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Forest Products Laboratory
One Gifford Pinchot Drive
Madison, WI 53726-2398
Phone: (608) 231-9200
Fax: (608) 231-9592


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Requested Product

Title: Recursive Hexapod System and Method for Multiaxial Mechanical Testing

Source: U.S. Patent 8,978,480 B2. March 17, 2015. 20 p. Int. Classif. G01N 3/02.

Author(s)Michopoulos, John; Hermanson, John; Illopoulos, Athanasios

Publication Year: 2015  View Document »

Category: Patents

Abstract: A recursive hexapod testing machine for mechanical testing of deformable material specimens under six degrees of freedom multiaxial loading. The machine includes a fixed base, a movable base connected to the fixed base at by a hexapod arrangement of six linearly extendable actuator linkages, with an end of each linkages attached to the movable base and the other end of the linkage attached to the fixed base. Each actuator linkage includes a hydraulic cylinder and piston, a digitally-controlled electro-hydraulic servo-valve for actuating the hydraulic cylinder in response to a digital command string, a load cell in line between the piston and the universal joint attached to the movable base, a linear variable displacement transducer for measuring extension of the piston, and a magneto-resistive position transducer for measuring a position of the piston. The servo-valves extend each hydraulic cylinder a predetermined amount to effect a desired motion of the material specimen.

Keywords: recursive hexapod; mechanical testing; hydraulic; multiaxial; piston; magneto-resistive; transducer

Date posted: 05/13/2015
RITS Product ID: 72803
Current FPL Scientist associated with this product
Hermanson, John C.
Research General Engineer

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