Compact hollow cylinder tensile tester

William Buttlar (Inventor), Tom Brovold (Inventor), Jim Adams (Inventor)

Research output: Patent


A hollow cylindrical tester uses an inflatable membrane to apply hoop stress to a hollow cylindrical sample. The compact device includes a frame that holds a sample around the inflatable membrane. The membrane is preferably inflated via fluid pressure and the fluid pressure preferably is monitored to determined pressure at critical points in testing procedures. Pressures of fluids within the membrane are also monitored. In a preferred structure, a piston and cylinder pressure injector operatively connected to the membrane is monitored for amount of piston travel and a pressure meter monitors fluid pressure. The preferred structure includes shaped opposing platens to seal the membrane within a cylinder sample being tested, a post failure restraint cylinder, and a cooling fluid bath.
Original languageEnglish (US)
U.S. patent number6595068
Filing date2/22/01
StatePublished - Jul 22 2003


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