G0100201 Deformation theory and stress analysis for kink structure based on disclination dipole

Abstract

Kink deformation bands appearing in compressed specimens of Mg alloy with long-period stacking ordered structure (LPSO) are thought to contribute to improving their mechanical properties. Accordion kink (AK) is considered as the main body of ridge-shaped kink structure (RSKS) which has been observed in layered solids such as metal alloy, muscovite aggregate, geological strata and so on. In this work, we will build mechanical analysis model of AK in finite body based on disclination dipoles in simply-supported boundary condition, and solve the boundary value problem using the approach. The influence of the interval of AK to the stress field in finite body will be discussed in details. The relationship between energy (including strain energy and boundary energy) and intervals of AK will be calculated. The simulation results show that with the extending of intervals of AK, the strain energy increases monotonically. Meanwhile the total area of kink boundary decreases, which effect the variety of boundary energy obviously.