High and low temperature universal material testing machine: principle, selection and application analysis

The high and low temperature universal material testing machine is a key equipment in the field of material science and quality control. It breaks the limitation of traditional mechanical testing, which is only limited to room temperature. It can accurately evaluate the mechanical properties of materials such as tensile, compression, and bending while simulating special temperature environments. It is widely used in aerospace, new energy vehicles, polymer materials, electronic appliances, and other industries.

Core technology: more than just a "tensile machine"

The high and low temperature universal material testing machine is not simply a combination of a tensile machine and a temperature control box, but a high-precision coupling of the mechanical loading system and the environmental simulation system:

Temperature control system: Utilizing liquid nitrogen or compressor refrigeration, coupled with resistive heating, the temperature control range spans from -180℃ to 350℃ (conventional), and from -70℃ to 300℃. Special high-temperature models can reach up to 1200℃ and 1400℃. The chamber features multi-layer insulation, ensuring excellent temperature uniformity.

Transmission and Sensing: Utilizing high-precision ball screws and load sensors, with typical models such as FL4000GD and FL5000GD, the testing force range spans from 0~1KN to 0~100KN, achieving a testing accuracy level of 0.5. The data acquisition frequency can be selected between 0~1500HZ and 2500HZ, and a customized high-speed acquisition scheme is available.

Three key indicators for model selection

When purchasing, it is important to pay close attention to the following parameters:

Temperature range and uniformity: The temperature zone is selected based on the service environment of the material. For example, elastomers often require low-temperature testing at -40°C, composite materials require high temperatures above 200°C, and metallic materials may require environments above 1200°C.

Strain measurement system: It is recommended to select and configure a high and low temperature deformation measurement system, a high temperature deformation measurement system, a non-contact deformation measurement system, or a laser deformation measurement system according to the testing accuracy requirements, in order to eliminate the thermal expansion and contraction errors of contact sensors at special temperatures.

Test fixtures and accessories: It is necessary to select and match high and low temperature tensile, compression, bending, and shear fixtures, as well as high and low temperature chambers, high temperature chambers, or high temperature furnaces for the testing machine. The material of the fixtures must be resistant to special temperatures (heat-resistant alloy steel for high temperatures, and materials resistant to brittle fracture for low temperatures).

Software and control system

The FULETEST testing software adopts open programming, allowing users to design test standards or edit report formats according to their own needs, generating personalized test reports. The FL measurement system features full digital closed-loop control and multi-channel acquisition capabilities, enabling full digital control of force, deformation, and displacement in three closed loops. It is easy to operate and maintain.

Industry application scenarios

Automotive industry: Verify the brittleness of rubber seals at a low temperature of -40℃, and the tensile strength of interior trims at a high temperature of 80℃.

Electronic appliances: Test the peel strength of PCB boards under high-temperature reflow soldering conditions, or the insertion and extraction force of connectors in cold regions.

Maintenance and safety

Defrosting and drying: After low-temperature testing, be sure to raise the temperature for defrosting to prevent ice formation and damage to the air duct.

Safety interlock: It is recommended to equip with a door-opening shutdown protection function to prevent operators from being burned by high-temperature gas or frostbitten by cold air.

Summary: The high and low temperature universal material testing machine serves as a "touchstone" for material research and development as well as quality inspection. When selecting a model, it is essential to consider the actual service environment of the material, with a focus on temperature control accuracy, fixture adaptability, and operational safety, to ensure that the test data is scientific and effective.