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Paleobiology; April 2005; v. 31; no. 2; p. 315-323; DOI: 10.1666/0094-8373(2005)031[0315:MRPOSI]2.0.CO;2
© 2005 Paleontological Society
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Microstructure-dictated resistance properties of some Indian dinosaur eggshells: finite element modeling

Rahul Srivastava1, Ashok Sahni2, Syed A. Jafar3 and Sanjay Mishra4

1 Rahul Srivastava. Department of Geology, Nagaland University, Kohima-797002, India.  rahulsrivastava71{at}rediffmail.com
2 Ashok Sahni. Centre of Advanced Studies in Geology, Panjab University, Chandigarh 160 014, India
3 Syed A. Jafar. 1-87, Dargah H. Shahwali, P.O. Golconda, Hyderabad-500 008, India
4 Sanjay Mishra. Department of Mechanical Engineering, Institute of Engineering and Technology, Lucknow-226021, India. sanjay_mishra{at}rediffmail.com

Finite element modeling (FEM) has been used to evaluate microstructure-controlled stability of selected eggshells of Indian dinosaurs. Our study suggests that under static load the eggshell microstructure of Megaloolithus cylindricus displays a low magnitude of tensile stress over most of the spherolith. The magnitude of this tensile stress is lower than that displayed in M. jabalpurensis, M. baghensis, and Subtiliolithus kachchhensis. In M. cylindricus, a shell thickness matching the length of the spheroliths prevents the failure of eggshells, whereas in M. jabalpurensis and M. baghensis, which have thinner shells, the development of additional subspheroliths compensates for the relatively higher magnitude of tensile stresses. Extremely thin eggshell in S. kachchhensis shows a still higher magnitude of tensile stresses, thereby making it prone to cracking, but the propagation of cracks is apparently checked and stability reinforced by wider spacing of pore canals.






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