Numerical considerations for the implementation of a comprehensive composite damage model

Louis N. S Chiu, Brian G. Falzon, Bernard Chen, Wenyi Yan

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

Abstract

A comprehensive continuum damage mechanics model [1] had been developed to capture the detailed behaviour of a composite structure under a crushing load. This paper explores some of the difficulties encountered in the implementation of this model and their mitigation. The use of reduced integration element and a strain softening model both negatively affect the accuracy and stability of the simulation. Damage localisation effects demanded an accurate measure of characteristic length. A robust algorithm for determining the characteristic length was implemented. Testing showed that this algorithm produced marked improvements over the use of the default characteristic length provided by Abaqus. Zero-energy or hourglass modes, in reduced integration elements, led to reduced resistance to bending. This was compounded by the strain softening model, which led to the formation of elements with little resistance to deformation that could invert if left unchecked. It was shown, through benchmark testing, that by deleting elements with excess distortions and controlling the mesh using inbuilt distortion/hourglass controls, these issues can be alleviated. These techniques contributed significantly to the viability and usability of the damage model.
Original languageEnglish
Title of host publicationAdvances of Computational Mechanics in Australia
EditorsYuantong Gu, Hong Guan, Emilie Sauret, Suvash Saha, Haifei Zhan, Rodney Persky
Place of PublicationPfaffikon Switzerland
PublisherTrans Tech Publications
Pages217-224
Number of pages8
ISBN (Print)9783038355281
DOIs
Publication statusPublished - 25 Jul 2016
EventAustralasian Conference on Computational Mechanics 2015 - Brisbane, Australia
Duration: 30 Nov 20151 Dec 2015
Conference number: 2nd
https://accm2015.lamses.org/
https://www.scientific.net/AMM.846.-5.pdf (Preface)

Publication series

NameApplied Mechanics and Materials
PublisherTrans Tech Publications
Volume846
ISSN (Print)1660-9336
ISSN (Electronic)1662-7482

Conference

ConferenceAustralasian Conference on Computational Mechanics 2015
Abbreviated titleACCM 2015
CountryAustralia
CityBrisbane
Period30/11/151/12/15
Internet address

Keywords

  • Composite Damage
  • Nonlinear Finite Element

Cite this