Modeling Fracture and Delamination of Spray-Applied Fire-Resisting Materials under Static and Impact Loads
Publication: Journal of Engineering Mechanics
Volume 137, Issue 12
Abstract
A specially developed two-dimensional cohesive zone finite element (CZFE) scheme is applied to simulate the fracture and delamination phenomena that occur in spray-applied fire-resisting material (SFRM) on steel structures. A cohesive zone material model for the SFRM is introduced and utilized to model both the internal cohesion in SFRM and the interfacial adhesion at the steel-SFRM interface. The CZFE model is validated by comparing predictions from the model with results from an adhesion test conducted at ambient temperature. The validated model is successfully applied to simulate the spontaneous initiation and propagation of cracks in the SFRM under static and impact loads. Results from the numerical studies indicate that the proposed model is capable of predicting the initiation and propagation of cracks within the insulation material and at the interface. The results show that the development of transverse cracks in the insulation layer help prevent further delamination of the SFRM. Also, it was found that for larger thicknesses of insulation, delamination occurs at less direct tension or flexural stresses. Results from impact simulations show that there is an optimum insulation thickness for resisting the delamination induced by impact loads.
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Acknowledgments
The authors wish to acknowledge the support of Michigan State University (through Strategic Partnership Grant # UNSPECIFIEDSPG 71-4434). Any opinions, findings, conclusions, or recommendations expressed in this paper are those of the authors and do not necessarily reflect the views of the sponsors.
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Information & Authors
Information
Published In
Journal of Engineering Mechanics
Volume 137 • Issue 12 • December 2011
Pages: 901 - 910
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Nov 11, 2010
Accepted: Jun 22, 2011
Published online: Jun 24, 2011
Published in print: Dec 1, 2011
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