Thermal vibration combined test method for high-temperature-resistant polyimide composite gas cylinder

Abstract

The invention discloses a thermal vibration combined test method for a high-temperature-resistant polyimide composite gas cylinder, which comprises the following steps: fitting a working pressure curve of the gas cylinder according to a time axis based on the use environment temperature of the gas cylinder to obtain a data curve corresponding to the environment temperature and the pressure of the gas cylinder, and selecting at least three coordinate points (X, Y) on the curve, secondly, converting thermal vibration test conditions into test piece gas high-temperature state design points, and testing the coordinate points (X1, Y) of the internal gas temperature of the empty bottle corresponding to the three coordinate points in the first step through an external heating test of the empty bottle; substituting (X1, Y) into the non-ideal gas state equation, and obtaining the pressure value Y1 at the normal temperature; and introducing gas at room temperature to reach (X0, Y1), controlling the environment temperature to reach X, controlling the internal temperature of the gas cylinder to reach X1, and starting a vibration test. The invention provides a test design scheme which is easier to operate and higher in reliability, and can be widely applied to formulation of thermal vibration combined test schemes of high-temperature-resistant pressure containers such as missile weapons and records.

Description

technical field [0001] The invention relates to a heat-vibration combined test method for a high-temperature-resistant polyimide composite gas cylinder. Background technique [0002] As the flight Mach number of missiles and aircraft continues to increase, the improvement of the flight aerodynamic heating effect puts forward higher requirements for the aerodynamic shape design of missiles and aircraft, structural thermal protection design and high temperature resistance design of mounted equipment. As an important part of the power system of the missile, the gas cylinder provides a gas source for the air supply. The gas cylinder is affected by the combined effects of thermodynamics and vibration environment during the flight of the missile or aircraft. Because the high-pressure gas grows inside the gas cylinder, the high-temperature condition will cause the gas to expand when heated, and the gas cylinder itself will also be affected by the thermal stress of the high-pressure...

AI Technical Summary

Problems solved by technology

[0004] The technical problem solved by the present invention is to provide a heat-vibration joint test method for polyimide composite material gas cylinders with high temperature resistance, which can solve the problem of polyimide composite material gas cylinders under working pressure at the best operating temperature of 400 °C. The problem of the mismatch between the transient point and the thermal shock test time

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