4 - Tube testing at Southern Research Institute. Various gases are used for the working medium from inert to combustion. Normal and shear strain measurements are made. Tube testing at University of Dayton Research Institute. Primarily high temperature tests with internally-pressurized tubes.
Molten glass is used as the working medium.
No strain measurements appear to be made. Primarily room and high temperature tests with longitudinally and torsionally-loaded tubes. Normal and possibly shear strain measurements appear to be made. Various 2-D stress states possible with maximum stresses in axial and off axis directions although maximum stress in the hoop direction is not possible. Thermal and mechanical cycling are also possible.