[논문]A Study of Deformation and Orientation Dependent Behavior in Single Crystals

Yang Chulho

doi:10.1007/bf02916128

[국내논문] A Study of Deformation and Orientation Dependent Behavior in Single Crystals 원문보기

Journal of mechanical science and technology, v.19 no.3, 2005년, pp.802 - 810

Yang Chulho (School of Mechanical Engineering, Andong National University)

Abstract ▼ AI-Helper

Deformations of single crystals were studied using finite element analysis to investigate the localized modes and the orientation dependence of plastic deformation observed in single crystals. Investigation of mechanical properties of single crystals is closely related with the understanding of deformation processes in single crystals. Localized bands such as shear and kink were studied and the material and geometric characteristics that influence the formation of such localized bands were investigated. Orientation dependence of material behavior in NiAl single crystals was studied by rotating slip directions from 'hard' orientation. The maximum nominal compressed stress in NiAl single crystals was widely ranged depending on the misalignment from 'hard' orientation. As the compression axis was set closer to 'hard' orientation, the maximum nominal compressed stress was rapidly increased and made slips difficult to activate. Therefore, non- slips will be activated instead of slips for 'hard' orientation.

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제안 방법

In this paper, the conditions that lead to shear localization, as well as the constitutive parameters that play a significant role were studied by nu merical simulations. Simulations were performed with varying values of constitutive parameter, specimen geometry, orientation and boundary conditions.
simulations. Simulations were performed with varying values of constitutive parameter, specimen geometry, orientation and boundary conditions.

이론/모형

In section 2, the kinematics and constitutive model for single crystals are reviewed. These theoretical formulations have been implemented into UMAT (user material subroutine) in ABAQUS, a commercial finite element code that is capable of modeling large deformation and large strains, to study the various deformation processes in single crystals in sections 3 and 4. The orientation dependence of mechanical properties of single crystals is studied in section 4.

참고문헌 (24)

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