Mr. Ryan M. Hahnlen Profile

Ryan M. Hahnlen

at Ohio State Univ

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Author

Publications (4)

Proceedings Article | 28 March 2012 Paper

Stress-induced tuning of ultrasonic additive manufacturing Al-NiTi composites

Ryan Hahnlen, Marcelo Dapino

Proceedings Volume 8342, 83421J (2012) https://doi.org/10.1117/12.915582

KEYWORDS: Composites, Aluminum, Solids, Shape memory alloys, Thermal modeling, Ultrasonics, Additive manufacturing, Metals, Temperature metrology, Atrial fibrillation

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Proceedings Article | 30 April 2011 Paper

Performance and modeling of active metal-matrix composites manufactured by ultrasonic additive manufacturing

Ryan Hahnlen, Marcelo Dapino

Proceedings Volume 7979, 797903 (2011) https://doi.org/10.1117/12.881152

KEYWORDS: Composites, Aluminum, Ferroelectric polymers, Additive manufacturing, Ultrasonics, Temperature metrology, Metals, Magnetism, Smart materials, Atrial fibrillation

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Proceedings Article | 29 March 2010 Paper

Active metal-matrix composites with embedded smart materials by ultrasonic additive manufacturing

Ryan Hahnlen, Marcelo Dapino

Proceedings Volume 7645, 76450O (2010) https://doi.org/10.1117/12.848853

KEYWORDS: Composites, Aluminum, Ultrasonics, Dielectrics, Additive manufacturing, Sensors, Metals, Smart materials, Ferroelectric polymers, Magnetism

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Proceedings Article | 1 April 2009 Paper

Aluminum-matrix composites with embedded Ni-Ti wires by ultrasonic consolidation

Ryan Hahnlen, Marcelo Dapino, Matt Short, Karl Graff

Proceedings Volume 7290, 729009 (2009) https://doi.org/10.1117/12.817036

KEYWORDS: Composites, Aluminum, Ultrasonics, Resistance, Metals, Temperature metrology, Additive manufacturing, Interfaces, Sensors, Optical fibers

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[Smart Vehicle Workshop] This paper presents the development of active aluminum-matrix composites manufactured by Ultrasonic Additive Manufacturing (UAM), an emerging rapid prototyping process based on ultrasonic metal welding. Composites created through UAM experience process temperatures as low as 20°C, in contrast to current metal-matrix fabrication processes which require fusion of materials and hence reach temperatures of 500°C and above. UAM thus creates unprecedented opportunities to develop adaptive structures with seamlessly embedded smart materials and electronic components without degrading the properties that make embedding these materials and components attractive. This research focuses on three aspects of developing UAM Ni-Ti/Al composites which have not been accomplished before: (i) Characterization of the mechanical properties of the composite matrix; (ii) Investigation of Ni-Ti/Al composites as tunable stiffness materials and as strain sensors based on the shape memory effect; and (iii) Development of constitutive models for UAM Ni-Ti/Al composites. The mechanical characterization shows an increase in tensile strength of aluminum UAM builds over the parent material (Al 3003-H18), likely due to grain refinement caused by the UAM process. We demonstrate the ability to embed Ni-Ti wires up to 203 μm in diameter in an aluminum matrix, compared with only 100 μm in previous studies. The resulting Ni-Ti/Al UAM composites have cross sectional area ratios of up to 13.4% Ni-Ti. These composites exhibit a change in stiffness of 6% and a resistivity change of -3% when the Ni- Ti wires undergo martensite to austenite transformation. The Ni-Ti area ratios and associated strength of the shape memory effect are expected to increase as the UAM process becomes better understood and is perfected. The Brinson constitutive model for shape memory transformations is used to describe the stiffness and the strain sensing of Ni-Ti/Al composites in response to temperature changes.

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