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Experimental Mechanics
Erschienen in: Experimental Mechanics 2/2013

01.02.2013

Neutron Diffraction Measurement of Stress Redistribution in Parallel Seven-Wire Strands after Local Fracture

verfasst von: F. Mei, I. C. Noyan, A. Brügger, R. Betti, B. Clausen, D. Brown, T. Sisneros

Erschienen in: Experimental Mechanics | Ausgabe 2/2013

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Abstract

We report results from neutron diffraction experiments where partitioning of applied tensile load between the inner and outer wires of seven-wire parallel and quasi-parallel wire strands were measured while 1-all wires were undergoing elastic deformation, 2-where one wire within the bundle was undergoing plastic flow and, 3-when one or more wires fractured under load. The results indicate that mechanical interference and friction mechanisms have similar contributions to the load transferred to fractured wires, and both mechanisms should be included in analytical or numerical formulations of strain partitioning in quasi-parallel wire cables.
Vorheriger Artikel Mapping Multiple Components of the Residual Stress Tensor in a Large P91 Steel Pipe Girth Weld Using a Single Contour Cut
Nächster Artikel Neutron Diffraction Analysis of Complete Residual Stress Tensors in Conventional and Rolled Gas Metal Arc Welds

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Fußnoten
1
We define the “effective stress transfer length” as the longitudinal distance, measured from the fracture location, a broken wire recovers its full share of the applied load when multiple strain transfer mechanisms are operating.
 
2
Figure 1(b) depicts a load-bearing wire with a full twist around a short wire-segment. In our experiments the outer wires were twisted very slightly around the central axis. However, since the wires were clamped together, compatibility of deformation within the strand would hinder unraveling of individual wires and create pinch points.
 
5
We are using ∂ε yy / ∂σ A only as a relative measure of the load uptake between identical wires loaded simultaneously, in parallel, from a common set of grips in the elastic regime. If all other parameters are equal, ∂ε yy / ∂σ A should be identical in all wires[16‐19]. Further details about Rietveld fitting and associated reliability factors can be found in Reference [20].
 
6
To check the precision of the data, strain measurements were repeated in each wire of Sample S3-I at 225 MPa applied load. We observe that the scatter in the data for all wires are quite close to the error calculated by the GSAS program.
 
7
This also shows that the strain calculated through the Rietveld procedure is equivalent to the average macroscopic elastic strain.
 
8
Such constraint can also account for the compressive residual strain observed in the central wire after fracture: due to the rapid, dynamic, contraction, the broken wire segment shrinks past the zero strain level and the friction of the (stationary) surrounding wires prevent it from lengthening subsequently to reach zero strain.
 
9
This value is calculated from the applied load with the actual cross-section for six wires.
 
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Metadaten
Titel
Neutron Diffraction Measurement of Stress Redistribution in Parallel Seven-Wire Strands after Local Fracture
verfasst von
F. Mei
I. C. Noyan
A. Brügger
R. Betti
B. Clausen
D. Brown
T. Sisneros
Publikationsdatum
01.02.2013
Verlag
Springer US
Erschienen in
Experimental Mechanics / Ausgabe 2/2013
Print ISSN: 0014-4851
Elektronische ISSN: 1741-2765
DOI
https://doi.org/10.1007/s11340-012-9621-5

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