VOID GROWTH AND FAILURE IN NOTCHED BARS Academic Article

abstract

• Void growth and ductile failure in the nonuniform multiaxial stress fields of notched bars are studied numerically and experimentally. U-notched bars with different notch acuities are made from partially consolidated and sintered iron powder compacts with various residual porosities. The materials are modelled using an elastic-viscoplastic constitutive relation that accounts for strength degradation resulting from the growth of microvoids. The matrix stress-strain relation and the initial void volume fractions used in the calculations are determined experimentally. The remaining parameters in the constitutive equations are evaluated from micromechanical models. Comparisons of the calculations with experimental results indicate that the constitutive model can provide good estimates of the evolution of the void volume fraction and of the strength reduction induced by void growth under a variety of nonuniform stress histories. 1988.

authors

• Needleman, Alan

published proceedings

• JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS

author list (cited authors)

• BECKER, R., NEEDLEMAN, A., RICHMOND, O., & TVERGAARD, V.

citation count

• 185

complete list of authors

• BECKER, R||NEEDLEMAN, A||RICHMOND, O||TVERGAARD, V

publication date

• January 1988

publisher

• Elsevier  Publisher

published in

• Journal of the Mechanics and Physics of Solids  Journal

Digital Object Identifier (DOI)

• 10.1016/0022-5096(88)90014-2

start page

• 317

end page

• &

volume

• 36

issue

• 3

URL

• http%3A%2F%2Fdx.doi.org%2F10.1016%2F0022-5096%2888%2990014-2