In-situ testing apparatus and method for complex mechanical properties of solid propellants under scanning electron microscopy

By developing an in-situ testing device for the complex mechanical properties of solid propellants suitable for scanning electron microscopy, the problems of insufficient loading stroke and low temperature loading efficiency of existing devices have been solved. This device enables effective clamping and multi-dimensional analysis of solid propellants under high strain rates, revealing their deformation and damage mechanisms under complex loads, and improving propellant performance and engine reliability.

CN117288984BActive Publication Date: 2026-06-30JILIN UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
JILIN UNIVERSITY
Filing Date
2023-09-28
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing in-situ mechanical property testing devices under scanning electron microscopes are not suitable for solid propellants. They suffer from problems such as insufficient loading stroke, large mechanical load testing errors, poor sample clamping effect, and low temperature loading efficiency, making it impossible to effectively study the deformation and damage behavior of solid propellants under complex loads.

Method used

An in-situ testing device for the complex mechanical properties of solid propellants under scanning electron microscopy has been developed. The device includes a scanning electron microscope, a support unit, a fatigue loading unit, a flexible pre-tightening clamp unit, a cross-temperature loading unit, and a data acquisition and processing unit. It can effectively clamp the propellant under high strain rates and, combined with the high-resolution analysis of the scanning electron microscope, perform multi-dimensional quantitative analysis of the microscopic deformation and damage of the propellant.

Benefits of technology

This study enables high-frequency fatigue and cross-temperature load application of solid propellants under scanning electron microscopy, providing multi-dimensional analysis of microscopic deformation, damage, and failure behavior, and offering technical support for propellant formulation improvement and engine reliability enhancement.

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Abstract

This invention discloses an in-situ testing device and method for the complex mechanical properties of solid propellants under scanning electron microscopy. It includes a transmission unit, a support unit, a load measurement unit, a fatigue loading unit, a flexible pre-tightening clamp unit, a cross-temperature loading unit, a data acquisition and processing unit, and a multi-load loading control system. The fatigue loading unit utilizes a voice coil motor to achieve millimeter-level large-stroke fatigue loading while the sample is being stretched. The flexible pre-tightening clamp unit uses spring deformation to compensate for propellant sample deformation and maintains stable clamping, and is used in conjunction with the cross-temperature loading unit to apply a variable temperature environment of -80℃ to 100℃ to the sample. The advantage of this invention lies in utilizing the high depth of field and high resolution of the scanning electron microscope to obtain in-situ multi-scale mechanical behavior of propellants under the coupled effects of tension, fatigue, and temperature, and to construct the multi-scale deformation-damage structure-property relationship of propellants under complex loads, providing an important technical means for the research of novel propellants.
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