Abstract: An apparatus for cavitation peening is disclosed, including a fluid source, a conduit, and a portable nozzle assembly. The conduit includes a proximal end portion connected to the fluid source and a distal end portion connected to the portable nozzle assembly. The portable nozzle assembly includes an inner nozzle configured to channel a first stream of high-pressure fluid, and an outer nozzle configured to channel a second stream of low-pressure fluid concentrically around the first stream. The inner nozzle includes a cavitation insert having an inner passage with at least two reductions in cross-sectional area.

Abstract: An apparatus includes a component having a shape memory material. The shape memory material has a first shape including a substantially elongate segment. The shape memory material has a second shape including a helix having a first ring and a second ring configured to exert a compressive force on a membrane interleaved between the first ring and the second ring and lying in a plane substantially perpendicular to an axis of the helix, the shape selectable based on an external stimulus.

Abstract: An apparatus includes a component having a shape memory material. The shape memory material has a first shape including a substantially elongate segment. The shape memory material has a second shape including a helix having a first ring and a second ring configured to exert a compressive force on a membrane interleaved between the first ring and the second ring and lying in a plane substantially perpendicular to an axis of the helix, the shape selectable based on an external stimulus.

Abstract: An apparatus includes a component having a shape memory material. The shape memory material has a first shape including a substantially elongate segment. The shape memory material has a second shape including a helix having a first ring and a second ring configured to exert a compressive force on a membrane interleaved between the first ring and the second ring and lying in a plane substantially perpendicular to an axis of the helix, the shape selectable based on an external stimulus.

Abstract: A flexible fixturing apparatus for securely holding and positively locating a workpiece for manufacturing operations. The apparatus includes a two-dimensional pin array comprising parallel pins movably supported on a housing for individual reciprocal axial motion toward contact with a workpiece to be supported. A pin locking mechanism releasably locks the pins of the first pin array against axial motion relative to the housing once the pins have contacted and conformed to the shape of a workpiece. The pin locking mechanism includes a first clamp supported in the housing for reciprocal motion toward and away from the pin array such that panel motion towards the pin array presses the pins of the array against a pin retaining wall of the housing. A second clamp is supported in the housing for reciprocal motion toward and away from the pin array. Motion of the second clamp towards the pin array locks the pins more securely by further crowding the pins.