Pracownicy

Streszczenie:
Needle-like twins are observed experimentally within the transition layer at the martensite–twinned martensite interface. We utilize a phase-field approach to investigate this microstructure. Our goal is to simulate the morphology of the transition layer and to perform a detailed analysis to characterize its interfacial and elastic micro-strain energy. To illustrate the micromechanical framework developed for that purpose, sample computations are carried out for a CuAlNi shape memory alloy undergoing a cubic-to-orthorhombic martensitic transformation. A particular focus of the study is on size-dependent morphology through examining the impact of twin spacing. Additionally, our results reveal that certain twin volume fractions lead to the emergence of twin branching as a way to minimize the total free energy stored in the microstructure.

Słowa kluczowe:
Microstructure,Martensitic transformation,Transition layer,Phase-field method,Size effects

Streszczenie:
In this comment, it is shown that there are some non-negligible big mistakes in the analyses and stability proof of the proposed controller in the quoted paper, which makes the main results of this paper to be incorrect. The main unavoidable mistakes in the stability analysis of the main theorem (Theorem 1) are stated and some remarks are also mentioned to fix some of them.

Słowa kluczowe:
finite-time convergence, fractional-order controllers, lower-limb exoskeleton, robustadaptive control, terminal sliding mode control

Słowa kluczowe:
Shape memory alloys, Branched microstructures, Energy minimization, Continuum framework

Słowa kluczowe:
shape memory alloys, branched microstructures, free energy, continuum model

Słowa kluczowe:
microstructure, martensitic phase transformation, transition layer, phase-field method, size effects