sets 

● The noise level at 1 meter during load operation is ≤ 70dB;

● The hydraulic system must be started without load, and can be switched between low and high pressure after starting; Equipped with remote program control and local touch mode; 

● Real time display of system parameters such as pressure, temperature, and liquid level; Integrated oil suction, high-pressure, oil return, and filtration devices; Equipped with zero pressure start and high/low pressure switching functions, it can remotely/locally start and stop the hydraulic system; 

● Integrated touch screen PLC for temperature measurement and alarm; 

● Equipped with functions such as air filtration device, oil level display and alarm, self diagnosis, and abnormal shutdown; 

● It can automatically start and stop the cooling system based on the temperature of the hydraulic medium, ensuring the normal working temperature of the hydraulic medium while also having good energy-saving efficiency

4. Pipeline system: 

● All hydraulic soft pipelines are manufactured by Eaton Corporation in the United States. 

● The length of the pipeline between the host and pump station: 3-6m (determined according to the layout of the laboratory); 

● Other hose routes include: hydraulic clamp hose routes, lifting cylinder hose routes, and other complete sets imported from the United States.

5. Electrical control system. 

●Cabinet structure, integrated pump station, Siemens PLC intelligent remote control. 

●The design meets the national design standards for strong current systems; 

●Automatically switch between high and low pressure of the pump station, start at low pressure, and operate at high pressure;

●Total power: 30kW, AC, 380V, three-phase five wire system. 

●Equipped with various protection and alarm functions such as low liquid level, temperature exceeding limit, oil filter blockage, and motor overload; 

●Reasonable layout of wires and cables, convenient maintenance and use, and beautiful appearance; 

●The first party is responsible for power supply. 

6. Closed cooling system (provided by Party A). 

●The cooling system is used in conjunction with the pump station to provide oil temperature cooling for the pump station; 

●Integrated structure, easy to maintain and use, beautiful appearance; 

●The medium is made of coolant, which can be used for a long time in one filling

●Cooling liquid flow rate ≥ 80Lpm;, Water supply pressure: 0.2-0.68MPa adjustable 

●Outlet water temperature ≤ 20 ℃ 

●Compressor refrigeration 

7. Control system and computer software system. 

7.1The main configuration components of the controller are: 

● 1 set of experimental force signal conditioning unit;  ● 1 set of displacement signal conditioning unit;  ● 1 set of secondary servo valve drive unit;  ● 1 set of signal generator unit; ● 1 set of hydraulic control unit (pump station on/off high/low pressure switching, etc.);

7.2Controller Introduction 

● Adopting a fully digital servo controller; PCI bus, compatibility performance; Anti interference and anti vibration; Modular structure, easy to maintain equipment; Manage permissions at different levels to ensure system security; Comply with EN ISO 13849 safety standard specifications; Equipped with external signal triggering and self-locking functions 

● Full digital closed-loop control, allowing for arbitrary signal acquisition for full digital PID control. Closed loop control frequency up to 10kHz;

● Directly integrated servo valve drive unit (both secondary and tertiary servo valve drives are available); 

● Built in signal generator frequency range: 0.001-70Hz, frequency resolution: 0.001Hz; 

● Control waveform: including sine wave, triangle wave, oblique wave, sawtooth wave wave, random wave, free wave, and can realize combined output of various waveforms. 

● Control method: PID closed-loop control of force, displacement, and deformation, and can achieve smooth and undisturbed switching of any control mode; 

● The system has functions such as sensor calibration and reset; 

● Implement high-speed data communication with computers through Ethernet cards;

● Equipped with complete hydraulic control functions, such as controlling pump station on/off, high/low pressure switching, etc; 

● Provide a variety of interface boards to match various sensors and driver units. 

● The system can automatically recognize TEDS sensors and has functions such as sensor calibration and resetting; The control methods must include: load (force), displacement, deformation (strain) control; Adopting PID closed-loop control with feedforward function, different control modes can be smoothly switched without impact; To facilitate the loading and unloading of test specimens and equipment debugging by testing personnel, the controller must be equipped with a remote control handle, and the test data can be directly displayed on the EDC; Control commands have composite functions.

7.3Software system. 

The software system is a mainstream multi-channel dynamic testing system, which is particularly suitable for various scientific research institutions due to its wide range of experimental standards, flexible use, and convenient and fast data import and export. The main functional features include: 

● Developed based on the Win7/10 working platform; 

● Integrate various dynamic testing functions and integration. 

● For dynamic testing, any functional test waveform combination can be defined to form a test spectrum and process, and the testing machine can be controlled to complete various complex functional dynamic fatigue tests.

● For static testing, the main international and domestic GB standard software modules in the field of software integrated material testing are powerful and suitable for both scientific research and conventional process research. 

Various functions such as data collection, testing steps, data storage, and testing protection can be programmed in the form of events to assist users in completing various complex functional testing operations.

8 Computers and printers. 

● Taiwan Advantech brand industrial computer, with a hard drive of 1T or above, an i7 processor or above, 16GB of memory and 8GB of independent display 

● 27 "LCED display. 

● Win7 operating system. 

● HP A4 laser printer. 

● Core Configuration Table 

5.Core configuration 

6.Quotation and delivery time. 

1. Price: Please refer to the commercial quotation letter for details. 

2. Delivery period: Please refer to the business contract for details. 

7.Matters not covered shall be resolved through consultation between both parties. 

8.Attached with equipment layout diagram and 3D equipment diagram