1. Test material tensile range

The larger the load of the tensile testing machine, the larger the machine volume, while the smaller the load sensor, the higher the accuracy. Of course, the larger the machine, the more expensive it is. So when choosing a tensile testing machine, the bigger the better. But it needs to adapt to the size of the product's power range. There are two types of sensors on the market: imported and domestically produced. Domestic sensors are relatively inexpensive, but poor accuracy can result in zero drift. On the contrary, imported sensors have high accuracy and good repeatability, but they are relatively expensive. The main part of a tensile testing machine is the sensor. During testing, the sensor outputs a force signal to the processor. If the output signal is not accurate, the processed data will definitely be inaccurate, and the tensile testing machine will lose its monitoring and testing capabilities.

2. Test itinerary

The displacement measurement system equipped with the tensile testing machine only measures the distance of the transverse beam movement of the tensile testing machine. If there is a requirement for elongation, such as measuring the elongation of rubber products, an additional large deformation testing frame and a large deformation extensometer are required. For metal materials with relatively small elongation, a small deformation extensometer (metal extensometer) is added. Large deformation and small deformation (metal extensometer) refer to the displacement between two points during the stretching process of the test sample, which has high accuracy. According to the size of the products that your company needs to test, choose the model with small sample volume and low tensile force: single column tensile machine. For samples with larger volume and higher tensile strength, a double column tensile testing machine is required, with a typical tensile testing machine stroke of around 600mm. For materials with an elongation rate exceeding 1000%, a stroke of 1000 or 1200mm can be selected

3. Test speed

Some of the equipment on the market is between 50-500 mm/min, while others are between 0.001 and 500 mm/min. The former generally uses ordinary trapezoidal screws with speed regulating motors or variable frequency speed regulating systems, which have lower costs and greater wear and tear. Over time, excessive experimentation can cause shaking of the connecting plate, affecting testing accuracy. Moreover, if used for a short period of time, the machine may produce loud noise and be prone to damage. The latter uses a servo system equipped with ball screws, which has high accuracy, stable speed, low wear, and good durability. The repeatability of the measured experiment is also good. The standards have specified test conditions, such as what material and how much speed, because the measured force values vary depending on the speed. If there are not many tests and the power is not strong, it is more economical and practical to choose a regular trapezoidal screw with a speed regulating motor or a variable frequency speed regulating system.

4. Measurement accuracy

Accuracy issues, including force measurement accuracy, velocity accuracy, deformation accuracy, and displacement accuracy. When making a purchase, consider your own needs. If you require high precision, you need to pay special attention to this.

5. Manufacturer standard configuration issue

There are three basic configurations for intelligence: host, microcomputer, and printer. If the microcomputer has strong functions, it can print directly. In addition, it can also be equipped with a regular computer for complex data analysis, such as data editing, local zooming in, adjustable report format, and group style statistical analysis. If a computer is used, the manufacturer will add the corresponding control system.

6. Output results

The output results of the experiment can be set arbitrarily: force value, elongation, tensile strength, elongation at fixed force, and elongation at fixed force