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Derisi B.,Concordia University at Montreal | Derisi B.,Center for Research in Polymers and Composites | Hoa S.V.,Concordia University at Montreal | Hoa S.V.,Center for Research in Polymers and Composites | And 4 more authors.
Journal of Thermoplastic Composite Materials | Year: 2011

In an effort to develop thermoplastic composite tubes for helicopter landing gear applications, the mechanical behavior of straight tubes subjected to bending has been studied and presented here. It was found that interlaminar normal stresses of large values exist between layers located under the loading point. This can cause delamination between different layers at location under the loading point. The stiffness of the tube along the circumferential direction is important to prevent inward deformation under the load point, which can lead to buckling and sudden load drop. The absorption of energy upon fracture depends on the strategic placement of layers having different strain limits at proper locations along the thickness direction. © The Author(s), 2011. Source


Shadmehri F.,Concordia University at Montreal | Shadmehri F.,Center for Research in Polymers and Composites | Derisi B.,Concordia University at Montreal | Derisi B.,Center for Research in Polymers and Composites | And 2 more authors.
Composite Structures | Year: 2011

Theoretical formulations are provided for the determination of stiffness of composite tubes. A threedimensional laminate theory is used to determine the equivalent flexural stiffness hEIi for composite tubes. The same theory is also used to determine the load versus axial strain of the tubes. An approximate (more simplified) formulation is also presented. Values of the equivalent bending stiffness hEIi are compared between the two formulations. Experimental work was carried out on four composite tubes made of different lay-ups. The stiffness represented by the slope of the force-axial strains compares well between theoretical formulation and experimental results. © 2011 Elsevier Ltd. Source

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