Device and method for testing bonding strength of composite pipe under hot loading condition

Abstract

The invention relates to a device and method for testing the bonding strength of a composite pipe under the hot loading condition and belongs to the technical field of testing the bonding strength performance of a composite pipe. The device comprises a high-strength pressure-bearing frame, a pressure system, a heating and heat preservation box and an adjustable support. The pressure system is fixed in the high-strength pressure-bearing frame; a variable-diameter pressure head is inserted into the heating and heat preservation box; a composite pipe to be tested is placed on the variable-diameter pressure head; the upper end surface of the variable-diameter pressure head only makes contact with the lower end surface of an inner pipe of the composite pipe to be tested, and the height of the heating and heat preservation box body is basically flush with the upper end surface of a test pipe section; a heating and heat preservation box upper cover is covered to make the heating and heat preservation box upper cover contacted with the high-strength frame and the lower surface of the heating and heat preservation box upper cover only contacted with the upper end surface of an outer pipe ofthe composite pipe to be tested; a power source of the heating and heat preservation box is turned on to carry out heating till reaching a required test temperature, and the temperature is maintainedwhen the temperature is stable; pressure is loaded and change of pressure is observed; and when the pressure reaches the maximum and begins to drop significantly, it is indicated that shear failure has occurred to the composite pipe, and the pressure value in the process is recorded.

Description

technical field [0001] The invention relates to the technical field of composite pipe bonding strength performance testing, in particular to a device and method for testing the bonding strength of composite pipes under thermal loading conditions. Background technique [0002] The composite pipe is a composite pipe with a double-layer or multi-layer structure composed of two or more materials with different properties. In engineering applications, the material system and production process of the composite pipe can be selected according to the application environment and the performance requirements of the pipe. The selection and design can maximize the complementary advantages of materials. On the basis of ensuring the basic performance of the pipeline, it can improve the corrosion resistance of the pipeline, prolong the service life of the pipeline, and reduce the engineering cost. It can often replace pure stainless steel pipes, copper pipes or Other expensive alloy tubes....

AI Technical Summary

Problems solved by technology

These standards all require the bonding strength of composite pipes at room temperature, ignoring the influence of temperature on the bonding strength of composite pipes composed of material systems with different thermal expansion coefficients, which have problems in guiding the application of composite pipes under thermal loading conditions. Insufficient, easy to cause production accidents and safety hazards

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