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Experimental Mechanics

Erschienen in:

01.09.2022 | Sp Iss: Advances in Residual Stress Technology

Internal Contact Mechanics of 61-Wire Cable Strands

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

Erschienen in: Experimental Mechanics | Ausgabe 8/2022

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Abstract

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.

Vorheriger Artikel Physics-Informed and Data-Driven Prediction of Residual Stress in Three-Dimensional Machining

Nächster Artikel Incremental FIB-DIC Ring-Core Methods for the Residual Stress Measurement of Bilayer Thin Films

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The 4 μm quoted here includes a correction to the Gjelsvik proof presented by Raoof and Huang in their article.

Mituyoto Precision Electronic Inside & Tubular Micrometer 0.0010 mm resolution and 0.0050 mm accuracy.

The Young’s modulus, yield point, and plastic yield stress piecewise linear curves (see Appendix) were derived from ASTM A370/E8 tests performed at the Carleton Laboratory. The tests were performed on a sample of material that was used to fabricate the test specimen. The Poisson’s ratio was taken from the ABAQUS materials library.

CPU threads: 24 @ 2.4 GHz; RAM: 128 GB; Operating System: Windows Server.

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Titel: Internal Contact Mechanics of 61-Wire Cable Strands
verfasst von: A. Brügger
S.-Y. Lee
J. Robinson
M. Morgantini
R. Betti
I. C. Noyan
Publikationsdatum: 01.09.2022
Verlag: Springer US
Erschienen in: Experimental Mechanics / Ausgabe 8/2022
Print ISSN: 0014-4851
Elektronische ISSN: 1741-2765
DOI: https://doi.org/10.1007/s11340-022-00896-w

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Abstract

Background

Objective

Methods

Results

Conclusions

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