Model-based identification of mechanical characteristics of Sinosaurus (Theropoda) crests

Lida Xing, Yikun Wang, Eric Snively, Jianping Zhang, Zhiming Dong, Michael E. Burns, Philip J. Currie

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Abstract: 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.

Original languageEnglish
Pages (from-to)1-11
Number of pages11
JournalActa Geologica Sinica
Volume89
Issue number1
StatePublished - 1 Jan 2015
Externally publishedYes

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cavity
shear stress
bone
fossil
shear strain
laser
geometry
simulation
experiment
material
analysis
effect
test

Keywords

  • Behavior
  • Dinosauria
  • Finite element analysis
  • Sinosaurus

Cite this

Xing, L., Wang, Y., Snively, E., Zhang, J., Dong, Z., Burns, M. E., & Currie, P. J. (2015). Model-based identification of mechanical characteristics of Sinosaurus (Theropoda) crests. Acta Geologica Sinica, 89(1), 1-11.
Xing, Lida ; Wang, Yikun ; Snively, Eric ; Zhang, Jianping ; Dong, Zhiming ; Burns, Michael E. ; Currie, Philip J. / Model-based identification of mechanical characteristics of Sinosaurus (Theropoda) crests. In: Acta Geologica Sinica. 2015 ; Vol. 89, No. 1. pp. 1-11.
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Xing, L, Wang, Y, Snively, E, Zhang, J, Dong, Z, Burns, ME & Currie, PJ 2015, 'Model-based identification of mechanical characteristics of Sinosaurus (Theropoda) crests', Acta Geologica Sinica, vol. 89, no. 1, pp. 1-11.

Model-based identification of mechanical characteristics of Sinosaurus (Theropoda) crests. / Xing, Lida; Wang, Yikun; Snively, Eric; Zhang, Jianping; Dong, Zhiming; Burns, Michael E.; Currie, Philip J.

In: Acta Geologica Sinica, Vol. 89, No. 1, 01.01.2015, p. 1-11.

Research output: Contribution to journalArticle

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AU - Burns, Michael E.

AU - Currie, Philip J.

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N2 - Abstract: 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.

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