SIMLab

Shock Tube Facility

The SIMLab Shock Tube Facility (SSTF) consists of a long tube and a tank. The tube is 18.2 m long and is divided into six sections. The tube ends in a 5.1 m3 dump tank. The tube starts with a circular internal cross-section with a diameter of 0.34 m before it is transformed to a square cross-section of 0.3 m x 0.3 m. Threaded holes in the tube floor enable mounting of test specimens in the test section, and windows in the test section and the dump tank allow high-speed cameras to investigate the structural response during an experiment. 

The high-pressure chamber, the driver section, generates a uniform shock wave propagating down the tube under controlled conditions by a rapid release of compressed gas. The facility is designed to release pressures as high as 170 bar resulting in an incident shock wave with a Mach number of 2.6. The compressed gas is released by a triple diaphragm system resulting in a controlled and instantaneous burst of the diaphragms, and aluminium inerts may be used to vary the volume of the compressed gas.

Piezoelectric pressure sensors (Kistler 603B) with charge amplifiers (Kistler 5064) and data acquisition system from National Instruments (NI USB-6356) are used to measure the pressure at various locations downstream the diaphragms.

View from the test section down along the tube. Photo: Øyvind Buljo, NTNU

The windows in the test section allow video recording with high speed cameras from various angles. Photo: Øyvind Buljo, NTNU

Test specimens can be mounted on the end of the tube in the dump tank. Photo: Øyvin Buljo, NTNU