Finite Element Analysis Of Composite Materials

Taig, I C

First Published - 1992
Softback - 73 Pages

This review is carried out in accordance with the requirements of the Specification set out in a document “Composite Structures by F.E Analysis” prepared by the NAFEMS General Technology Working Group, dated April 6th 1989 updated by the Statement of Interest submitted by ITET, Aug 7 th 1989 and a letter from Prof. G.A.O Davies dated Sept 28 th 1989.The aims are restated below: -

• • To review the needs of a composite pre-processing package whether this be self-contained or embedded/coupled with an existing commercial F.E. code. The needs should include assembly of material stiffness properties for specific elements from data supplied by a user in terms of all lamina properties, including stacking sequence. Attention should be paid to material -, laminate- and element- local / global orientations.
    
  • To address the various fibre and matrix failure criteria needed, including through-thickness effects with direct stresses and interlaminar shears. Special elements or routines may be needed for local features where the three dimensional effects are significant.
    
  • To assess the capability of codes claiming to have composite features, with respect to items 1 and 2 above; to address user friendly features in interfacing with main F.E. programs and displaying results, whether with or without a commercial postprocessor.
    
  • To highlight weaknesses in codes either via a checklist or by quantitatively descriptive summaries if these weaknesses are common or generic. The checklist should be publishable, with codes named.
    
  • If important features are identified, to propose a few benchmarks and to try these out on one code. Benchmark presentations should aim to follow single page formats adopted by NAFEMS in the past issues of “Benchmark”.
    
  • To identify whether codes have local UK support in addition to supply of documentation. Features of codes necessary for any F.E. analysis are not to be reviewed: only the special composite features, including special elements such as sandwich plates.

CONTENTS

1. Introduction & Restatement of aims

2. Systems Reviewed (in categories)

3. Engineers’ Requirements for Composite Analysis

• 3.1 Overview
• 3.2 Material Representation
• 3.3 Geometry and Topology
• 3.4 Modelling and Element Formulation
• 3.5 Solution Capabilities
• 3.6 Stress and Strain Recovery
• 3.7 Failure Assessment

4. Review of Systems’ Capabilities

• 4.1 Physical Representation and Pre-processing
• 4.2 Analytical Modelling and Solution
• 4.3 Results Recovery and Post-processing

5. Simple Tests for System Capability and Performance

• 5.1 Description and Aims or Proposed Tests
• 5.2 Some Test Results and Comments
• 5.3 Suggestions for NAFEMS Benchmarks

6. Proposed Extension of Task

• 6.1 Completion of Test Reporting
• 6.2 Benchmark Development

7. Summary and Conclusions

8. Acknowledgements

9. References