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Title: Global/local finite element analysis for textile composites

Abstract

Conventional analysis of textile composites is impractical because of the complex microstructure. Global/local methodology combined with special macro elements is proposed herein as a practical alternative. Initial tests showed dramatic reductions in the computational effort with only small loss in accuracy. 9 refs.

Authors:
;
Publication Date:
OSTI Identifier:
6237745
Report Number(s):
AIAA-Paper--93-1506; CONF-9304186--
CNN: NAG3-1270; NAG1-1324
Resource Type:
Conference
Resource Relation:
Conference: 34. American Institute of Aeronautics and Astronautics/American Society of Mechanical Engineers (AIAA/ASME) adaptive structures conference, La Jolla, CA (United States), 19-22 Apr 1993; Other Information: 1721-1731
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; COMPOSITE MATERIALS; IMPACT STRENGTH; STRESS ANALYSIS; FINITE ELEMENT METHOD; IMPACT SHOCK; MICROSTRUCTURE; TEXTILES; CALCULATION METHODS; MATERIALS; MECHANICAL PROPERTIES; NUMERICAL SOLUTION 360603* -- Materials-- Properties

Citation Formats

Woo, K., and Whitcomb, J. Global/local finite element analysis for textile composites. United States: N. p., 1993. Web.
Woo, K., & Whitcomb, J. Global/local finite element analysis for textile composites. United States.
Woo, K., and Whitcomb, J. 1993. "Global/local finite element analysis for textile composites". United States. doi:.
@article{osti_6237745,
title = {Global/local finite element analysis for textile composites},
author = {Woo, K. and Whitcomb, J.},
abstractNote = {Conventional analysis of textile composites is impractical because of the complex microstructure. Global/local methodology combined with special macro elements is proposed herein as a practical alternative. Initial tests showed dramatic reductions in the computational effort with only small loss in accuracy. 9 refs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1993,
month = 1
}

Conference:
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  • Textile composites are known to have improved out-of-plane properties and impact resistance. However, detailed analysis of textile composites is very difficult to perform due to the geometric complexity. In the present study, a practical computational procedure based on a global/local finite element method was developed for detailed analysis of textile composites. This procedure utilizes two problem levels: global and local levels. At the global level, an initial solution was obtained using a coarse global mesh. At the local level, a small portion of the textile composite was refined in a local mesh and analyzed in a great detail. In thismore » study, single-field and multi-field macro elements were used in the global analysis. The macro elements are defined herein to be elements with microstructure within each element. Both the conventional finite element method and the global/local finite element method with macro elements were used to study the variation of effective properties and failure behavior of plain weave and satin weave textile composites. Results indicated that the global/local procedure was very efficient for the detailed analysis of the textile composites. The use of macro elements in the global mesh predicted the global response well and the detailed local stress distribution was obtained by the refined local mesh with discrete material modeling. With a small loss of accuracy, the global/local procedure was able to provide a reasonable solution where the conventional finite element analysis was not possible due to huge computer resource requirements. The effective properties of plain weave and satin weave textile composites were dependent on waviness. The effective properties also showed strong dependency on the number of layers. Quick convergence was obtained, however, as the number of layers increased. The stress and failure index distribution of thin plain weave textile composites were different from that of thick plain weave textile composites.« less
  • The proposed micromechanical damage composite model used here is such that separate local constitutive damage relations are used for each of the matrix and the fiber. This is coupled with the interfacial damage between the matrix and the fiber exclusively. The damage relations are linked to the overall response through a certain homogenization procedure. The elasto-plastic stiffness tensor is derived for the damaged composite. Numerical solutions are obtained using the finite element method for the proposed theory for two types of laminate layups (0/90){sub s} and ({+-} 45){sub s} each consisting of four plies and compared with experimental results. Amore » very good correlation is obtained between the experimental and numerical results. In addition to the damage evolution, the development of plastic zones and the stress-strain response are shown for the two types of laminated layups.« less
  • The development of layered finite elements has facilitated analysis of laminated composite structures. However, the analysis of a structure containing both isotropic and composite materials remains a difficult problem. A methodology has been developed to conduct a global-local'' finite element analysis. A global'' analysis of the entire structure is conducted at the appropriate loads with the composite portions replaced with an orthotropic material of equivalent materials properties. A local'' layered composite analysis is then conducted on the region of interest. The displacement results from the global'' analysis are used as loads to the local'' analysis. the laminate stresses and strainsmore » can then be examined and failure criteria evaluated.« less
  • The development of layered finite elements has facilitated analysis of laminated composite structures. However, the analysis of a structure containing both isotropic and composite materials remains a difficult problem. A methodology has been developed to conduct a ``global-local`` finite element analysis. A ``global`` analysis of the entire structure is conducted at the appropriate loads with the composite portions replaced with an orthotropic material of equivalent materials properties. A ``local`` layered composite analysis is then conducted on the region of interest. The displacement results from the ``global`` analysis are used as loads to the ``local`` analysis. the laminate stresses and strainsmore » can then be examined and failure criteria evaluated.« less
  • A new delaminated beam element is presented for the global analysis of laminated beams containing delaminations. The principal advantage of the element is that it allows for modeling of delaminations anywhere in the structure using a single finite element model. Therefore, it is expected to be useful for predicting delamination growth in a structure. In the current work, development of the element is presented and evaluation of its performance for static and modal analysis is considered.