Characterization of shape recovery via creeping and shape memory effect in ether-vinyl acetate copolymer (EVA)

Development of high shrinkage polyethylene terephthalate (PET) shape memory polymer tendons for concrete crack closure

“…It is also noted that other authors have suggested that the best way to compute Young's moduli is to use the slope of stress vs. strain response in the early unloading stages of each cycle. 25 The stress excursion of 10MPa (3 to 5% of the unheated tensile strengths) is greater than the values used in some previous studies 10 but the consistency of the results and linearity of the unloading-reloading cycle suggest that this stress change value was reasonable.…”

“…The same conclusions cannot be transferred to other polymers. 25 The work reported in this paper concentrated on peak shrinkage stresses but, as with all prestress systems, there will be some losses due to concrete creep and shrinkage, as well as relaxation of the tendons, although the latter losses are likely to be small for reasons explained above. The present system is targeted at closing early-age cracks and promoting the conditions for early-age autogenous healing; therefore, long-term losses are of secondary importance.…”

Shape memory effect and mechanical properties of cyanate ester-polybutadiene epoxy copolymer

“…Since the 1990s, SMPs have been increasingly developed and widely applied in smart textiles and apparels [11,12], intelligent medical devices [13][14][15], and self-deployable structures in spacecrafts [16][17][18][19][20].…”

Advanced Shape Memory Technology for Comfort Fitting

“…Such a shape recovery phenomenon is different from the shape change effect, in which a material responses to the applied stimulus in a linear or nonlinear manner with or without a hysteresis [10,11]. A higher energy barrier between the deformed shape, which is called the temporary shape, and the original shape, which is permanent, is the fundamental reason behind the shape memory effect [12,13].…”

“…So that it is not limited to shape memory alloys only, but all types of shape memory materials, even those conventional materials, such as many engineering polymers [13,15,16]; -The techniques to design/tailor the shape memory function of a material to meet the requirement(s) of a particular application [12]; -The techniques to optimize the shape memory performance [17].…”