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Internal Contact Mechanics of 61-Wire Cable Strands

Brügger, A. ; Lee, S.-Y. ; Robinson, J. ; Morgantini, M. ; Betti, R. ; Noyan, I. C.

Experimental mechanics, 2022, Vol.62 (8), p.1475-1488 [Periódico revisado por pares]

New York: Springer US

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Título:
Internal Contact Mechanics of 61-Wire Cable Strands
Autor: Brügger, A. ; Lee, S.-Y. ; Robinson, J. ; Morgantini, M. ; Betti, R. ; Noyan, I. C.
Assuntos: Biomedical Engineering and Bioengineering ; Boundary conditions ; Bridge loads ; Characterization and Evaluation of Materials ; Clamping ; Compression loads ; Confinement ; Constituents ; Contact force ; Control ; Cross sections ; Diameters ; Dimensional tolerances ; Dynamical Systems ; Engineering ; Fire damage ; Genetic algorithms ; Heterogeneity ; Lasers ; Load transfer ; Mathematical analysis ; Mechanics (physics) ; Neutron beams ; Optical Devices ; Optics ; Optimization ; Photonics ; Plane stress ; Residual stress ; Shear strain ; Solid Mechanics ; Sp Iss: Advances in Residual Stress Technology ; Strands ; Stress distribution ; Suspension bridges ; Tensors ; Vibration ; Wire
É parte de: Experimental mechanics, 2022, Vol.62 (8), p.1475-1488
Descrição: Background We provide an insight into the internal mechanics of parallel wire strands, as found in suspension bridges ranging from the historic Brooklyn to the state-of-the-art Akashi Kaikyō Bridges. The confinement stresses of wires in a bridge cable are critical in generating sufficient friction for load transfer in the case of wire fracture or creep/relaxation due to fire damage. Objective We aim to non-destructively probe the internal stress distribution of the constituent wires of a 61-wire bridge cable strand model. These internal contact forces will, in turn, inform numerical models with realistic boundary conditions. Methods A parallel 61-wire strand is measured in the VULCAN Engineering Materials Diffractometer under various clamping loads. During the experiment, each of the 5 mm diameter constituent wires is interrogated using a neutron beam to measure four independent strain components, including in-plane shear strain, ultimately providing a full in-plane stress tensor. Results The measured strains show that confinement stresses vary significantly among the wires of the cross section. Under standard clamping loads, only half of the wires in the cross section carry significant compression load while the remainder of the wires are largely unstressed with respect to clamping. Conclusions We show that this heterogeneity is caused by micron-scale dimensional variations of the constituent wires due to manufacturing tolerances during wire production, resulting in a stochastic stress field among the various wires. Finally, we present a genetic algorithm optimization code that is capable of back-solving the inter-wire stiffnesses of strands for various loading scenarios and boundary conditions.
Editor: New York: Springer US
Idioma: Inglês

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Internal Contact Mechanics of 61-Wire Cable Strands

Brügger, A. ; Lee, S.-Y. ; Robinson, J. ; Morgantini, M. ; Betti, R. ; Noyan, I. C.

New York: Springer US

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