ANALYSIS OF VICKERS HARDNESS BY THE FINITE-ELEMENT METHOD

Citation
Y. Murakami et K. Matsuda, ANALYSIS OF VICKERS HARDNESS BY THE FINITE-ELEMENT METHOD, Journal of applied mechanics, 61(4), 1994, pp. 822-828
Citations number
25
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Mechanics
ISSN journal
0021-8936
Volume
61
Issue
4
Year of publication
1994
Pages
822 - 828
Database
ISI
SICI code
0021-8936(1994)61:4<822:AOVHBT>2.0.ZU;2-W
Abstract
A particular formulation of the three-dimensional finite element metho d specifically for analyzing the Vickers hardness test is established. The Vickers hardness of 0.46 percent carbon steel and 70/30 brass is calculated using the proposed method using the stress-strain curve obt ained from a tensile test. The calculated values correlate well with t he experimental results for 0.46 percent steel and 70/30 brass. In add ition, the analysis predicts the extension of the plastic zone induced by indentation, the stresses at the maximum load, and the residual st resses present after complete removal of the load. At the maximum load there are no tensile stresses in the vicinity of the indenter. Howeve r, after removal of the load, large tensile residual stresses are pres ent on the diagonal edge beneath the indentation in the direction perp endicular to the diagonal edge. These results imply that it is necessa ry to reconsider the accuracy and validity of the conventional indenta tion method used for the determination of K-Ic for brittle materials s uch as ceramics.