Research & Papers on Robert Carson

Additive Manufacturing Simulation & Uncertainty Quantification

Tue, 15 Apr 2025 00:00:00 +0000

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Metal additive manufacturing, particularly laser powder bed fusion (LPBF), creates a scientific challenge that most manufacturing processes do not: the mechanical properties of the resulting part depend on a cascade of physical processes spanning many orders of magnitude in scale, from the nanosecond laser-material interaction at the melt pool surface, through the solidification dynamics that determine grain nucleation and growth, to the part-scale stress distributions that determine structural performance. The microstructure and therefore the properties vary spatially as a function of local thermal history, which itself depends on laser parameters, scan strategy, part geometry, and proximity to other features.

BCC Crystal Plasticity & High Strain-Rate Mechanics

Tue, 15 Apr 2025 00:00:00 +0000

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Body-centered cubic (BCC) metals are among the most mechanically interesting crystalline solids to model. Unlike FCC metals, where slip occurs on well-defined {111}⟨110⟩ systems and the dislocation physics is relatively well understood, BCC plasticity is governed by thermally activated screw dislocation motion with non-planar core structures. This produces strong temperature and strain-rate sensitivity, and a persistent debate about which slip planes are actually active under different loading conditions.

High Performance Computing & GPU-Accelerated Scientific Software

Tue, 15 Apr 2025 00:00:00 +0000

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For roughly forty years, scientific codes got faster by waiting for the next hardware generation. That era ended. Peak floating-point throughput stopped scaling the way it used to, and the compute density now available in leadership-class machines comes almost entirely from GPU accelerators — thousands of streaming multiprocessors per node, operating under a fundamentally different programming model than the CPU clusters that most production scientific software was written for.

Intragranular Deformation & Crystal Lattice Methods

Tue, 15 Apr 2025 00:00:00 +0000

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Fatigue is one of the grand challenges in engineering. The first published study appeared in 1837 on mining conveyor chains that failed in service. By the end of the 20th century, over 100,000 papers had been written on the subject, and the problem is still not solved. The reason is that fatigue failure depends on a wide range of interacting factors: residual stress, thermal processing, surface condition, environment, and most fundamentally, the microstructure of the material itself. The Aloha Airlines Flight 243 accident, where fatigue cracks in fuselage lap joints caused a section of the cabin roof to separate in flight, is one example among many that drove enormous investment in understanding how cracks initiate and grow under cyclic loading.

Research & Papers on Robert Carson

Additive Manufacturing Simulation & Uncertainty Quantification

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BCC Crystal Plasticity & High Strain-Rate Mechanics

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High Performance Computing & GPU-Accelerated Scientific Software

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Intragranular Deformation & Crystal Lattice Methods

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