By M. Fremond, S. Miyazaki (auth.)
This booklet involves chapters. the 1st bankruptcy bargains with the thermomechanical macroscopic conception describing the transformation and deformation habit of form reminiscence alloys. the second one bankruptcy bargains with the huge and basic overview of the experimental works which come with crystallography, modifications and mechanical features in Ti-Ni, Cu-base and ferrous form reminiscence alloys.
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This ebook includes chapters. the 1st bankruptcy bargains with the thermomechanical macroscopic concept describing the transformation and deformation habit of form reminiscence alloys. the second one bankruptcy bargains with the broad and primary overview of the experimental works which come with crystallography, ameliorations and mechanical features in Ti-Ni, Cu-base and ferrous form reminiscence alloys.
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Additional resources for Shape Memory Alloys
1·tes . (45) 1mp . h respect to the -0 ~i . Because reIat10n . . wtt dJSstpatJOn ot 0~3 -=- ot 0~1 0~2 ot ot · we can eliminate the velocity 0p3 in the constitutive laws. As we have already mentionned. we can ot also define directly the dissipative internal forces. We choose this way and define a pseudopotential of dissipation, 35 A Thermomechanical Macroscopic Theory (50), ()~10~2 1
If the temperature is again increased the alloys goes back to the state (cr =0, E =0) and so on (figure 29). The alloys remembers two shapes: the state Er+(E = 0, cr = 0, ~3 = 1, T+) and the state Er-(E = Ez, cr = 0, p1 = 1, T-) ! One at high temperature and an other one at low temperature. The heat ~Q which is received from the exterior during the phase change, for instance when going from E- foE+, is As we expect, it is positive because T- ~ Tc. M. mond 58 / cr / / / / / / / Figure 29 The two shape memory effect.
0 Figure 14 In the first experiment the applied deformation e(t) increases from 0 and decreases till the stress cr(t) is zero. In the second experiment the applied deformation e(t) (dotted line) increases to a larger value, then decreases till the stress cr(t) is zero. In the second experiment, the deformation increases to a larger value then decreases again to a value such that the stress is zero (figure 14). In the last experiment, the deformation starting from 0 increases. P2) is Pro= <1.
Shape Memory Alloys by M. Fremond, S. Miyazaki (auth.)