Detonation sphere. Quarterly report, April--June, 1971

The final HE test for the fiscal year was conducted in the 4-foot detonation sphere in May. A 200 g charge of 2-4-6 trinitrotoluene (1 1/2-inch diameter x 4 1/2-inch long) was initiated. On initiation, the TNT charge failed to detonate but instead partial deflagration of the HE took place. The ensuing pressure rise (54 torr vs. {approximately} 120 torr expected) implied a partial detonation; nevertheless, sampling and evaluation at the detonation products was continued. After removal of the products, the sphere was opened for inspection. The interior of the sphere was covered with a heavy carbon deposit adhering to a viscous film. Closer observation revealed granules of TNT embedded in the residual layer and also smeared on the surfaces of the involved hardware. Scrubbing with soap and water had no effect on the film; consequently, all the contamination was removed with acetone. Of the related hardware, only the copper cylinder suffered any damage. The cylinder was not fragmented; however, the internal diameter (1 1/2-inch) was found to have been enlarged by {le} 0.450 inch. The partitioned stainless steel tube suffered no distortion although the sections were propelled against the sphere wall. The data obtained for this test along with the test conditions are listed