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Ω = 1.44 0 1 2 3 4 5 s
tissue occurred at all structure levels of collagen and was due in part to bonds between fibrils and fibers. However, the uncoiling and aligning movement of collagen should not be the main mechanism for the case here, since the compressive tests are performed through the skin thickness direction and a similar stretch sensitivity has been observed at all damage levels. Thus the stretch-rate sensitivity may be attributed to the variation of viscous interaction between collagen fibers and ground substance induced by hydration change accompanying thermal damage. For example, the stretch-rate sensitivity was well modeled by Shergold et al. (2006) by increasing the shear modulus with increasing stretch rate, with no attendant change in the stretch hardening exponent. Arumugam et al. (1994) also attributed the higher stress to higher frictional force at higher stretch rates. The movement of fluid in the hydrated matrix may also play an important role (Li, Armstrong, & Mow, 1983). F.Xu andT.J.Lu 5.4. Relaxation Behavior of Skin Tissue Skin tissue is a viscoelastic material. However, to the authors’ best knowledge, there is no publishedstudy on the temperature dependency of skin viscoelasticity, although other collagenous tissues such as cartilage (Chae et al., 2003; ATh=37 °C, t h= 0 s, W = 0.0 5 25 50 125 250 g (%/min) 1.0 1,cheap air max for sale.1 1.2 1.3 1.4 1.5 1.6 4 3 2 1 0 s (MPa) l B Th=55 °C, t h=12s, W = 0.06 5 25 50 125 250 g (%/min) 1.0 1.1 1.2 1.3 1.4 1.5 1.6 4 3 2 1 0 s (MPa) l FIG. 5,jordan 2 bred.14 (Continued) Skin Biothermomechanics Th=65 °C, t h= 1 s, Ω = 1.44 0 1 2 3 4 5 s (MPa) 1.0 1.1 1.2 1.3 1.4 1.5 1.6 25 g (%/s) 50 125 l D Th=65 °C, t h= 3 s, Ω = 4.31 0 1 s (MPa) 2 3 4 5 1.0 1,buy real jordans cheap.1 1.2 1.3 1.4 1.5 1.6 25 g (%/min) 50 125 l FIG. 5.14 Stain-rate sensitivity at damage levels of (A) O . 0, (B) O . 0:06, (C) O . 1:44, and (D) O . 4:31,jordan 4 for sale. Th and th are heating temperature and duration, respectively. Chao et al., 2001) and bone (Mano, 2005; Yamashita et al,authentic retro jordans., 2002) have been studied in detail. T
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