title: Electrohydraulic fatigue apparatus for testing at cryogenic temperature.
abstract: A closed-loop electrohydraulic fatigue apparatus was constructed for testing from above room temperature to 77 K. Several important improvements in the electronics of the reference function generator and the servo controller over previous apparatus are described. The electronics allows cool-down of the specimen to 77 K at zero stress, correction for thermal contraction, and then cyclic fatigue testing under strain control, all without interruption of hydraulic power.
authors.affiliation: Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60201Department of Chemistry, Northwestern University, Evanston, Illinois 60201.
authors.forename: P K
authors.initials: PK
authors.lastname: Liaw
authors.forename: J
authors.initials: J
authors.lastname: Baker