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All Dissertations
Title
- Computer: PC, Mac. Operating system: Windows, Mac OS, Linux. Has the code been vectorized or parallelized?: Yes. RAM: 2000 Megabytes. Classification: 4.6, 10, 18. Nature of problem: Modeling and simulation of two-dimensional multiple wave scattering by large clusters of circular cylinders for any frequency. The program is well-designed to.
- Subsurface Circular ($5) Following its recent Mac release, Subsurface Circular is now also available on iPad—but not iPhone—bringing the acclaimed, single-sitting narrative game to tablets.
Author
Date of Award
12-2018
Document Type
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Dissertation
Degree Name
Doctor of Philosophy (PhD)
Department
Automotive Engineering
Committee Member
Laine Mears, Committee Chair
Committee Member
Hongseok Choi
Committee Member
Gregory Mocko
Committee Member
Robert Prucka
Abstract
The objective of this research is to understand the mechanics of the trochoidal milling process and its effects on the end-product quality and overall machining cost in the milling of nickel-based superalloys, through a novel toolpath representation with semi-mechanistic cutting force models with correlations to the machining-affected zone (MAZ). Nickel-based superalloys are designed for use in extreme environments with high temperatures, where corrosion and creep resistance are required in addition to high levels of strength. Such environments are found in the aircraft, nuclear, and gas turbine industries. Due to the design of the microstructure of these alloys they represent the most difficult to machine material group. A combination of aggressive tool wear and resultant required low machining speeds make the manufacturing costs of these components very high. This research narrows the knowledge gap that exists in nickel-based superalloy milling through the investigation of the trochoidal milling tool path which has been heuristically identified to increase tool life and reduce cutting forces. The application of this toolpath in nickel-based superalloys is not straightforward and must be better understood to increase its viability for commercial applications. This work aims to fully classify this milling technique through a semi-mechanistic force model which is developed on top of a novel chip thickness model, including the effects of tool wear on cutting pressures and resultant product microstructure. A crucial property that must be investigated when milling nickel-based superalloys is the mechanically-induced subsurface damage that occurs while implementing alternative tool paths. This subsurface damage layer induced by the machining process is referred to as the machining-affected zone (MAZ), and its control is crucial for the successful operation of manufactured parts in their operating environment. To this end, material analysis was completed to gain insight into the interactions between toolpath geometry, cutting conditions, tool wear, and this machining-affected zone in both the radial and axial directions. This work is the first to provide a full understanding of the trochoidal milling machine parameters in nickel-based superalloys. Building upon this knowledge a more detailed understanding of the process is provided by the novel instantaneous uncut chip thickness model for trochoidal milling which does not use circular approximations, instead providing an accurate geometric model for each chip. This model is then utilized to provide cutting force predictions for the trochoidal process. When developing the cutting force prediction model, the classical approach of gathering cutting force coefficients for model calibration using slotting or shoulder milling is shown to be inaccurate in this work. Slot milling tests, regardless of their parameter match to trochoidal milling as formulated in this text, cannot provide cutting force coefficients to produce an accurate force prediction model. To account for the rapid accumulation of tool wear that occurs when milling NBSAs new coefficients are proposed for semi-mechanistic force modeling which accounts for both machining conditions and tool wear state. These novel coefficients combine the historic cutting force and edge force coefficients into a single model and account for tool wear state through the volume removed by the process and greatly improve the force prediction of trochoidal milling. The machining affected zone is also evaluated in this work for Inconel 718 while undergoing trochoidal milling. Both the nutational and rotational rates are related to the axial MAZ depth, where low nutational rates combined with high rotational rates increase the axial depth of deformed grains. The radial MAZ direction measurement is also investigated in this work to understand what subsequent trochoidal passes will encounter. Unlike the axial depth, the radial depth is dependent upon the resultant milling force of the tangential and radial directions. In both direction tool flank wear is an important parameter which increased the depth across all parameters.
Recommended Citation
Pleta, Abram, 'Alternative Milling Path Planning Strategies and Force Modeling for Nickel-Based Superalloys' (2018). All Dissertations. 2270.
https://tigerprints.clemson.edu/all_dissertations/2270
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High Stakes, Highly Powered
Protego, the world's leading spy agency, has been destroyed. Only one person can wield C.A.R.D.S to take control of Protego's scattered spy crews and save the world.
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Once you've taken back control of Protego, play infinitely via Skirmish, or test your skills against the clock in Countdown, a survival mode that will test your grasp of the game's surprising tactical depths.
Key Features:
- Three modes make this the biggest Bithell Short yet! Campaign tells a tightly packed story and introduces the game's mechanics. Countdown tests your endurance with wave after wave of unique decks, and Skirmish gives you an infinite playground to enjoy unlocked crews.
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FAQs
Is this a solitaire game?
Yes-ish. The Solitaire Conspiracy is inspired by a variant of solitaire called Streets and Alleys, but with some small adjustments and the big addition of suit based powers. Campaign and skirmish (choose your own suits and powers) are take-at-your-own-pace experiences that fit into your schedule. Countdown mode is a place to test your skills with nuanced powers against a ticking clock. This game is endlessly replayable.
Are there microtransactions?
Nope. We know we made a card game, and we know that there's a risk you might think this game will charge you for unlocks, speed bonuses or aesthetics. We won't. We may come up with a cool DLC at some point, and if so, will probably charge in the traditional way, but we won't be charging you for double XP or a particularly shiny new colour theme.
Is this Bithell Short an entry in the 'Circular' series?
No. While our previous Bithell Shorts (Subsurface Circular and Quarantine Circular) have been twists on the text adventure, The Solitaire Conspiracy is a new take on solitaire. We love storytelling and world-building, so it absolutely contains a full narrative experience, which we're telling via full-motion video (FMV) and in-game lore. We decided to use the Bithell Short name to signal something digestible and original. Thanks for continuing to support these odd experiments between our larger projects.
If this game is ‘short', what's to stop me getting a refund when I'm done?
The Solitaire Conspiracy is our third Bithell Short. Our previous two games, Subsurface Circular and Quarantine Circular, both have a return rate of less than 2%. Steam players have shown us that they understand the work that goes into games, and are up for paying for ones that entertain them. Thank you (again).
Do I need to have played other Bithell Shorts games to enjoy this one?
Not at all. The Solitaire Conspiracy is an entirely different game from Subsurface Circular and Quarantine Circular. It tells its own self-contained story set in a world of spies and intrigue. Of course, our games are all set in a shared universe, so expect some mentions of old friends.
Subsurface Circular (itch) Mac Os Download
SYSTEM REQUIREMENTS
- OS: Windows 10
- Processor: 1.4 GHz Intel Core i5
- Memory: 4 GB RAM
- Graphics: Integrated
- Storage: 1 GB available space
Subsurface Circular (itch) Mac Os Operating System
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