1. Overview: 

The material fatigue test system is mainly used to test the dynamic characteristics of metal, non-metal and composite materials at room temperature (or high and low temperature, corrosive environment), tensile, compression and shear fatigue endurance tests, crack growth tests, and fracture toughness

This system is a closed-loop servo control system composed of an electrical controller, servo valve, load sensor, displacement sensor, extensometer, and computer. It can automatically and accurately control the test process and automatically measure test parameters such as force, displacement, deformation, torque, and angle. 

The system 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 system operation 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 fully controlled by computers, and the testing machine is an ideal cost-effective testing system for scientific research institutes, metallurgical construction, national defense and military industry, universities, mechanical manufacturing, transportation and other industries.

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. Advantech Industrial Computers and Government Printers;

6. Routine auxiliary equipment related to testing 

3. Main technical indicators: 

4.Main Unit Introduction: 

1. Host loading framework. 

A two column frame structure with servo actuators placed underneath. 

● Our standardized unit products;

● Two column main frame, with hard chromium plating and polishing treatment on the columns. The effective distance between the columns is 545mm; The diameter of the column is 80mm. 

● Upper crossbeam: hydraulic lifting, hydraulic locking. Maximum adjustable test net space: 0-800mm. 

● Workbench height: 825mm. 

● Frame stiffness: 3 × 108 N/m ； 

2. Servo actuator.

● Maximum test force: ± 100KN 

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

● Special clearance bearing sealing dynamic servo actuator suitable for dynamic and static tests; 

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

● The piston is sealed with aluminum bronze clearance bearings between the cylinder body, piston rod and end cover, which reduces the friction resistance of the actuator, increases its stiffness, and has strong resistance to direction measurement, greatly improving the testing accuracy and the true restoration of data;

● 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, used for tensile and compressive bidirectional fatigue testing. The maximum test force is ± 12.5kN, with an overload capacity of 150%. It is compatible with the control system and has a reading error of ± 1%; Before leaving the factory, the sensor calibration is completed;

● Displacement sensor: a product of NOVO company in Germany, a magnetostrictive non-contact displacement sensor, with an effective range (maximum displacement) of ± 75mm, in conjunction with the control system, with an indication error of ± 0.5% FS; Before leaving the factory, the sensor calibration is completed. 

● Servo valve: American MOOG company servo valve, single valve flow rate 63L/min, pressure 21Mpa; Directly integrate the servo valve mounting seat with the actuator; 

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 40L/min, and the pressure is 21Mpa. (Can be adjusted according to experimental requirements)

● Total power 22kW, 380V, three-phase, 50Hz, AC. 

● The pump station is designed and manufactured according to standard modularization, with mature technology and stable performance; Configure a relay voltage regulator module and connect it to the actuator. 

● Sound insulation design, working noise below 75dB; 

● The pump station is composed of oil pump, motor, high and low pressure switching valve group, accumulator, oil filter, oil tank, pipeline system, etc; 

● The filtration system adopts three stages of filtration: oil pump suction port, 100 μ； Oil source outlet, filtration accuracy 3 μ； Relay voltage regulator module, filtering accuracy 3 μ。

● The oil pump adopts a German Rexroth constant pressure variable displacement pump, which adopts an involute internal meshing gear transmission with low noise and excellent durability and long service life; 

● The oil pump motor set is equipped with a damping device (using a damping pad) to reduce vibration and noise; 

● Use high and low pressure switching valve groups for the start and stop of the hydraulic system. 

● Fully enclosed standard servo oil tank, with a capacity of no less than 260L; It has functions such as temperature measurement, air filtration, and oil level display; 

● It has functions such as overheating protection, overcurrent protection, high and low pressure protection, overtemperature protection, flow protection, liquid level protection, etc. 

4. 647 Compulsory Plus Specific

4.1Hydraulic force clamping chuck. a set; 

● Open structure, convenient replacement of jaws. 

● Equipped with self-locking nuts, connected to the upper load sensor and lower actuator piston of the main engine. 

4.2Provide attached interface drawings; 

5. 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. 6. Electrical control system. 

●Cabinet structure, placed near the pump station, with 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: 22kW, AC, 380V, three-phase five wire system. 

●The cabinet is equipped with a voltage and current meter, and is equipped with relevant buttons to control the start and stop of two sets of motors. 

●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. 

● Remote control cabinet. 

● The interaction between computer and PLC can remotely control the pump station;

● The alarm operation indicator light is clear and reliable; 

● Equipped with a remote electronic pressure gauge to monitor the pressure of the pump station, and equipped with various alarm indication functions such as oil filter blockage and temperature exceeding. 

● Safe to use 24V working voltage, safe to use, beautiful appearance, and easy to operate 

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

The second party shall provide relevant parameters and placement design and installation,.

8. Control system and computer software system. 

8.1The 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.); 

● 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: 0.001-800Hz, frequency resolution: 0.001Hz; 

● Control waveform: sine wave, triangle wave, square 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. 

8.2Software 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.

8.3 Computers and Printers. 

Industrial computer: memory: ≥ 8GB, hard disk: ≥ 1T;, Independent graphics card; 

24 "LCED display. 

Win10 operating system. 

9. Test attachments.  Sample stretching aids; Drawings of testing aids; 

10. Spare parts and tools: 

Spare filter element (filtration accuracy 3 µ): 1 piece, used to replace the filter element when the oil filter is clogged;

Flushing module solenoid valve: 1 piece; 

1 set of equipment special tools 

5. 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. 

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

7. Attached are equipment layout drawings and 3D equipment drawings.