Two Way Shape Memory Effect (TWSME) involves thermomechanical routines which produce some plastic deformation or complex dislocation arrays during the training procedure. The results of TWSME obtained by these thermomechanical training routines are not as good as would be expected because new dislocations are generated during thermal cycling. These dislocations may interact with those that prov...

Stabilization of martensite and two way shape memory effect (TWSME) was studied in Cu-Ai-Mn alloys containing 9.7-11.8 wt% Al, and 3.0-9.25 wt% Mn, which were quenched to various temperatures. The transforming temperatures were in the range -70 to +220°C. The majority of alloys quenched directly to martensite did not show reverse transformation on heating due to stabilization and further temper...

Today's medical technology makes it possible to increase leg length for people with leg length discrepancies or excessively short limbs. With the Ilizarov method bones can be gradually elongated (max. Immlday) without implantation of bone grafts or multiple operations. Although the operative procedure is relatively simple, the negative side effects for the patient are considerable. An external ...

The 4D-printable two-way shape memory effect (TWSME) is not well known to building engineering and architecture. To better understand the thermo-mechanical complexity of TWSME in skin design, this paper investigates parametric uncertainty basic deformation a rectangular façade surface module. end, 4D-printed composite was prototyped by 3D-printing polymer (SMP, digital elastomers DM9850 9885) d...

The influence of the martensitic, martensitic+austenitic and austenitic structures in bending training on two-way shape memory effect (TWSME) in Ni-50.8 at %Ti and Ni-49.9 at %Ti alloys was studied. In addition of the primary structure, the effect of pre-strain, plastic strain, training cycle and training temperature on the TWSME was investigated. The prepared samples were trained in martensiti...

This work presents a three-dimensional constitutive model for shape memory alloys considering the TRansformation-Induced Plasticity (TRIP) as well Two-Way Shape Memory Effect (TWSME) through large deformation framework. The presented logarithmic strain based is able to capture strains and rotations exhibited by SMAs under general thermomechanical cycling. By using martensitic volume fraction, t...

In the current paper, a predefined thermomechanical procedure has been applied to two-way shape memory effect (TWSME) in NiTi alloy study of two different load conditions on induced martensitic state. The microstructure strips was studied using optical microscopy (OM), scanning electron (SEM) fitted with an EDS microprobe, and microhardness tests at end both training thermal cycles. Inducing in...

The two way shape memory e f f e c t (TWSME) is u s u a l l y induced by t h e p r e s e n c e of e i t h e r s t a b i l i z e d t h i n p l a t e s of m a r t e n s i t e o r p a r t i c u l a r d e f e c t s b r e a k i n g t h e symmetry of t h e p a r e n t phase and making o n l y one o r a few v a r i a n t s f a v o u r a b l e upon t r a n s f o r m a t i o n . G e n e r a l l y , t h ...