This Article Full Text (PDF) All Versions of this Article: 1056789508090748v1 18/6/507    most recent References Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Alert me to new issues of the journal Add to Saved Citations Download to citation manager Request Permissions Request Reprints Add to My Marked Citations Citing Articles Citing Articles via Scopus Google Scholar Articles by Zhao, A.H. Articles by Chow, C.L. Social Bookmarking                         What's this?

Computational Algorithms for a Damage-coupled Cyclic Viscoplasticity Material Model

Department of Mechanical Engineering, University of Michigan-Dearborn, Dearborn, MI 48128, USA, aihongzhao{at}yahoo.com

C.L. Chow

Department of Mechanical Engineering, University of Michigan-Dearborn, Dearborn, MI 48128, USA

The primary objective of this investigation is to develop efficient and robust computational schemes for a damage-coupled cyclic thermoviscoplasticity model for solder materials. Three constitutive integration algorithms, Euler, modified Euler, and semi-implicit algorithm for the model are examined. The three algorithms for the model are coded in the commercial finite element (FE) code ABAQUS (version 6.21) via its user-defined material subroutine UMAT. Two single-step algorithms of the substep scheme are applied for the modified Euler algorithm to control the error in the integration of constitutive laws. A semi-empirical formulation is established for an adaptive time stepping algorithm that is based on the Euler algorithm. The simulations of single-element, miniature specimen and notched specimen simulations have been conducted and compared with the test results under monotonic tensile, creep, and fatigue tests of 63Sn-37Pb solder. It is observed that the explicit algorithm consistently requires much less CPU time than others. The modified Euler algorithm has shown, on the other hand, to be not only efficient but also accurate. The semi-implicit algorithm yields an accurate solution. It is worth noting that the method is also effective by applying an appropriate integration scheme.

Key Words: thermoviscoplasticity • damage mechanics • solder • finite element • computational algorithm.

This version was published on August 1, 2009

International Journal of Damage Mechanics, Vol. 18, No. 6, 507-532 (2009)
DOI: 10.1177/1056789508090748


CiteULike    Complore    Connotea    Del.icio.us    Digg    Reddit    Technorati    Twitter    What's this?