Finite Element Analyses of Ankylosaurid Dinosaur Tail Club Impacts
Finite Element Analyses of Ankylosaurid Dinosaur Tail Club Impacts
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DOI：
10.1002/ar.20987
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发表时间：
2009-09-01
影响因子：
2
通讯作者：
Snively, Eric
中科院分区：
文献类型：
--
作者：
Arbour, Victoria M.;Snively, Eric
甲龙科恐龙有改良的尾椎末端（柄）和大的末端。尾部的骨皮（节）一起形成一个尾巴棒。通过对化石标本的计算机断层扫描，建立了Euoplocephalus tutus四个尾棒的三维数字模型。我们建议使用有限元建模，以检查应力分布在模拟的尾巴俱乐部的影响，以确定假设的尾巴俱乐部行为的生物学可行性。结果表明，峰值应力是人为的高刚性约束。这些数据表明，具有小的和中等大小的旋钮的尾杆在强力撞击过程中不太可能失效，但大的球杆可能有头部到旋钮断裂的风险。改良的手柄椎骨能够支撑甚至非常大的旋钮的重量。手柄椎骨中的长前突和神经棘有助于沿着手柄均匀分布应力。我们的结论是尾巴摆动行为可能已经在Euoplocephalus，但更复杂的模型，灵活的约束条件，需要支持这一假设。Anat Rec，292：1412-1426，2009. (C)2009威利-利斯公司
Ankylosaurid dinosaurs have modified distal caudal vertebrae (the handle) and large terminal. caudal osteoderms (the knob) that together form a tail club. Three-dimensional digital models of four tail clubs referred to Euoplocephalus tutus were created from computed tomography scans of fossil specimens. We propose to use finite element modeling to examine the distribution of stress in simulated tail club impacts in order to determine the biological feasibility of hypothesized tail clubbing behavior. Results show that peak stresses were artificially high at the rigid constraint. The data suggest that tail clubs with small and average-sized knobs were unlikely to fail during forceful impacts, but large clubs may have been at risk of fracture cranial to the knob. The modified handle vertebrae were capable of supporting the weight of even very large knobs. Long prezygapophyses and neural spines in the handle vertebrae helped distribute stress evenly along the handle. We conclude that tail swinging-behavior may have been possible in Euoplocephalus, but more sophisticated models incorporating flexible constraints are needed to support this hypothesis. Anat Rec, 292:1412-1426, 2009. (C) 2009 Wiley-Liss, Inc.