Morphological and Mechanical Characterization of Adolescent Yucatan Miniature Porcine Skull, Addendum to ARL-TR-8489
Abstract
Based on the findings of ARL-TR-8489, this addendum presents a simplified mechanical model to describe the structural stress-strain response of the skull of the adolescent Yucatan miniature pig under compression. In particular, ARL-TR-8489 focused only on the initial linear response before the bone microstructure began to fail locally, observed as crushing at the macrostructural scale. The experimental setup was not designed to accurately record the local and global stress-strain response after the bone began to crush and compact. However, a complete stress-strain response up to macroscopic failure, which included both the initial and post-compaction regimes, was needed in order to directly input into finite element simulations involving this species. To our knowledge, such information on the progress of local failure leading to corresponding global response is not currently in the open literature. The mechanical response after initiation of localized failure from other types of bones could not be used without a loss of accuracy in the predictions from simulations due to the large amount of biovariability in bone microstructure and mechanics. In ARL-TR-8489, the microstructure of the Yucatan skull bone was reported as approximately isotropic at the macro-scale, with low variations of bone volume fraction in the skull. Therefore, in the present addendum, the Yucatan skull is treated as a single homogeneous layer, and its stress-strain response modeled as tri-linear. The initial response is followed by softening while the bone is being crushed. After the bone has fully compacted, the skull stiffness increases considerably until failure.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 2019
- Accession Number
- AD1086707
Entities
People
- Stephen L. Alexander
- Tusit Weerasooriya