Aging test method and apparatus under wet, heat and power multiple-field coupling

Abstract

The invention relates to an aging test method and an aging test device under the multi-field coupling of humidity, heat and force. The method is used for testing polymer materials and test specimens produced by composite materials of the polymer materials, and the test is based on the dynamic monitoring to the tensile creep compliance of the materials under the multi-field coupling of the humidity, the heat and the force. The device is based on a standard humid and hot environmental box controlled by a microcomputer, a test specimen clamping and loading mechanism is arranged in a box of the device, and an electronic extensometer and a laser extensometer are arranged to form a double displacement sensor and are connected to the microcomputer through an acquisition device after the data acquisition. The method and the device have the advantages of accurate and convenient test and low cost, and are suitable for the research of viscous-elastic mechanical properties and aging performances under the operation of polymers and composite materials of the polymers.

Description

technical field [0001] The invention relates to an aging test method and a device thereof under the coupling of multiple fields of humidity, heat and force, which are mainly used for simulating the aging performance test of polymers and their composite materials in an in-service environment, belonging to the field of material mechanics testing machines. Background technique [0002] When high molecular polymers and their composite materials are used in a hot and humid environment, the performance of the materials will gradually decrease, and some or all of their use value will be lost and aging will occur. The mechanism of moisture, heat and force coupling aging is mainly as follows: ①The thermal stress damage originates from the change of ambient temperature and the different damage degrees of resin matrix, reinforcing fiber and resin-fiber bonding interface; ②The influence of water molecule diffusion movement on the material It is the weakening or even destruction of physi...

AI Technical Summary

Problems solved by technology

So far, there is no material aging test method and equipment under the coupling of humidity, heat and force. At present, the damp heat aging test of polymers and their composite materials is carried out by "two-step method", that is, the damp heat aging is determined according to the use environment of the material. After the artificial accelerated aging test was carried out for a certain period of time in the hot and humid environmental chamber, the samples were taken out from the environmental chamber, and analyzed by scanning electron microscopy (SEM), X-ray diffraction (XRD), and electron spectroscopy (XPS). ) and infrared spectrogram analysis (FTIR) and other micro-materials methods or the use of general-purpose testing machines for material mechanics to test the changes in the macroscopic mechanical parameters of materials during the aging process

For most polymers and their composites whose actual service conditions are humidity, heat, and force coupling, monitoring the aging process according to the above-mentioned "two-step method" will significantly overestimate the aging resistance of the material, resulting in engineering design security risks

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