VQSEC

Blast Tube

  • Blast Tube Configuration

    6-ft Diameter by 120-ft Long Blast Tube Configuration
  • Blast Tube Flow Shot

    Fireball from a 120-ft Blast Tube Flow Shot

The SNL Blast Tube Facility consists of trained, experienced personnel with the ability to design and execute tests using different blast tube configurations with varying lengths and diameters to meet a wide array of customer requirements.

The explosively-driven blast tube facility consists of hundreds of feet of tube sections, ranging from 3 feet to 12 feet, that can be arranged to tailor the blast wave for each specific customer.

The facility is secure and routinely used to perform tests with energetic and hazardous materials, including detonation of explosive charges up to 2,600 lbs. The moderate-hazard facility can support test unit hazards that include some or all of the following:

  • Explosives (including test unit main charges)
  • Radioactive materials
  • Beryllium
  • Fires
  • Rocket motors

SNL’s shock physics codes allow analysts to design the test based on peak pressure, duration, and shape. The explosively-driven blast tube is then configured, based on the simulations, to meet customer requirements. These modeling techniques reduce the amount of calibration shots needed to acquire the correct pressure pulse.

Our mechanical engineering staff designs the required test equipment, and onsite contractors fabricate the required equipment to support test article orientation to acquire the needed loading on each test unit.

The Blast Tube Facility capabilities include proof and modal testing of the fixtures. SNL can provide computational fluid dynamics (CFD) analyses to determine the proper orientation needed to obtain the correct loading on the test units, reducing the number of tests required.

Instrumentation and measurement

Instrumentation and measurement staff support the Blast Tube Facility by installing both high-speed optical and hardwire instrumentation for full-field and point measurements of deformation, elongation, and deflection.

Arming & Firing personnel installing a charge at the 120-ft Blast Tube Facility.
Arming & Firing personnel installing a charge at the 120-ft Blast Tube Facility.

Mobile instrumentation trailers are used to record data at the Blast Tube Facility. Up to 192 channels of data can be supported for a single trailer. Accelerometers, strain, displacement, pressure, and noise gauges can be deployed for use. Multiple instrumentation trailers are available to support addition channels of instrumentation.

Non-contact measurement capabilities are available to support Blast Tube Facility testing, which include the following:

Quantitative High-Speed Imaging

  • Temporal 3D Motion Analysis
  • Position, Velocity, Acceleration
  • Attitude, Rotational Velocity and Acceleration
  • Impact Angle, Angle-of-Attack
  • Full-Field Surface Strain
  • Static and Temporal Deformation
  • Streak Imaging at 10,000,000 frames per second
  • Schlieren Flow Field Measurements and Visualization

Quantitation Thermal and Spectral

  • High-Speed Spectroscopy
  • Thermography
  • Infrared Imaging for temperature fields