Damping capacity measurement of elastic porous wire-mesh material in wide temperature range

The mechanics of shape memory alloy metal rubber

“…If one assumes that the inclination angles within the molded sample are represented by a normal distribution, the mean value of the inclination angles is u ¼ arctan 1 r , where r is molding ratio (about 3-5 in general [8][9][10]16,[23][24][25]). The molding ratio is defined as the ratio between the heights of the SMA-MR sample before and after molding.…”

“…Examples of smart materials in this field of applications are piezoelectrics [1,2], electro and magneto-rheological materials [3,4], and shape memory alloys (SMA) [5,6]. SMAs based on nickel titanium (nitinol) can provide variable stiffness in the order of [8][9][10][11][12][13][14][15][16] GPa and also offer biocompatibility characteristics [7]. Metal Rubber (MR) is a porous material with high damping properties (loss factor between 0.1 and 0.3) and large stiffness (Young's modulus up to 100 MPa) [8][9][10] manufactured from coiled metal wire via a process of wire-drawing, weaving and compression molding.…”

“…The term Metal Rubber arises from the similarity between the properties of MR and those of an elastomeric rubber, although some authors prefer to use the terms ''entangled metallic wire material [11]'' or ''metal wire mesh [12]''. It is commercially available in a variety of applications such as sealing, filtering and vibration absorbers, because of its characteristics of elasticity, damping, reliability and adaptation to the operational environment [11][12][13][14][15][16].…”

“…Shape memory alloy metal rubber (SMA-MR) is manufactured using nitinol SMA wire following a production process similar to the one adopted in the manufacturing of metal rubber (MR) [8,16]. SMA-MR exhibits not only the characteristics typical of classical nickel-based metal rubber (nonlinear stiffness, large damping and transverse mechanical isotropy [8,16]) but also a temperature dependency and heat treatment effects due to the nitinol wires composing the microstructure [10,[18][19][20].…”

“…SMA-MR exhibits not only the characteristics typical of classical nickel-based metal rubber (nonlinear stiffness, large damping and transverse mechanical isotropy [8,16]) but also a temperature dependency and heat treatment effects due to the nitinol wires composing the microstructure [10,[18][19][20]. Quasi-static compression tests have shown the strong dependence of the SMA-MR mechanical properties upon its specific manufacturing parameters [17][18][19].…”