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Solid propellant viscoelasticity poisson ratio-strain rate principal curve construction method

A technology of solid propellant and construction method, applied in the direction of applying stable tension/pressure to test the strength of materials, etc., can solve the problems of high accuracy and small error, and achieve the effect of high accuracy, high authenticity, and clear process

Active Publication Date: 2019-06-18
NAT UNIV OF DEFENSE TECH
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AI Technical Summary

Problems solved by technology

[0004] The invention provides a method for constructing the main curve of the viscoelastic Poisson's ratio strain rate of a solid propellant, which is used to overcome the defects in the prior art that the additional stiffness in the measurement process affects the Poisson's ratio measurement results, and to achieve different target temperatures Non-contact measurement of viscoelastic Poisson's ratio of solid propellants at different target stretching rates with low error and high accuracy

Method used

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  • Solid propellant viscoelasticity poisson ratio-strain rate principal curve construction method
  • Solid propellant viscoelasticity poisson ratio-strain rate principal curve construction method
  • Solid propellant viscoelasticity poisson ratio-strain rate principal curve construction method

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Embodiment 1

[0023] Please refer to figure 1 , the invention provides a method for constructing a solid propellant viscoelastic Poisson's ratio strain rate master curve, comprising the following steps:

[0024] First, according to the DIC test principle, build a non-contact high-precision solid propellant viscoelastic Poisson's ratio measurement system; according to the DIC test principle, build a non-contact high-precision solid propellant viscoelastic Poisson's ratio measurement system The high-precision test system can obtain high-quality digital images and realize high-precision measurement of the viscoelastic Poisson's ratio of solid propellants. The high and low temperature test chamber and the microcomputer-controlled electronic universal testing machine are respectively used to provide the temperature and loading environment required for the test, and the bi-telecentric lens and high-resolution camera realize the image collection of the sample. Lens and camera are the key equipmen...

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Abstract

The invention discloses a solid propellant viscoelasticity poisson ratio-strain rate principal curve construction method. The construction method comprises eight steps of designing a unidirectional constant speed tensile test scheme; collecting surface information; calculating a solid propellant viscoelasticity poisson ratio; drawing an isothermal curve family; calculating a translation amount; outputting a solid propellant viscoelasticity poisson ratio strain rate principal curve data point; and fitting a solid propellant viscoelasticity poisson ratio strain rate principal curve and the like.Compared with the prior art, by using the solid propellant viscoelasticity poisson ratio-strain rate principal curve construction method, non-contact measurement of solid propellant viscoelasticity poisson at different target temperature points and different target tensile rates is realized, an influence of additional stiffness during a measurement process on a poisson ratio measurement result isavoided, an error is small and accuracy is high.

Description

technical field [0001] The invention relates to the technical field of solid motors, in particular to a method for constructing a solid propellant viscoelastic Poisson's ratio strain rate master curve. Background technique [0002] Solid propellants are typical viscoelastic materials, and their viscoelastic Poisson's ratio is an important input parameter for structural integrity analysis of solid motors. When analyzing the structural integrity of solid motor grains, only when the Poisson’s ratio of the propellant is known can the correct calculation of the stress and strain generated inside the grains in a certain state, and then according to the failure criterion Assess whether damage has occurred in the corresponding state. Due to the viscoelastic properties of propellant, its Poisson's ratio is actually a viscoelastic material parameter closely related to time, temperature and loading rate. [0003] At present, the measurement methods for the viscoelastic Poisson's rati...

Claims

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Application Information

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IPC IPC(8): G01N3/18
Inventor 申志彬吕轩郭宇崔辉如李奕飞
Owner NAT UNIV OF DEFENSE TECH
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