Method for estimating low-temperature mechanical properties of PBT propellant based on contact angle data and formula

A contact angle and propellant technology, applied in the field of solid propellants, can solve problems such as danger, long cycle, time required and high economic cost

Active Publication Date: 2019-06-28
NAT UNIV OF DEFENSE TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of test methods to test mechanical properties has the advantage of reliable results, but the test period is long and the cost is high, especially for high and low temperature tests, which require more precise control of test condi

Method used

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  • Method for estimating low-temperature mechanical properties of PBT propellant based on contact angle data and formula
  • Method for estimating low-temperature mechanical properties of PBT propellant based on contact angle data and formula
  • Method for estimating low-temperature mechanical properties of PBT propellant based on contact angle data and formula

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] (1) Contact angle test of PBT propellant filler and matrix

[0058] The SL200B contact angle measuring instrument was used to measure the contact angles of different reference solutions on the sample surface. The reference solution includes tricresyl phosphate, distilled water, glycerin, formamide, ethylene glycol, α-bromonaphthalene, etc. The samples include the main fillers (AP, HMX and Al) in the PBT propellant and the PBT matrix. The contact angles of different reference solutions on the main components of PBT propellants are shown in Table 1.

[0059] Table 1 The contact angles of different reference solutions on the main components of PBT propellants

[0060]

[0061] (2) Adhesion work of main filler-PBT matrix interface in PBT propellant

[0062] According to the contact angle test results of the PBT propellant filler and the matrix in Example (1), the surface tensions of AP, HMX, Al, and PBT matrix were calculated using formulas (3) to (7). The results are...

Embodiment 2

[0074] Embodiment 2 contact angle test method

[0075] Commonly used contact angle testing methods include Whilemy hanging method, dynamic capillary method, static drop method, etc. The contact angle method has the advantages of simple operation and accurate experimental results (the error of the two measurement results is not more than ±1).

[0076]The present invention adopts the static drop method to test the contact angle of the reference liquid on the surface of the propellant main component. The volume was set at 1 μL. After the titration liquid is in contact with the solid surface to be tested to form a lying drop, lift the liquid injection needle. After the contact angle of the liquid on the solid surface is stabilized, a microscopic image is obtained and the contact angle is measured. The arc tangent method was selected as the contact angle measurement method. The arc tangent method is the most direct angle measurement method.

[0077] The contact angles of diffe...

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Abstract

The invention provides a method for estimating the low-temperature mechanical properties of a PBT propellant based on contact angle data and a formula. The method includes the steps that according tothe contact angle test results of a reference solution on the surfaces of a PBT propellant filler and a substrate, interface characteristic parameters such as the adhesion work of a filler-substrate interface are calculated; based on the interface characteristic parameters, in cooperation with formula parameters of the propellant, the volume fraction of the filler, the adhesion work and the like are taken as input parameters, and the mechanical properties of the composite solid propellant is further estimated. The method is applied to the field of composite solid propellants; rapid estimationof the mechanical properties of the solid propellant can be reliably achieved, the experiment cost can be effectively reduced, the cycle can be shortened, and the testing safety can be improved.

Description

technical field [0001] The present invention generally relates to the technical field of solid propellants, in particular to a method for estimating low-temperature mechanical properties of PBT composite solid propellants. Background technique [0002] Modern high-tech warfare puts forward high requirements on the penetration capability and survivability of missiles. Increasing range, increasing flight speed, improving maneuverability and enhancing concealment are the development directions of missiles, which makes the composite solid propulsion in rocket engines The propellant grain bears more severe mechanical loads, which puts forward higher requirements on the mechanical properties of composite solid propellants. [0003] From the perspective of material system, composite solid propellant is a particle-reinforced polymer-based composite material, and its continuous phase, that is, the elastic matrix is ​​composed of cured binder and plasticizer, solid fillers such as oxi...

Claims

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Application Information

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IPC IPC(8): C06B33/06C06D5/06G16C20/30G16C20/90
Inventor 周星鲍桐张炜邓蕾干效东张惠坤徐亚龙
Owner NAT UNIV OF DEFENSE TECH
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