Method for rapidly detecting main curve of tensile strength for unidirectional stretching of solid propellant
A solid propellant, unidirectional stretching technology, applied in the direction of applying stable tension/pressure to test the strength of materials, can solve the problems that do not involve the estimation of the main curve of tensile strength of static mechanical parameters, etc., to achieve strong practicability, Simple calculation method and cost-saving effect
Active Publication Date: 2013-07-24
HUBEI INST OF AEROSPACE CHEMOTECH
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[0007] The above literatures have explored the relationship between the main curve of dynamic storage modulus and the main curve of stress relaxation modulus, but none of them i
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[0059] Example 1: The solid propellant sample is taken from a solid propellant billet.
[0060] Step 1: Analyze the relationship between the dynamic storage modulus and the set dynamic frequency. Using a dynamic mechanics analyzer, measure the storage modulus E'(ω) of a series of set temperatures and set dynamic frequencies of solid propellant samples. According to the principle of time-temperature equivalence, the reference temperature T is obtained by superposition s Under the main curve of storage modulus, obtain the relationship curve of E'(ω)-ω, figure 1 That is, the solid propellant obtained by the dynamic mechanical analyzer is at the set temperature T s =20℃ dynamic storage modulus E'(ω) master curve; and get the shift factor lgα at different set temperatures t Value, for example, when the set temperature is 0℃, lgα t =1.09.
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The invention relates to a method for rapidly and quantitatively evaluating spaceflight fuel performances, and relates to a method for rapidly detecting a main curve of tensile strength for unidirectional stretching of a solid propellant. The method comprises eight steps of: analyzing a relation between a dynamic energy storage modulus and a setting, calculating a relation between a stress relax modulus and a setting temperature, drafting a difference graph of a main curve of the dynamic energy storage modulus to a main curve of the stress relax modulus, detecting tensile strength of unidirectional stretching, obtaining a dynamic frequency value, obtaining a dynamic energy storage modulus value, obtaining a tensile strength value of unidirectional stretching, and drafting a main curve map of tensile strength of unidirectional stretching. By detecting the main curve of the dynamic energy storage modulus and the main curve of the stress relax modulus of the solid propellant, and based on a relative formula, the dynamic tensile strength value and the main curve of the tensile strength of the unidirectional stretching are obtained at any temperature and any stretching speed. The method is widely used for rapidly detecting fuel performances of the solid propellant, and has advantages of short detection process, low consumption sample, low test cost and good data repeatability.
Description
Technical field [0001] The invention belongs to a method for fast quantitative evaluation of fuel properties for aerospace, which utilizes the main curve of dynamic storage modulus of solid propellant to calculate the main curve of unidirectional tensile strength, in particular to a kind of unidirectional tensile strength of solid propellant A fast detection method for the master curve. Background technique [0002] In the field of aerospace engines, in order to analyze the structural integrity of solid propellants, it is necessary to obtain static mechanical parameters such as the main curve of stress relaxation modulus and the main curve of unidirectional tensile tensile strength of the solid propellant. It is a static mechanical analysis method, which is realized by using a large-scale material testing machine. This testing process has the defects of time-consuming, sample consumption and high testing cost. However, the dynamic mechanical analysis method has the advantag...
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Inventor 王小英尹欣梅汪越代志龙宋会彬潘新洲王彦
Owner HUBEI INST OF AEROSPACE CHEMOTECH
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