Tensile stress relaxation testing device and method of rubber material

Abstract

The invention discloses a tensile stress relaxation testing device and method of a rubber material. The tensile stress relaxation testing device comprises a sample clamping module and a data acquisition module, wherein the sample clamping module is a functional unit for fixing a sample and adjusting and stretching the sample to predetermined elongation, and the data acquisition module is a functional unit for acquiring a tensile stress value corresponding to time. The tensile stress relaxation testing method comprises the steps that firstly, the sample is clamped and fixed to a sample clamp fixing and moving end, the sample is stretched to the predetermined elongation through a rotary clamp movement adjusting knob, the tensile stress value corresponding to testing time is acquired, and then data processing is performed to obtain a tensile stress relaxation curve of the sample and stress relaxation rates corresponding to different service times. The device is simple in structural designand convenient to control actually. The method is a real-time monitoring method, testing results are accurate, the judgment on stress relaxation degree and evolutionary trend is quick, convenient andeffective by adopting the method, and the device and the method are especially suitable for assessment of materials for long-term service.

Description

technical field [0001] The invention belongs to the technical field of material mechanical performance testing, and in particular relates to a tensile stress relaxation testing device and a testing method for rubber materials. Background technique [0002] With the gradual advancement of the construction of the material gene bank from all levels, it is very important to fully understand and master the performance parameters of materials, especially for those advanced functions that are applied in the fields of weaponry, aerospace, energy technology, etc. and require long-term service The stability of materials must be evaluated before they are put into use, so it is of great significance to study the performance effects of materials in specific environments such as long-term tensile / compressive stress loading. In terms of testing principle, the stress test experiment is to test the attenuation of the load (that is, the force on it) under constant deformation, but since the m...

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Problems solved by technology

In terms of testing principle, the stress test experiment is to test the attenuation of the load (that is, the force on it) under constant deformation, but since the measurement of force must be reflected by the deformation of the material, it is necessary to measure both the deformation and the force. This is the difficulty in the design and manufacture of stress relaxation devices

[0003] "A System and Measurement Method for Measuring Stress Relaxation" (201810008595.3) by Zhang Cuiqiang et al., published in China Patent Documentation Database, however, this method is mainly used for testing metal components in the civil engineering field; "New Rubber Tensile Stress Relaxation Test Device" by Zhu Anming (201120228013.6) Although it is used to test rubber materials, the device has a complex structure and a large volume, which is not convenient for testing and verification of large quantities of materials; Relaxation Experimental Device" (201620536105.3) cannot obtain continuous online experimental data, and it is difficult to realize long-term performance research of rubber materials under special environmental control conditions

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