In many fields such as aerospace, automotive manufacturing, rail transportation, construction engineering, biomedical materials and equipment, the mechanical properties of materials - such as tensile strength, yield strength, elastic modulus, elongation, compression performance, bending characteristics, etc. - are the core basis for product design, process optimization, and quality control. To accurately obtain these key parameters, microcomputer controlled electronic universal testing machines have become a standard configuration in modern material laboratories and industrial quality inspection departments. It integrates precision machinery, servo control, sensor technology, and computer software, achieving a leap from "manual loading" to "intelligent testing", and is known as the "intelligent core" of material mechanics performance testing.

1、 Basic structure and working principle

The microcomputer controlled electronic universal testing machine mainly consists of the following five systems:

1. Loading framework: High rigidity double column or four column structure, ensuring minimal deformation during testing and ensuring data accuracy;

2. Servo drive system: using AC servo motors combined with precision ball screws to achieve stepless speed regulation, high response, and low-noise loading control;

3. Force and deformation sensing system: high-precision load sensors (with an accuracy of ± 0.5% or higher) collect loads in real time; The extensometer (contact or non-contact video extensometer) accurately measures the deformation of the gauge length section of the specimen;

4. Control system: With industrial computers or embedded controllers as the core, run specialized testing software;

5. Safety protection device: including overload protection, displacement limit, emergency stop switch, etc., to ensure the safety of equipment and personnel.

Its working principle is that users set testing standards (such as GB/T 228.1, ASTM E8, ISO 6892, etc.) or customize programs in the software, and the system automatically controls the servo motor to apply load at a preset rate, synchronously collects signals such as force, displacement, deformation, etc., real-time draws stress-strain curves, and automatically calculates various mechanical performance indicators.

2、 Core technological advantages

1. High precision and high repeatability

Adopting closed-loop control technology, the loading rate is stable, avoiding fluctuations caused by oil temperature changes in traditional hydraulic presses. The typical force accuracy can reach ± 0.5%, and the displacement resolution can reach 0.001 mm, meeting the needs of scientific research and manufacturing.

2. Multi functional integration

One device can complete various tests such as stretching, compression, bending, shearing, peeling, tearing, etc. By changing the fixture, it can adapt to different samples such as metal, plastic, rubber, composite materials, textiles, biological tissues, etc.

3. Intelligent software platform

Modern testing software (such as Instron Bluehill, MTS TestSuite, domestic Youhong, Shenzhen Xinsansi, etc.) have: one click calling of standard method libraries; Real time curve display and multi-channel data synchronization; Automatically determine yield point and fracture point; Automatically generate test reports that meet CNAS/CMA requirements; Support data export to Excel, PDF, or LIMS systems.

4. Support advanced testing mode

Constant rate loading/displacement/strain control; Cyclic loading (fatigue pre-test); Maintain relaxation creep test; Combined with the environmental chamber, achieve high and low temperature mechanical performance testing (-70 ℃ to+350 ℃).

3、 Typical application scenarios

1. Research and quality inspection of metal materials

Measure the strength and plasticity indicators of steel, aluminum alloy, and titanium alloy to verify the effectiveness of heat treatment or welding processes.

2. Characterization of Polymers and Composite Materials

Test the tensile modulus and elongation at break of engineering plastics; Evaluate the interlaminar shear strength of carbon fiber composite materials.

3. Medical device verification

The mechanical properties of medical catheters, sutures, and artificial joints must comply with standards such as ISO 5834 and ASTM F2150, and electronic universal machines are key equipment for registration and testing.

4. In the field of new energy

The puncture strength of lithium battery separators, the peeling force of photovoltaic backplates, and the compression rebound performance of hydrogen fuel cell bipolar plates all rely on such equipment for evaluation.

5. Universities and research institutions

As an experimental platform for courses such as Materials Mechanics and Polymer Physics, it supports innovative research for undergraduate and graduate students.

4、 Selection and usage points

Range matching: The maximum test force should cover 20% -80% of the expected failure load of the sample, avoiding small load measurement forces or vice versa;

Fixture selection: Wedge fixtures are suitable for metal bars, pneumatic fixtures are suitable for thin films, and three-point bending fixtures are used for brittle materials;

Streptometer configuration: For high-precision deformation data such as elastic modulus and specified plastic tensile strength (Rp0.2), an extensometer must be used;

Calibration and maintenance: The force value and beam displacement need to be verified annually by a measuring institution, and the screw should be lubricated and the sensor should be cleaned regularly.

The microcomputer controlled electronic universal testing machine has long surpassed the scope of traditional "tensile testing machines" and become an intelligent testing terminal that integrates measurement, analysis, storage, and communication. It is not only a routine equipment in the laboratory, but also the cornerstone of new material research and development, product quality assurance, and standard system construction. Under the promotion of the "Made in China 2025" and "New Materials Power" strategies, the deeper the understanding of material properties, the more stringent the requirements for testing accuracy. The microcomputer controlled electronic universal testing machine is the "golden key" that opens the door to the world of materials mechanics - because it knows that every precise stretching is a solemn commitment to safety and innovation.