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On the Pin Bearing Behavior of Orthotropic Fiber Metal Laminates

Department of Aerospace Engineering, Faculty of Engineering and Applied Science Ryerson University, 350 Victoria Street, Toronto, Ontario, M5B 2K3, Canada

C. Poon

Department of Aerospace Engineering, Faculty of Engineering and Applied Science Ryerson University, 350 Victoria Street, Toronto, Ontario, M5B 2K3, Canada, c1poon{at}ryerson.ca

K. Behdinan

Department of Aerospace Engineering, Faculty of Engineering and Applied Science Ryerson University, 350 Victoria Street, Toronto, Ontario, M5B 2K3, Canada

Z. Fawaz

Department of Aerospace Engineering, Faculty of Engineering and Applied Science Ryerson University, 350 Victoria Street, Toronto, Ontario, M5B 2K3, Canada

Experiments enforcing a pin bearing loading configuration were performed on a fully orthotropic GLARE 4 variant. The protocol employed in such experiments stemmed from a similar methodology performed on quasi-isotropic GLARE variants though now incorporating a local measurement scheme using biaxial strain gauges rather than uniaxial ones. The aim of this local measurement was both the extraction of novel bearing yield strength values and the detection of buckling within the aluminum layers. The encouragement of delamination and buckling was key since they not only form an integral portion of the proposed yielding through delamination buckling (YDB) mechanism but in addition, the pin bearing configuration — which ipso facto, encourages the former(s) — has been identified in the literature as the most conservative and accurate means for analyzing joint behavior and collapse. Analytical calculations previously performed support the empirical findings and provide direct evidence for the hegemony of aluminum yield strength in joint collapse. The proposed and employed protocol has been shown to be effective across a comprehensive range of GLARE variants and may be extended analogously to other standardized testing methodologies.

Key Words: fiber metal laminates • GLARE • orthotropic • bearing strength • yield strength • delamination buckling • experimental method.

Journal of Composite Materials, Vol. 42, No. 15, 1547-1566 (2008)
DOI: 10.1177/0021998308092207


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