NUMERICAL AND EXPERIMENTAL STUDIES OF DEEP INDENTATION ON SINGLE CRYSTALS

作者：Gan Yong X^*; Chen Xi; Zhao Manhong

来源：Journal of Mechanics of Materials and Structures, 2008, 3(8): 1429-1445.

DOI：10.2140/jomms.2008.3.1429

• finite element simulation
• indentation
• plastic deformation
• copper crystal
• stress field
• shear strain
• electron backscatter diffraction
• crystal lattice rotation
• slip
• dislocation structure

Indentation tests with large penetration depths have been used to study the plastic deformation behavior of materials. In this work, finite element simulations of wedge indentation into face-centered cubic single crystals were performed. Numerical solutions to the stresses and shear strains within the single crystals indented with a relatively large penetration depth were obtained. The crystal lattice rotation map of the indented crystals was also shown. Indentation experiments were conducted on copper crystals and the results were used to validate the numerical predictions. Comparison of the numerical solutions to the crystal lattice rotation with the experimentally measured lattice rotation map was made. The main features of the crystal lattice in-plane rotation map from the finite element simulations are also found on the map developed from the electron backscatter diffraction measurements. Both simulations and experimental measurements reveal the same dislocation structures as evidenced by the slip sectors underneath the wedge indentation zone.

• 出版日期2008-10