Biaxial tensile testing machine

WABF-10TBiaxial tensile testing machineIt is a new type of material mechanical property testing and online observation system, used for in-situ tensile mechanical property testing and analysis research of specimens. It can test material tensile test force, tensile strength, force-displacement, force-time, displacement-time, stress-strain and other test parameters.The testing machine has four-channel alternating force tests of tension, compression, and fatigue in the biomaterial plane, as well as single/double-channel tension, compression, bending, shear, fatigue, and other test functions.The loading host adopts a special structure to implement a four-channel symmetrical loading method of synchronous/asynchronous tension (compression) to ensure that the center position of the loaded specimen remains unchanged and there is no obvious mechanical backlash during the test.Using the corresponding fixtures, mechanical experiments including tension, compression, fatigue, bending, shear, etc. can be realized.The tensile strain test is carried out with the video strain measurement system to realize real-time calculation and analysis of bidirectional strain in the central area and full-field strain cloud diagram drawing, which effectively avoids the influence of concentrated stress at the clamping end, and the test results are closer to the real values.

The multi-channel controller has a 32-bit function generator, with a maximum data sampling frequency of 1000 times per second, and supports sine wave, triangle wave, trapezoidal wave, and block wave control waveforms.The control mode of the control system can realize four control modes: displacement, force, strain and program control. Under the above control modes, static tension and compression tests and dynamic reciprocating tests such as sine wave and triangle wave can be realized. Multi-channel servo control can provide servo closed loop for all actuators.Controlled, the test mode can support uniaxial stretching, biaxial proportional stretching, biaxial non-proportional stretching, and loading and unloading cycle tests (low cycle fatigue). It is compatible with non-contact strain measurement systems (such as DIC digital speckle correlation method), high and low temperature environmental chambers, etc. for multi-field coupling testing.

The loading mode of the mechanical testing software provides test plans such as tensile test, compression test, fatigue test, creep test and relaxation test. It has multi-module settings and can realize high and low cycle fatigue tests, fracture mechanics tests, spectrum load tests, multi-axis load tests and data analysis and reporting. It supports the playback of periodic sine, triangle waves, square waves, trapezoidal waves, ramps, superimposed waves and hold command signals as well as predefined block wave/spectrum load random wave files.The test system accurately reads parameters such as axial force, displacement, and strain through a variety of high-precision sensors, and uses high-speed DSPThe processor's controller performs high-speed, high-precision closed-loop control of dual channels. Combined with the mechanical testing software package, it can easily set parameters such as test loading mode, frequency, number of cycles, and can adjust PIDF control parameters. It has a pressure difference compensation control function and a dynamic control accuracy higher than ±1.0% FS; control method: support force, displacement, fully digital PI closed-loop control of deformation, the control mode can be switched smoothly, and can support customized test plans, real-time drawing of force-displacement, stress-strain curves, multi-curve overlay comparison function, support automatic identification and calibration of sensors, real-time test parameter control and adjustment, real-time adjustment of waveforms, and real-time adjustment of control parameters without stopping the test.
Main technical parameters:

1. Force loading test system:

1.1 Multi-channel servo control can provide servo closed-loop control for all actuators. The test mode can support uniaxial stretching, biaxial proportional stretching, biaxial non-proportional stretching, and loading and unloading cycle tests (low cycle fatigue);

1.2 The maximum sampling frequency of data is 1000 times per second;

1.3 Control method: supports full digital PI closed-loop control of force, displacement, and deformation, and the control mode can be switched smoothly;

1.4 It can adjust PIDF control parameters, has pressure difference compensation control function, and the dynamic control accuracy is higher than ±1.0% FS;

1.5 It can support customized test plans, draw force-displacement and stress-strain curves in real time, and has the function of superimposing and comparing multiple curves;

1.6 Compatible with non-contact strain measurement systems (such as DIC digital speckle correlation method), high and low temperature environmental chambers, etc. for multi-field coupling testing;

1.7 Multi-module settings can realize high and low cycle fatigue tests, fracture mechanics tests, spectral load tests, multi-axis loading tests, and data analysis and reporting;

1.8 Supports the playback of periodic sine, triangle waves, square waves, trapezoidal waves, ramps, superimposed waves and hold command signals as well as predefined block waves/spectrum-carrying random wave files;

1.9 Supports automatic identification and calibration of sensors, real-time test parameter control and adjustment, real-time waveform adjustment, and real-time adjustment of control parameters without stopping the test.

2. Load sensor:

2.1 Equipped with 4 load sensors, the measuring range is 10kN, the error is 0.5%, and the linear accuracy can reach 0.03%;

2.2 Fatigue loading can be achieved, the resolution is no higher than 1N, and the dynamic control accuracy is no less than 0.5%;

2.3 It has temperature compensation function and eccentric load compensation function;

3. Displacement sensor;

3.1 Equipped with 4 displacement sensors, the measuring range is not less than 50mm, and the displacement resolution is not less than 0.001mm;

3.2 Speed range 0.001 ~ 500 mm/min, stepless speed regulation;

4. Fatigue sensor:

4.1 Equipped with 4 independently controllable high-precision fatigue sensors, the load measurement range is not less than 5kN;

4.2 Installed outside the environmental cabin and not affected by temperature and humidity.