Compressive and pseudo-elastic hysteresis behavior of entangled titanium wire materials

Two types of entangled titanium wire materials (ETWMs) have been fabricated through different procedures. Their entangled structure, compressive mechanical properties, and strain hysteresis behavior have been investigated. The experiment has demonstrated that the entangled wire structure can be adjusted when different fabrication methods are applied. The entangled wire morphologies can be normal entangled wires or coiled wires, and the pore size distributions are alternative so as to adapt the entangled wire morphology. The ETWMs with normal wire exhibit 2.6 +/- 0.1 to 31.1 +/- 0.8 MPa yield strength and 135.3 +/- 2.9 to 816.5 +/- 8.4 MPa Young's modulus in the range of 77.6 +/- 0.2% to 47.8 +/- 0.4% porosity. While the ETWMs with coiled wire exhibit 1.1 +/- 0.1 to 19.1 +/- 0.5 MPa yield strength and 27.4 +/- 0.5 to 623.2 +/- 5.8 MPa Young's modulus in the same porosity range. The two types of the ETWMs reveal significant strain hysteresis effect, which becomes stronger as the porosity increases. The coiled wire in the entangled wire structure improves the hysteresis effect. Such pseudo-elastic hysteresis behavior and the damping and energy dissipation capability are very promising for applications in engineering, biomedicine, aviation, astronavigation, and other industries. (C) 2010 Elsevier B.V. All rights reserved.