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Materials 2015, 8(9), 5606-5620; doi:10.3390/ma8095266

Processing, Structural Characterization and Comparative Studies on Uniaxial Tensile Properties of a New Type of Porous Twisted Wire Material

School of Mechanical and Automotive Engineering, South China University of Technology, 381Wushan Road, Tianhe District, Guangzhou 510640, China
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Academic Editor: Dominik Brühwiler
Received: 6 June 2015 / Revised: 11 July 2015 / Accepted: 5 August 2015 / Published: 27 August 2015
(This article belongs to the Section Porous Materials)
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Abstract

A self-developed rotary multi-cutter device cuts stainless steel wire ropes into segments to fabricate twisted wires. Stainless steel porous twisted wire materials (PTWMs) with a spatial composite intertexture structure are produced by the compaction and subsequent vacuum solid-phase sintering of twisted wires. The stainless steel PTWMs show two types of typical uniaxial tensile failure modes, i.e., a 45° angle fracture mode and an auxetic failure mode (the PTWMs expand along the direction perpendicular to the tension). The effects of the sintering parameters, porosities, wire diameters, and sampling direction on the tensile properties of the PTWMs are carefully investigated. By increasing the sintering temperature from 1130 °C to 1330 °C, the tensile strength of the PTWMs with 70% target porosity increased from 7.7 MPa to 28.6 MPa and the total failure goes down to 50%. When increasing the sintering time from 90 min to 150 min, the tensile strength increases from 12.4 MPa to 19.1 MPa and the total failure elongation drops to 78.6%. The tensile strength of the PTWMs increases from 28.9 MPa to 112.7 MPa with decreasing porosity from 69.5% to 46.0%, and the total failure elongation also increases from 14.8% to 40.7%. The tensile strength and the failure strain of the PTWMs with fine wires are higher than those of the PTWMs with coarse wires under the same porosity. Sampling direction has a small influence on the tensile properties of the PTWMs. View Full-Text
Keywords: porous twisted wire materials; structural characterization; tensile failure; sintering parameter; porosity; wire diameter; sampling direction porous twisted wire materials; structural characterization; tensile failure; sintering parameter; porosity; wire diameter; sampling direction
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Wu, F.; Zhou, Z.; Duan, L.; Xiao, Z. Processing, Structural Characterization and Comparative Studies on Uniaxial Tensile Properties of a New Type of Porous Twisted Wire Material. Materials 2015, 8, 5606-5620.

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