Community Research and Development Information Service - CORDIS


Robinson's viscoplastic model has been implemented into ABAQUS using the user sub-routine UMAT. For the time integration, the generalised midpoint rule has been applied. The solution of the nonlinear system of algebraic equations arising from time discretisation of the constitutive equations is determined using a projection method in combination with Newton's method. The tangent moduli are calculated consistently with the applied integration algorithm. The efficiency of the algorithm is demonstrated discussing various numerical examples, e.g. a transient thermal load case and the problem of stationary crack in a creeping solid.

Additional information

Authors: HORNBERGER K, Kernfornschungszentrum Karlsruhe (DE);STAMM H, JRC Ispra Estab. (IT)
Bibliographic Reference: Paper presented: ABAQUS Users' Meeting, Stresa (IT), May 24-26, 1989
Availability: Available from (1) as Paper EN 34698 ORA
Record Number: 198910570 / Last updated on: 1994-12-01
Original language: en
Available languages: en