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Ji, Wooseok
Composite Materials and Structures Lab
Research Interests
  • Mechanics of composites
  • In situ experiments
  • Fracture mechanics
  • Computational solid mechanics
  • Advanced finite element methods
  • Static and dynamic stability of structures

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On the Importance of Work-Conjugacy and Objective Stress Rates in Finite Deformation Incremental Finite Element Analysis

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Title
On the Importance of Work-Conjugacy and Objective Stress Rates in Finite Deformation Incremental Finite Element Analysis
Author
Ji, WooseokWaas, Anthony M.Bazant, Zdenek P.
Keywords
BODIES; STABILITY; SANDWICH
Issue Date
2013-07
Publisher
ASME-AMER SOC MECHANICAL ENG
Citation
JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME, v.80, no.4, pp.1 - 9
Abstract
This paper is concerned with two issues that arise in the finite element analysis of 3D solids. The first issue examines the objectivity of various stress rates that are adopted in incremental analysis of solids. In doing so, it is revealed that large errors are incurred by an improper choice of stress rate. An example problem is presented to show the implications of the choice of stress rate. The second issue addresses the need to maintain work-conjugacy in formulating and solving bifurcation buckling problems of 3D elastic solids. Four popular commercial codes are used to obtain buckling loads of an axially compressed thick sandwich panel, and it is shown that large errors in buckling load predictions are incurred as a result of violating the requirement of work-conjugacy. Remedies to fix the errors in the numerical solution strategy are given.
URI
https://scholarworks.unist.ac.kr/handle/201301/9565
DOI
10.1115/1.4007828
ISSN
0021-8936
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