Epithelia are planar tissues that undergo major morphogenetic movements during development. These movements must work in the context of the mechanical properties of epithelia. Surprisingly little is known about these mechanical properties at the time and length scales of morphogenetic processes. We show that at a time scale of hours, Xenopus gastrula ectodermal epithelium mimics an elastic soli...

Abstract Background The resonant-frequency-tunable vibration isolator based on Shape Memory Alloys (SMAs) combines the priority of passive and active isolators, expands its engineering application, improves efficiency isolation. However, special characteristics SMAs complexity result in difficulty finite-element analysis. Methods This article employs ABAQUS subroutine presents analysis for this...

The pseudoelastic responses of heat-treated CoNiAl single crystals with [001] and [115] orientations, multicrystals of nominally [123] orientation, and polycrystals are investigated under tension and compression stress states. The highest transformation strains are found under pseudoelasticity for the [001] orientation in tension and compression as 6.2% and 4.1% respectively. Experiments reveal...

Based on the experimental results and the finite element analysis, a constitutive model is proposed for two phase shape memory alloys by introducing a compensative volumetric strain into a constrained relationship between the two phases, accounting for the reduced constraint due to the growth of martensite band. The pseudoelasticity of NiTi shape memory alloy micro-tube, subjected to pure tensi...

The paper reviews the unique metallurgical features, corrosion resistance and biocompatibility of a beta TiMo based alloy for assessing its potentials as a biomaterial. TiMo based alloys at critical beta stability exhibit nonlinear pseudoelasticity. These alloys in cold worked condition also exhibit greatly extended linear elasticity and a low modulus much more closely matching those of human h...

Magnetic shape memory properties of Ni-Mn-Ga single crystals were characterized by measurement of stress-induced martensite reorientation under constant magnetic fields. Also magnetic field-induced strain as a function of the applied magnetic field under different constant compressive stress levels has been investigated. All the experiments were performed at room temperature in which the sample...

Some shape memory alloys like NiTi show noticeable high damping property inpseudoelastic range. Due to its unique characteristics, a NiTi alloy is commonly used forpassive damping applications, in which the energy may be dissipated by the conversion frommechanical to thermal energy. This study presents a shape memory alloy based micro-damper, which exploits the pseudoelasticity of NiTi wires fo...

The excellent pseudoelasticity, shape memory and biocompatibility of Nitinol has made it a leading candidate for various applications, including aerospace, micro-electronics and medical devices. Challenges associated with the welding Nitinol need to be resolved before its full potential in practical applications can be attained. The current study details the effects of process parameters on the...