Characterizing the shape memory effect potential of NiTi alloys

Edwards, G.R.; Perkins, Jeff; Johnson, John M.

doi:10.1016/0036-9748(75)90400-7

Cited by 17 publications

(10 citation statements)

References 4 publications

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“…These features are in agreement with the experimental observations [5,6]. Experimental work is now in progress in order to compare the measured and predicted values of the recovery stresses developed by a Ni-Ti alloy.…”

Section: Vhtp(t) = 1--exp --K (T--as)supporting

confidence: 87%

“…There have been a few investigations dealing with experimental measurements of the recovery stresses developed by Ni-Ti alloy near the equi-atomic composition [5,6]. In evaluating the performance of a particular alloy in such devices it becomes essential to determine the levels of recovery stresses?…”

Section: Determination Of the Recovery Stresses Developed By Shape Mementioning

confidence: 99%

“…There have been a few investigations dealing with experimental measurements of the recovery stresses developed by Ni-Ti alloy near the equi-atomic composition [5,6]. The memory effect is demonstrated by inducing a macroscopic strain within a certain range in a specimen while in the martensitic state, and then heating to revert martensite to the high temperature phase (HTP).…”

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confidence: 99%

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Determination of the recovery stresses developed by shape memory alloys

Mohamed¹

1978

J Mater Sci

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Section: Vhtp(t) = 1--exp --K (T--as)supporting

confidence: 87%

Section: Determination Of the Recovery Stresses Developed By Shape Mementioning

confidence: 99%

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confidence: 99%

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Determination of the recovery stresses developed by shape memory alloys

Mohamed¹

1978

J Mater Sci

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“…When the temperature was higher than A s , TiNi f that was constrained by the Al matrix went back to its original shape. The recovery stress of TiNi f rose with the increase in temperature [26] . Thus, the increase of compressive stress induced the change in the thermal expansion behavior of the composite.…”

Section: Effect Of Prestrain On the Damping Capacity Of The Sic P + Tmentioning

confidence: 97%

Damping capacity of the Al matrix composite reinforced with SiC particle and TiNi fiber

Wu²,

Zhang

et al. 2016

Science and Engineering of Composite Materials

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Imitating the structure of steel-reinforced concrete, a composite coupling good damping capacity and mechanical property was fabricated by pressure infiltration progress. The aluminum (Al) matrix composite was hybrid reinforced by 20% volume fraction of SiC particle (SiC p ) and 20% volume fraction of TiNi fiber (TiNi f ). The damping capacity of the composite in the temperature range from 30 ° C to 290 ° C was studied using a dynamic mechanical analyzer (DMA). Due to the B19 ′ → B 2 reverse martensitic transformation in TiNi f , a damping peak showed up in the heating process. Furthermore, both the hysteretic effect of the martensite/variants interfaces in TiNi f and the weak bonding interface between SiC p and TiNi f were attributed to the high damping capacity of the composite. After tension deformation, a compressive stress was formed in the composite in the heating process. With the help of compressive stress, the value of the damping peak was much higher than before, since the movement of dislocation in the Al matrix was easier.

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“…Dynamic stressing can be carried at constant temperature and strain rate [58] (as for the usual stress-strain curve) or at constant strain during thermal cycling [81]. Dynamic stresses can be introduced also an an unavoidable consequence of an experimental procedure, as in internal friction measurements [65].…”

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confidence: 99%

The transformation strain dependence on applied stress in equiatomic nickel-titanium alloys of powder metallurgical origin

Ramon

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INFORMATION TO USERSThis reproduction was made from a copy of a document sent to us for microfilming. While the most advanced technology has been used to photograph and reproduce this document, the quality of the reproduction is heavily dependent upon the quality of the material submitted.The following explanation of techniques is provided to help clarify markings or notations which may appear on this reproduction. 1.The sign or "target" for pages apparently lacking from the document photographed is "Missing Page(s)". If it was possible to obtain the missing page(s) or section, they are spliced into the film along with adjacent pages. This may have necessitated cutting through an image and duplicating adjacent pages to assure complete continuity.2. When an image on the film is obliterated with a round black mark, it is an indication of either blurred copy because of movement during exposure, duplicate copy, or copyrighted materials that should not have been filmed. For blurred pages, a good image of the page can be found in the adjacent frame. If copyrighted materials were deleted, a target note will appear listing the pages in the adjacent frame.3. When a map, drawing or chart, etc., is part of the material being photographed, a definite method of "sectioning" the material has been followed. It is customary to begin filming at the upper left hand comer of a large sheet and to continue from left to right in equal sections with small overlaps. If necessary, sectioning is continued again-beginning below the first row and continuing on until complete. In all cases this material has been filmed in the best possible way from the available copy. Problems encountered with this document have been identified here with a check mark V . 1.Glossy Signature was redacted for privacy.Signature was redacted for privacy.Signature was redacted for privacy. (1) and (2) for the The tubular samples were cycled in temperature by circulating pre heated or precooled silicone oil through them. At the same time, they were held in grips, which permitted a deadweight axial stress to be applied. Rosette-type strain gages were used to measure axial, circum ferential, and 45°-inclined strains continuously as a function of temper ature. The strain-temperature hysteresis loops were analyzed for the dependence of their shape (including magnitude and direction of trans formation strain) on the type (tensile or compressive) and magnitude of the applied stress. Furthermore, the difference in behavior for Ni-Ti in the as-fabricated and annealed conditions was studied. In the absence of an applied stress, the strains upon transformation were nearly isotropic, and a net expansion took place upon transformation on cooling. By con trast, as the uniaxial tensile stress was increased, the axial and cir cumferential strains became increasingly different, i.e., the axial strain corresponded to an expansion upon transformation on cooling and the circumferential strain to a contraction. The magnitudes of these strains increased progressively with increasing...

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Characterizing the shape memory effect potential of NiTi alloys

Cited by 17 publications

References 4 publications

Determination of the recovery stresses developed by shape memory alloys

Determination of the recovery stresses developed by shape memory alloys

Damping capacity of the Al matrix composite reinforced with SiC particle and TiNi fiber

The transformation strain dependence on applied stress in equiatomic nickel-titanium alloys of powder metallurgical origin

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