Device and method for testing pure shear creep property of energetic material

Abstract

The invention provides a device and a method for testing the pure shear creep property of an energetic material, relates to the technical field of energetic material mechanical property tests, in particular to the device and the method for testing the pure shear creep property of the energetic material. The device comprises a testing clamp suite, the testing clamp suite comprises an upper clamp and a lower clamp, and the upper clamp and the lower clamp are connected in a matched mode; an area enclosed by the upper clamp and the lower clamp is a test piece clamping area; the upper clamp comprises an upper clamp body and an upper clamping part fixedly connected with the support frame, one end, far away from the support frame, of the upper clamping part is fixedly connected with the upper clamp body, and the upper clamp body is provided with an upper accommodating opening for fixing one end of a test piece; the device is relatively simple in configuration and structure, can test the shear strength and the creep property of various energetic materials such as solid propellants and explosives under pure shear loading, breaks through the limitation that the existing energetic material pure shear creep property test method is insufficient, and can meet the requirement of long-time stable and reliable test.

Description

technical field [0001] The invention relates to the technical field of mechanical performance testing of energetic materials, in particular to the pure shear creep performance testing of solid propellants, explosives and other energetic materials with viscoelastic properties, and is suitable for performance analysis and constitutive relations of such materials. The invention relates to the establishment and analysis of the structural integrity of the fabricated grain column and other structures when creep deformation occurs, and in particular relates to a device and method for testing the pure shear creep performance of energetic materials. Background technique [0002] The mechanical properties of energetic materials such as solid propellants and explosives have obvious time and temperature dependence, that is, they exhibit thermoviscoelastic properties, and are affected by factors such as stress, strain state, and environmental humidity. One of the two main properties of a...

AI Technical Summary

Problems solved by technology

In addition to the fact that the above research methods do not fully match the stress state of pure shear loading, there are also test methods that are difficult to apply to the shear creep performance test requirements of energetic materials such as solid propellants and explosives.

It is mainly reflected in the following points: First, the modulus and strength of energetic materials such as solid propellants and explosives are small, and it is difficult for creep testing machines sold in the market to take into account continuous and reliable work under long-term loading and small stress level loading at the same time ;Secondly, special fixtures are required to carry out mechanical performance tests of energetic materials such as solid propellants and explosives, because they cannot be directly punched or clamped with testing machines like metal materials, rubber and other non-metallic materials. Third, the effect of temperature and humidity on energetic materials such as solid propellants and explosives is far greater than that of non-metallic materials such as metal materials and rubber. Therefore, effective temperature and humidity control methods must be adopted during the test; Fourth, the method of measuring deformation by extensometer is likely to bring additional local deformation to low-strength energetic materials such as solid propellants and explosives during long-term loading, which will affect the test accuracy and even lead to early failure of these materials

[0004] To sum up, there is currently a lack of test devices and test methods for effectively testing the pure shear creep properties of energetic materials such as solid propellants and explosives. The structural integrity of the structure under storage conditions is of great significance for the ultimate evaluation of the reliability of solid rocket motors

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