Rate Dependent Multicontinuum Progressive Failure Analysis of Woven Fabric Composite Structures under Dynamic ImpactReportar como inadecuado




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Shock and Vibration - Volume 11 2004, Issue 2, Pages 103-117



Applied Mechanics Department, System Engineering Group Anteon Corporation, Mystic, CT, USA

Department of Mechanical Engineering, University of Wyoming, Laramie, Wyoming 82071, USA

Received 18 June 2003; Accepted 7 November 2003

Copyright © 2004 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Marine composite materials typically exhibit significant rate dependent response characteristics when subjected to extreme dynamic loading conditions. In this work, a strain-rate dependent continuum damage model is incorporated with multicontinuum technology MCT to predict damage and failure progression for composite material structures. MCT treats the constituents of a woven fabric composite as separate but linked continua, thereby allowing a designer to extract constituent stress-strain information in a structural analysis. The MCT algorithm and material damage model are numerically implemented with the explicit finite element code LS-DYNA3D via a user-defined material model umat. The effects of the strain-rate hardening model are demonstrated through both simple single element analyses for woven fabric composites and also structural level impact simulations of a composite panel subjected to various impact conditions. Progressive damage at the constituent level is monitored throughout the loading. The results qualitatively illustrate the value of rate dependent material models for marine composite materials under extreme dynamic loading conditions.





Autor: James Lua, Christopher T. Key, Shane C. Schumacher, and Andrew C. Hansen

Fuente: https://www.hindawi.com/



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