Compressive stress relaxation testing device and method of rubber material

Abstract

The invention discloses a compressive stress relaxation testing device and method of a rubber material. The compressive stress relaxation testing device comprises a sample compressing module and a data acquisition module, wherein the sample compressing module is a functional unit for bearing a sample and adjusting and compressing the sample to predetermined compression amount or rate, and the dataacquisition module is a functional unit for acquiring a compressive stress value corresponding to time. The compressive stress relaxation testing method comprises the steps that firstly, the sample is flatly placed on the supporting face of a sample pressing plate fixing end and is compressed to the predetermined compression amount or rate through a rotary pressing plate movement adjusting knob,the compressive stress value corresponding to testing time is acquired, and then data processing is performed to obtain a compressive stress relaxation curve of the sample and stress relaxation ratescorresponding to different service times. The device is simple in structural design and convenient to control actually. The method is a real-time monitoring method, testing results are accurate, the method has no special requirements for sample shapes, only the upper surface and the lower surface need to flush and smooth, the judgment on stress relaxation degree and evolutionary trend is quick, convenient and effective, 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 testing mechanical properties of materials, and in particular relates to a compression 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 sinc...

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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] The Chinese patent literature database discloses Wang Keming's "A Compressive Stress Relaxation Detection Device" (201620536105.3), Li Xinyan, Zhang Xiongsheng, Bu Haoran's "Creep Stress Relaxation Tester" (201330639984.4), Shen Mingxue, Li Xinxin, Peng Xudong, etc. " A Device for High Temperature Creep Test and Stress Relaxation Test of Rubber Elastic Body" (201610649869.8), these devices for testing rubber materials are too complicated in structure, large in size, unable to obtain continuous online experimental data, and difficult to implement in special environments Study on Long-term Properties of Rubber Materials under Controlled Conditions

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