Technique and mechanism for hot spall testing under pressure

Thermal measuring and testing – Flammability testing

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Details

73167, G01L 514, G01N 2500

Patent

active

H00004413

ABSTRACT:
The hot spall tester comprises a tube furnace portion adapted for retaining a magazine portion for containment of a plurality of steel ball bearings which are heated and individually dropped through a feed tube member to a programmed or manually operated carrousel portion having a plurality of sample cups for receiving and containing individual solid propellant samples to be spall tested in accordance with the method. A torque rod is employed to facilitate rotation of the magazine portion and carrousel portion in a vertically aligned relationship with the magazine portion so that the heated steel ball is delivered by gravity through a feed tube to a sample cup of the carrousel portion positioned below the magazine portion. In operation the magazine portion and carrousel portion are aligned and vertically positioned to provide a calculated transit time for the steel ball bearing to drop by gravity to the propellant in the sample cup. Subsequent rotation of the carrousel of about 22.5 degrees positions the cup containing the propellant sample and hot steel ball bearing under a piston having about 0.0001 inch clearance with the carrousel whereby because of its close tolerance, the piston retains the propellant and hot steel ball bearing in a confined pressure relationship during any pressure buildup. For an eight unit capacity of the magazine portion and carrousel portion the sequence can be repeated either manually or automatically eight times to evaluate a solid propellant composition reaction to a hot spall.

REFERENCES:
"Current Spall Tester", (Code Identification No. 18876), US Army Missile mand, Redstone Arsenal, Alabama.

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