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Method for assessing advantages and disadvantages of low-temperature mechanical properties of viscoelastic material

An evaluation method, viscoelastic technology, applied in the direction of applying stable tension/pressure to test the strength of materials, etc., can solve the problems of not being able to quantitatively predict the low-temperature mechanical properties of materials and increase the cost of measurement

Active Publication Date: 2016-03-30
HUBEI INST OF AEROSPACE CHEMOTECHNOLOGY
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Problems solved by technology

However, this patent requires the design of a special measuring device for cooperation, which greatly increases the cost of measurement, and there is also the problem that the low-temperature mechanical properties of the material cannot be quantitatively predicted

Method used

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  • Method for assessing advantages and disadvantages of low-temperature mechanical properties of viscoelastic material
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  • Method for assessing advantages and disadvantages of low-temperature mechanical properties of viscoelastic material

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Embodiment Construction

[0024] In order to better understand the present invention, the content of the present invention will be further clarified below in conjunction with specific embodiments and accompanying drawings, but the content of the present invention is not limited to the following examples.

[0025] The solid propellant of a certain formula is made into a dumbbell-shaped specimen, and the stress-strain test is carried out according to the temperature and tensile rate set in Table 1, and the tensile strength data obtained from the test are filled in Table 1.

[0026] The test data in Table 1 and Table 2 are processed with the mathematical model of formula (1).

[0027] σ m = σ m c · ( 1 T ) α T · R ...

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Abstract

The invention relates to a method for assessing the advantages and disadvantages of low-temperature mechanical properties of a viscoelastic material. According to the method, through uniaxial tension mechanical property tests under the different temperature conditions and within a relatively wide range of strain rates, a principal curve assessing method for the low-temperature mechanical properties of viscoelastic materials in different systems and a mathematical model of which the tensile strength is impacted by the temperature and strain rates are constructed, and then the advantages and disadvantages of the low-temperature mechanical properties of the viscoelastic material can be assessed by adopting a tensile strength temperature sensitivity index and a strain rate sensitivity index. Compared with the conventional method, the method provided by the invention has the advantages that the low-temperature mechanical properties of the viscoelastic material can be quantitatively forecasted, and the advantages and disadvantages of uniaxial tension mechanical properties of the viscoelastic material can be quantitatively assessed.

Description

technical field [0001] The invention belongs to the technical field of material mechanical performance testing, and in particular relates to a method for evaluating the low-temperature mechanical performance of viscoelastic materials, which is used for evaluating the mechanical performance of solid propellants or other viscoelastic materials. Background technique [0002] With the continuous expansion of solid propellant application fields and the diversification of tasks, the operating temperature of solid rocket motors is getting lower and lower, and they are facing increasing risks brought about by low-temperature extreme environments, which makes people pay more attention to the low-temperature performance of solid rocket motors . Low temperature will not only affect the internal ballistic performance of the solid rocket motor, but also significantly affect the mechanical properties of the propellant, leading to serious accidents such as ignition and explosion of the eng...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/18
CPCG01N3/18
Inventor 何铁山李磊王宁杜芳姚南胡建江吴世曦
Owner HUBEI INST OF AEROSPACE CHEMOTECHNOLOGY
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