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Isotropic random fracture model for metal hydride powder

By Kyle Christopher Smith

Purdue University

Simulate particle morphology of metal hydride powder by an istropic random fracture process

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Version 1.0 - published on 24 Oct 2011

doi:10.4231/D31V5BC8W cite this

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Particle size distribution generated with Example #1 Particles formed from Example #1 Sphericity distribution generated with Example #1

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Abstract

Metal hydrides can be used to store hydrogen on-board fuel cell vehicles, but the process of fracture that the material undergoes when exposed to hydrogen makes metal hydrides poor conductors of heat due to the particulate nature of fractured metal hydride. The fracture process by which particles are generated results in irregular faceted morphology that are difficult to describe quantitatively from experimental data. The isotropic random fracture model, rndmfrc, generates convex polyhedra by the sequential fracture of isotropic, randomly oriented planes, and can be used to model particles composing metal hydride powder. The isotropic random fracture model assumes (1) planar surfaces are formed from instances of fracture, (2) planes of fracture have isotropic statistical orientation and position throughout the material, and (3) fracture of any individual particle can terminate during the sequential fracture process according to a criterion. This tool enables modeling of discrete metal hydride particles under the approximation of planar fracture with isotropic orientation and position.

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General Motors, Inc.; KCS thanks NSF for a graduate research fellowship

Publications

Smith K.C. and Fisher T.S., Physics based models for metal hydride particle morphology, size distribution, packing, and effective thermal conductivity, MRS Spring 2009 Meeting

Cite this work

Researchers should cite this work as follows:

  • Smith K.C. and Fisher T.S., Physics based models for metal hydride particle morphology, size distribution, packing, and effective thermal conductivity, MRS Spring 2009 Meeting
  • Kyle Christopher Smith (2011), "Isotropic random fracture model for metal hydride powder," https://nanohub.org/resources/rndmfrc. (DOI: 10.4231/D31V5BC8W).

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