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Andrew G. Littlefield
Researcher at United States Department of the Army
Publications - 33
Citations - 173
Andrew G. Littlefield is an academic researcher from United States Department of the Army. The author has contributed to research in topics: Finite element method & Advanced composite materials. The author has an hindex of 7, co-authored 32 publications receiving 126 citations. Previous affiliations of Andrew G. Littlefield include United States Army Armament Research, Development and Engineering Center & Rensselaer Polytechnic Institute.
Papers
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Journal ArticleDOI
Improvement in fatigue life of carbon fibre reinforced polymer composites via a Nano-Silica Modified Matrix
Mithil Kamble,Aniruddha S. Lakhnot,Stephen F. Bartolucci,Andrew G. Littlefield,Catalin R. Picu,Nikhil Koratkar +5 more
TL;DR: In this paper, a nano-modified carbon fiber reinforced polymer (nanoCFRP) with 6-7 fold higher fatigue life in the high cycle fatigue regime has been proposed, and the mechanism for the observed performance improvement is the ability of nano-silica to disrupt and prolong the propagation process of incipient cracks.
Journal ArticleDOI
Carbon Fiber/Thermoplastic Overwrapped Gun Tube
Andrew G. Littlefield,Edward J. Hyland,Andrew Andalora,Nathaniel Klein,Robert J. Langone,Robert D. Becker +5 more
TL;DR: In this article, a 120 mm barrel has been manufactured using this process with IM7 fibers in a polyetheretherketone matrix and successfully test fired using a thermoplastic resin and a cure on the fly process, the manufacturability of the barrels has greatly improved and the gap has been eliminated.
Patent
Self powering prognostic gun tag
TL;DR: In this article, an apparatus for counting and storing a number of rounds fired from a gun includes a microcomputer, a nonvolatile memory connected to the microcomputer; and at least one piezoelectric transducer, comprising a power source that generates power during operation of the gun.
Journal ArticleDOI
120 mm Prestressed Carbon Fiber/Thermoplastic Overwrapped Gun Tubes
TL;DR: In this article, the authors used a thermoplastic resin, a cure-on-the-fly process, and winding under tension to improve the manufacturability of the 120mm barrels.
Journal ArticleDOI
Use of FEA Derived Impedances to Design Active Structures
TL;DR: In this article, the authors used finite element analysis (FEA) to generate the host structure's mechanical impedances from eigenvectors of two-dimensional structures, though the method should be extendable to any structure that can be modeled by FEA and the equations to recover the impedances and structure's response from an FEA normal mode analysis are developed.