[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]

Mechanical Characteristics of Sinosaurus (Theropoda) Crests (free pdf)



Ben Creisler
bcreisler@gmail.com


A new paper. The pdf is free at this link:


XING Lida,  WANG Yikun,  Eric SNIVELY,  ZHANG Jianping,  DONG Zhiming,
 Michael E. BURNS &  Philip J. CURRIE (2015)
Model-Based Identification of Mechanical Characteristics of Sinosaurus
(Theropoda) Crests.
Acta Geologica Sinica 89(1): 1-11
http://www.geojournals.cn/dzxben/ch/reader/view_abstract.aspx?file_no=201501003&flag=1




The paired cranial crests of Sinosaurus (Theropoda) have been
hypothesized as too weak to resist mechanical loads during combat.
Finite element analysis (FEA) is used to test this hypothesis, first
with geometry obtained through direct laser scanning of a
well-preserved fossil of the crest, and then with two conceptual FE
models of both crests analyzing the structure-deformation effects of
fenestration. In the original fossil model, under direct loading on
the dorsal faces of the crest, we found that the areas surrounding
cavities on the crest experience shear stress that implies a high
chance of material failure – the fracture of bone. In the conceptual
model, a series of computational studies were conducted with varying
loading directions. One simulation found that the shear stress and
strain in the material around the cavity presented more deformation
compared with the conceptual model without the cavities, and under
this morphologically realistic scenario the loading conditions would
result in local bone fractures. These model-based computational
results indicate that the crest could not resist high loads, because
it could not effectively decentralize the loading stress. Future
investigations need to focus on more comprehensive computational
experiments with more conditions, e.g. dynamical loading conditions,
and direct palaeontological evidence.