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Measurement of Strain/Load Transfer in Parallel Seven-wire Strands with Neutron Diffraction

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Abstract

The elastic strains induced in the constituent wires of parallel wire strands under tensile loading were measured using neutron diffraction. The elastic strains carried by the individual wires depended very strongly on the boundary conditions at the grips and on radial clamping forces. The friction forces between the wires were quite significant and should not be neglected in analytical or numerical formulations of strain partitioning in parallel wire cables.

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Notes

  1. This length is analogous to the critical length in shear-lag formulations.

  2. The wires were taken from a standard 152.4 cm diameter (60”) reel and exhibited significant curvature. They were used without straightening.

  3. Curtis Universal Joint Company, http://www.curtisuniversal.com/index.html

  4. Socktfast Resin Compound by ESCO® (http://www.escocorp.com/markets/rigging/socketfast.html)

  5. Crosby G-450, or equivalent, wire rope clips were used.

  6. This enables the acquisition of diffraction data from the axial and transverse directions simultaneously [11].

  7. The lines shown in Figs. 7, 8, 9 and 10 simply connect the points to guide the eye. We used linear least-squares regression fit to obtain the slopes used in the analysis.

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Acknowledgements

We would like to thank Dr. Donald W. Brown (MST-8, Los Alamos National Laboratory) for helping plan the experiment. The samples were manufactured by Mr. Johny Manchery, Senior Laboratory Technician, of the Carleton Laboratory of Columbia University. Mr. Thomas A. Sisneros from Lujan Center modified the grips and assisted with the sample set-up. We thank Prof. Chris Marianetti of Columbia University for discussions and for welding the wires in Specimen B. This work has benefited from the use of the Lujan Neutron Scattering Center at LANSCE, which is funded by the Department of Energy’s Office of Basic Energy Sciences. Los Alamos National Laboratory is operated by Los Alamos National Security LLC under DOE Contract DE-AC52-06NA25396.

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Authors and Affiliations

  1. Department of Applied Physics and Applied Mathematics, Columbia University, New York, NY, USA

    I. C. Noyan

  2. Department of Civil Engineering and Engineering Mechanics, Columbia University, New York, NY, USA

    A. Brügger & R. Betti

  3. LANSCE-LC, Los Alamos National Laboratory, Los Alamos, NM, USA

    B. Clausen

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  1. I. C. Noyan
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  2. A. Brügger
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  3. R. Betti
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  4. B. Clausen
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Correspondence to I. C. Noyan.

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Noyan, I.C., Brügger, A., Betti, R. et al. Measurement of Strain/Load Transfer in Parallel Seven-wire Strands with Neutron Diffraction. Exp Mech 50, 265–272 (2010). https://doi.org/10.1007/s11340-009-9313-y

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