TY - GEN
T1 - Computational micromechanics of trabecular porcine skull bone using the material point method
AU - Fang, Ziwen
AU - Ranslow, Allison N.
AU - Kraft, Reuben H.
N1 - Publisher Copyright:
© 2016 by ASME.
PY - 2016
Y1 - 2016
N2 - The trabecular bone in the porcine skull is geometrically complex. It can be characterized experimentally, but requires many test configurations, loading rates, and samples to develop trusted constitutive models that fully characterize the complexity. Typically, Lagrangian finite element simulations are used in the bone modeling community to replicate experimental results for model validation and determination of material properties. In this approach, microCT images are used to develop anatomically accurate surfaces that are then volume meshed. While this modeling approach is valuable, there are some limitations. For example, with high-resolution micoCT data, traditional meshing techniques have proven to be insufficient. Specifically with highly porous trabecular bone data, the complexity of the pore architecture is difficult to be replicated by finite element mesh. To overcome this challenge, the application of material point method (MPM) has been investigated for analyzing the material properties of trabecular bone. This meshless method requires a "particle mesh" that can be derived directly from the microCT data. This process is much easier than developing a finite element mesh. Preliminary results have focused on generating the stress-strain curves for quasi-static loading and comparing numerical predictions with experimental results, as well as verifying the MPM against the finite element method. Initial results are promising and we have seen good comparison with experimental results. Parallel scalability of MPM has also been assessed since large-scale simulations can be expected for the future research.
AB - The trabecular bone in the porcine skull is geometrically complex. It can be characterized experimentally, but requires many test configurations, loading rates, and samples to develop trusted constitutive models that fully characterize the complexity. Typically, Lagrangian finite element simulations are used in the bone modeling community to replicate experimental results for model validation and determination of material properties. In this approach, microCT images are used to develop anatomically accurate surfaces that are then volume meshed. While this modeling approach is valuable, there are some limitations. For example, with high-resolution micoCT data, traditional meshing techniques have proven to be insufficient. Specifically with highly porous trabecular bone data, the complexity of the pore architecture is difficult to be replicated by finite element mesh. To overcome this challenge, the application of material point method (MPM) has been investigated for analyzing the material properties of trabecular bone. This meshless method requires a "particle mesh" that can be derived directly from the microCT data. This process is much easier than developing a finite element mesh. Preliminary results have focused on generating the stress-strain curves for quasi-static loading and comparing numerical predictions with experimental results, as well as verifying the MPM against the finite element method. Initial results are promising and we have seen good comparison with experimental results. Parallel scalability of MPM has also been assessed since large-scale simulations can be expected for the future research.
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U2 - 10.1115/IMECE2016-67748
DO - 10.1115/IMECE2016-67748
M3 - Conference contribution
AN - SCOPUS:85021667078
T3 - ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)
BT - Biomedical and Biotechnology Engineering
PB - American Society of Mechanical Engineers (ASME)
T2 - ASME 2016 International Mechanical Engineering Congress and Exposition, IMECE 2016
Y2 - 11 November 2016 through 17 November 2016
ER -