Portable variable expansion testing device

摘要

The present invention is a portable testing device for directly measuring developed lateral pressure and displacement induced on a material by a vertically applied load. The testing device comprises a thin walled cylindrical sleeve-like receptacle which is capable of lateral expansion in response to a vertically applied force on the material contained in the receptacle. A pressure sensing cylinder engages the expandable receptacle wall and has a stress gauge operatively connected thereto for sensing the pressure within the sensing cylinder. A strain gauge is also connected to the sensing piston for registering lateral displacement thereof. The improvement on this device comprises a control cylinder for regulating the pressure within the sensing cylinder. The control cylinder includes a control piston and threaded screw for adjustment of the control piston position within the control cylinder. The control cylinder is in fluid communication with the sensing cylinder and with the stress gauge.